chapter 11 bonding and molecular structure: chapter 11 bonding and molecular structure: organic...
TRANSCRIPT
CHAPTER 11CHAPTER 11BONDING AND MOLECULAR BONDING AND MOLECULAR
STRUCTURE:STRUCTURE:
ORGANIC CHEMISTRYORGANIC CHEMISTRYAll bold numbered problemsAll bold numbered problems..
OverviewOverview• Organic chemistry is the study of Organic chemistry is the study of
compounds containing carbon combined compounds containing carbon combined with other non-metals. with other non-metals.
• Bonding plays a critical role in Bonding plays a critical role in understanding the reactivity of these understanding the reactivity of these compounds. compounds.
• These compounds are referred to as These compounds are referred to as hydrocarbons since they are primarily hydrocarbons since they are primarily hydrogen and carbon. hydrogen and carbon.
OverviewOverview
OverviewOverview• Carbon uses spCarbon uses sp33, sp, sp22, and sp , and sp
hybridization in forming the four hybridization in forming the four bonds per carbon atom common to bonds per carbon atom common to almost all carbon compounds. almost all carbon compounds.
• With sp hybridization, there are two With sp hybridization, there are two (2) (2) bonds and 2 bonds and 2 bonds. bonds.
• With spWith sp22 hybridization there is one (1) hybridization there is one (1) bond and 3 bond and 3 bonds. bonds.
Why CarbonWhy Carbon
sp3, sp2, and sp hybridizationsp3, sp2, and sp hybridization
Allotropes of CarbonAllotropes of Carbon
Carbon onlyCarbon only(no other atom) compounds(no other atom) compounds
FUNCTIONAL GROUPSFUNCTIONAL GROUPS1.1. AlkaneAlkane2.2. AlkeneAlkene3.3. AlkyneAlkyne4.4. Alkyl halideAlkyl halide5.5. AromaticAromatic6.6. AlcoholAlcohol7.7. AldehydeAldehyde8.8. KetoneKetone9.9. Carboxylic AcidCarboxylic Acid10.10. EsterEster11.11. AmineAmine12.12. AmideAmide
Organic chemistry is the study of Organic chemistry is the study of compounds containing carbon.compounds containing carbon. The goal of studying Organic The goal of studying Organic chemistry is the making of chemistry is the making of carbon-carbon bonds, C-X, C-O, C-N,carbon-carbon bonds, C-X, C-O, C-N,and C-S bonds to make new moleculesand C-S bonds to make new molecules
Inorganic molecules like CO, andInorganic molecules like CO, and COCO33
-2-2 are not considered organic are not considered organic
molecules.molecules.
imp
ort
ance
imp
ort
ance
1. Alkanes1. Alkanes
Figure 11.4Figure 11.4
10
NameName # of # of C'sC's Structural FormulaStructural Formula
BP BP (C(C))
MP MP (C(C))
methanemethane 11 CHCH44
-161-161 -183-183
ethaneethane 22 CHCH33CHCH
33-88-88 -172-172
propanepropane 33 CHCH33CHCH
22CHCH33
-45-45 -187-187
butanebutane 44 CHCH33CHCH
22CHCH22CHCH
33-.5-.5 -138-138
pentanepentane 55 CHCH33CHCH
22CHCH22CHCH
22CHCH33
3636 -130-130
hexanehexane 66 CHCH33CHCH
22CHCH22CHCH
22CHCH22CHCH
336969 -95-95
heptaneheptane 77 CHCH33CHCH
22CHCH22CHCH
22CHCH22CHCH
22CHCH33
9898 -90-90
octaneoctane 88 CHCH33CHCH
22CHCH22CHCH
22CHCH22CHCH
22CHCH22CHCH
33125125 -57-57
nonanenonane 99 CHCH33CHCH
22CHCH22CHCH
22CHCH22CHCH
22CHCH22CHCH
22CHCH33
151151 -54-54
decanedecane 1010 CHCH33CHCH
22CHCH22CHCH
22CHCH22CHCH
22CHCH22CHCH
22CHCH22CHCH
33
175175 -30-30
AlkanesAlkanes
12
NameName Structural FormulaStructural Formula
methanemethane CC CHCH44
ethaneethane CHCH33CHCH
33
propanepropane CHCH33CHCH
22CHCH33
butanebutane CHCH33CHCH
22CHCH22CHCH
33
pentanepentane CHCH33CHCH
22CHCH22CHCH
22CHCH33
Abbreviated, common method to write organic cmpdsAbbreviated, common method to write organic cmpds
ALKANESALKANES• There are frequently many There are frequently many
hydrocarbons with the same formula. hydrocarbons with the same formula. These are called structural isomers.These are called structural isomers.
CC55HH1212 has three isomers has three isomers
CC1010HH2222 has 75 isomers has 75 isomers
CC2020HH4242 has 366,319 isomers has 366,319 isomers
Isomers of Isomers of Butane-5 Butane-5 Carbon Carbon chainschains
CC66HH1414 has five isomers, has five isomers,
draw them.draw them.
CycloalkanesCycloalkanes
• Cycloalkanes are ring structures and Cycloalkanes are ring structures and have the general formula Chave the general formula CnnHH2n2n. .
• Do not confuse these compounds Do not confuse these compounds with the alkenes which have the with the alkenes which have the same general formula. same general formula.
2. ALKENE AND 3. ALKYNE2. ALKENE AND 3. ALKYNE
• These compounds are referred to as These compounds are referred to as unsaturated. unsaturated.
• Alkenes contain one or more double Alkenes contain one or more double bonds and alkynes contain one or more bonds and alkynes contain one or more triple bonds.triple bonds.
Saturated Hydrocarbon CSaturated Hydrocarbon C1515HH3232
Saturated –vs- UnsaturatedSaturated –vs- Unsaturated
Unsaturated HydrocarbonUnsaturated Hydrocarbon
Contains either double and/or triple bondsContains either double and/or triple bonds
Notice how the chains do not line upNotice how the chains do not line up
ALKENESALKENES
ALKYNEALKYNE
Physical properties Physical properties changechange
Isomers have different physical as well asdifferent chemical properties
NomenclatureNomenclature• Organic Functional Groups and NomenclatureOrganic Functional Groups and Nomenclature
• SubstituentsSubstituents - saturated carbon substituents are called - saturated carbon substituents are called alkyl groups and are named based on the naming of the alkyl groups and are named based on the naming of the normal alkanes.normal alkanes.
methy l
e thyl
CH3
CH2CH3 Et
MeC
H
H
H
C
H
H
C H
H
H
H
H
NomenclatureNomenclature
HaloalkaneHaloalkane
2626
AlcoholAlcohol
2727
EtherEther
2828
AmineAmine
2929
AldehydeAldehyde
3030
KetoneKetone
3131
Carboxylic acidCarboxylic acid
3232
EsterEster
3333
AmideAmide
Common Alcohol NamesCommon Alcohol Names
What is the name of this Alcohol?What is the name of this Alcohol?
methylalcohol
Methanol
The main chain is numbered such that The main chain is numbered such that the first substituent encountered along the first substituent encountered along the chain receives the lowest possible the chain receives the lowest possible
number.number.
NOT
C C C C C
CH3
1 2 3 4 5
2-methylpentane
C C C C C
CH3
12345
4-methylpentane
If two or more identical substituents are attached to If two or more identical substituents are attached to the same C-chain , prefixes di-, tri-, tetra-, etc. are the same C-chain , prefixes di-, tri-, tetra-, etc. are
used with numbers to indicate position.used with numbers to indicate position.
C C C C C
CH3
1 2 3 4 5
2,4-dimethylpentane
CH3
C C C C C
CH3
1
2
3 4 5
2,2-dimethylpentane
CH3
C C C C C
CH3
1 2 3 4 5
4-ethyl-2-methylhexane
CH2CH3
C
6
If two different substituents are attached to the If two different substituents are attached to the carbon chain, name them in alphabetical order.carbon chain, name them in alphabetical order.
Numbering starts closestNumbering starts closestto 1to 1stst functional group functional group
Numbering starts at Numbering starts at the side with thethe side with theheavier functional heavier functional GroupGroup
C C C C C
CH 2CH3
1 2 3 4 5
2-ethyl-4-methylpentane
CH 3
PracticePractice
3-ethylhexane3-ethylhexane
C C C C
C
C C
C
C C C C
C
12
34 5
C C
C6
PracticePractice
methylcyclopentanemethylcyclopentane
1-ethyl-2-methylcyclopentane1-ethyl-2-methylcyclopentane
PracticePractice
C C C C C
Br
2-bromo-4-chloropropane
Cl
C C C C C
Br
2,2,4-tribromopropane
Br
Br
Draw the followingDraw the following
• ButaneButane
• ButeneButene
• ButyneButyne
• ButanolButanol
• ButanalButanal
• ButanoneButanone
• Dibutyl etherDibutyl ether
• Butanoic acidButanoic acid
• Butyl butanoateButyl butanoate
• Butyl amineButyl amine
• Dibutyl amineDibutyl amine
• Tributyl amineTributyl amine
Structure, Bonding, and IsomerismStructure, Bonding, and Isomerism
• Alkenes have the possibility of cis- trans- Alkenes have the possibility of cis- trans- isomerism since the pi bond does not isomerism since the pi bond does not permit rotation. permit rotation.
• Illustration: the three isomers of butene Illustration: the three isomers of butene (isobutene is actually a propene). (isobutene is actually a propene).
• The position of the atoms changes the The position of the atoms changes the physical properties listed. physical properties listed.
• If a molecule has two double bonds If a molecule has two double bonds between carbon atoms, it is called a between carbon atoms, it is called a diene.diene.
Double and Triple BondsDouble and Triple Bonds
trans-2-butenetrans-2-butene
Double and Triple BondsDouble and Triple Bonds
trans-2-pentenetrans-2-pentene
Double and Triple BondsDouble and Triple Bonds
1. Draw a cis, trans-2,4-heptene1. Draw a cis, trans-2,4-heptene
2. Name the following2. Name the following
Preparation of Alkenes Preparation of Alkenes and Alkynesand Alkynes
• Acetylene aka ethyne, from calcium carbide, CaCAcetylene aka ethyne, from calcium carbide, CaC22
• Steam cracking for the formation of ethylene, Steam cracking for the formation of ethylene, ethene, from ethane. ethene, from ethane.
Addition ReactionsAddition Reactions• Symmetrical addition is simple, but asymmetrical Symmetrical addition is simple, but asymmetrical
addition follows Markovnikov's rule: addition follows Markovnikov's rule: the hydrogen the hydrogen adds to the carbon with the most hydrogenadds to the carbon with the most hydrogen..
For alkynes, the addition is always For alkynes, the addition is always twotwo mole to one mole to one mole of alkyne, the product being a substituted mole of alkyne, the product being a substituted alkane. If hydrogen gas is added, the process is alkane. If hydrogen gas is added, the process is called hydrogenation. called hydrogenation.
Markovnikov AdditionMarkovnikov Addition
The hydrogen adds to the carbon with the most hydrogenThe hydrogen adds to the carbon with the most hydrogen
C CHCH3CH2CH2CH2CH2 C CHCH3CH2CH2CH2CH2HBr HBr
ethanol ethanol
Br H
C CHCH3CH2CH2CH2CH2
Br H
Br H
?
?
ALKENE to ALKANEALKENE to ALKANE
ALKENES: AdditionALKENES: Addition
ALKENES: EliminationALKENES: Elimination
AROMATIC COMPOUNDSAROMATIC COMPOUNDS
BenzeneBenzene
NaphthaleneNaphthalene
AROMATIC COMPOUNDAROMATIC COMPOUND• See your text for physical properties of See your text for physical properties of
these compounds. these compounds.
• Aromatics like benzene have spAromatics like benzene have sp22 hybridization with hybridization with delocalized pi electronsdelocalized pi electrons. . The The delocalized delocalized bonding is the key to bonding is the key to these compounds. these compounds.
• They do not undergo addition reactions They do not undergo addition reactions like alkenes and alkynes, but rather react like alkenes and alkynes, but rather react by way of by way of substitutionsubstitution. .
Substitution reactions with aromatic compounds,Substitution reactions with aromatic compounds, not additionnot addition
CH2 CH2 + Br2 C C
H H
Br
H
Br
H
+ Br2
Br
+ HBr
CH3 CH3 + Br2 no react ionCnH2n+2
CnH2n
CnHn
Naming Aromatic CompoundsNaming Aromatic Compounds
OH
phenol
CH3 CH3
CH3
toluene o-xylene
anthracenenapthalene
CH3
CH3
o-xylene
X
CH3
CH3
m-xylene
CH3
CH3
p-xylene
ortho -- o
meta -- m
para -- p
Benzene ReactionsBenzene Reactionshalogenationhalogenation
+ Br2
Br
+ HBr
Benzene ReactionsBenzene Reactionsnitrationnitration
+ HNO3 (conc)
NO2
H2SO4 (conc)+ H3O+
Benzene ReactionsBenzene Reactionsalkylationalkylation
CH3CH2CH2CH2Cl
CH2CH2CH2CH3
AlCl3
ALCOHOLSALCOHOLS
ALCOHOLSALCOHOLS
Naming AlcoholsNaming Alcohols• The alkane name is modified by dropping the e The alkane name is modified by dropping the e
and addingand adding ol. ol.
• If three OH groups are present, the molecule is If three OH groups are present, the molecule is called a called a triol.triol.
CHCH33CHCH22OH is ethanolOH is ethanol
CHCH33C(OH)C(OH)33 is ethantriol is ethantriol
Primary, secondary, and tertiary alcoholsPrimary, secondary, and tertiary alcohols
C OH
R
H
H
C OH
R
R
H
C OH
R
R
R
primary or 1° secondary or 2° tertiary or 3°
What type of alcohol’s are these?What type of alcohol’s are these?
1°, 2°, 3°?1°, 2°, 3°?1°, 2°, 3°?1°, 2°, 3°?
Metalation of AlcoholsMetalation of AlcoholsSodium metal reacts with an alcohol to produce Sodium metal reacts with an alcohol to produce
hydrogen gas and the sodium alkoxide, refered to hydrogen gas and the sodium alkoxide, refered to as a metalation, since the oxygen is still attached.as a metalation, since the oxygen is still attached.
CH3CH2OH + NaH CH3CH2O-Na+ + H2
OH O-Na+
+ NaOH H2O+
6767
Chemistry of AlcoholsChemistry of Alcohols
1.1. Alcohols can go through substitution, Alcohols can go through substitution, and elimination reactionsand elimination reactions
Which means Alcohols are either Which means Alcohols are either oxidized or reducedoxidized or reduced
Formation of ALCOHOLSFormation of ALCOHOLSaddition reaction to an alkeneaddition reaction to an alkene
H2C CH2 + H2OH3PO4
CH3CH2OH
Could also be called an oxidation reactionCould also be called an oxidation reactionbecause we’re adding oxygen to the carbonbecause we’re adding oxygen to the carbon
SubstitutionSubstitution• An alcohol reacts with HX to produce the An alcohol reacts with HX to produce the
alkylhalidealkylhalide and water, where X is Cl, Br, I and water, where X is Cl, Br, I
• CHCH33CHCH22OH + HCl CHOH + HCl CH33CHCH22Cl + HCl + H22OO
EliminationElimination• In the presence of concentrated sulfuric acid and In the presence of concentrated sulfuric acid and
heat an alcohol will eliminate water and form anheat an alcohol will eliminate water and form an alkene; alkene; the reverse of how alcohols are formed. the reverse of how alcohols are formed.
7070
Addition to Ethylene orAddition to Ethylene orElimination by ALCOHOLSElimination by ALCOHOLS
H2C CH2 + H2OH3PO4
CH3CH2OH
H2SO4
Forward is an oxidation, the reverse a reduction.
Alcohols can be oxidized to Alcohols can be oxidized to carboxylic acids or ketonescarboxylic acids or ketones
1. 1. primaryprimary alcohols to aldehydes alcohols to aldehydes withwith mild mild Oxidizing agentsOxidizing agents
CH3CH2 OHC
O
HH3C
PCC
PCC = N+ H CrO3Cl-
Pryidinium chlorochromatePryidinium chlorochromatePryidinium chlorochromatePryidinium chlorochromate
Alcohols can be oxidized directly to Alcohols can be oxidized directly to carboxylic acids or ketonescarboxylic acids or ketones
1. 1. primaryprimary alcohols directly to acids alcohols directly to acids by by STRONGSTRONG oxidizing agentsoxidizing agents
CH3CH2 OHC
O
OHH3C
CrO3, H+
Alcohols can be oxidized to Alcohols can be oxidized to carboxylic acids or ketonescarboxylic acids or ketones
2. secondary2. secondary alcohols to alcohols to ketonesketones
CH
OH
C
O
CH3H3CCH3CH3
2-propanol propanone
PCC
Tertiary alcoholsTertiary alcohols
No reactionNo reaction
Why?Why?Why?Why?
C
OH
CH3CH3
CH3
PCC, or CrCl3no reaction
CARBONYLCOMPOUNDSCARBONYLCOMPOUNDS The The carbonyl groupcarbonyl group is a carbon atom double is a carbon atom double
bonded to an oxygen atom, and is found in bonded to an oxygen atom, and is found in aldehydes, ketones, carboxylic acids, and esters.aldehydes, ketones, carboxylic acids, and esters.
C
O
7676
Suggest a method for makingSuggest a method for making
CARBONYL COMPOUNDSCARBONYL COMPOUNDS
CARBONYL COMPOUNDSCARBONYL COMPOUNDS• The aldehyde has at least one hydrogen The aldehyde has at least one hydrogen
atom bonded the carbonyl carbon. atom bonded the carbonyl carbon.
• The ketone has two carbon atoms bonded The ketone has two carbon atoms bonded to the carbonyl carbon. to the carbonyl carbon.
• The carboxylic acid has an OH bonded to The carboxylic acid has an OH bonded to the carbonyl carbon. the carbonyl carbon.
• The ester is a combination of an alcohol The ester is a combination of an alcohol and a carboxylic acid. and a carboxylic acid.
• aldehyde, RCOH; ketone, RCORaldehyde, RCOH; ketone, RCOR ''; ;
carboxylic acid, RCOOH; ester, RCOORcarboxylic acid, RCOOH; ester, RCOOR ''..
• Carboxylic acidsCarboxylic acids can be formed by oxidizing can be formed by oxidizing primary alcohols or aldehydes. primary alcohols or aldehydes.
• Reducing aldehydes and acids with NaBHReducing aldehydes and acids with NaBH44 or or LiAlHLiAlH44 produces a produces a primary alcohol.primary alcohol.
• Reduction of aReduction of a ketoneketone produces a secondary produces a secondary alcohol.alcohol.
CARBONYL COMPOUNDSCARBONYL COMPOUNDS
8080
EstersEsters• Form from carboxylic acids and alcohols when Form from carboxylic acids and alcohols when
heated with sulfuric acid. They are named from heated with sulfuric acid. They are named from the alcohol and the acid with an ate endingthe alcohol and the acid with an ate ending
CH3CH2OH + CH3COOH CH3COOCH2CH3
8181
EstersEsters
• In basic solution, esters are hydrolyzed In basic solution, esters are hydrolyzed to the alcohol and the salt of the to the alcohol and the salt of the carboxylic acidscarboxylic acids
Alkyl halides RXAlkyl halides RX• React to form alcohols in water using a React to form alcohols in water using a
strong base like NaOH, substitution strong base like NaOH, substitution reaction. reaction.
• In an alcohol solvent, the same reactants In an alcohol solvent, the same reactants form an alkene, elimination reaction.form an alkene, elimination reaction.
8383
Alkyl halidesAlkyl halides• RX react with magnesium metal to form RX react with magnesium metal to form
a a Grignard reagentGrignard reagent..• This reagent reacts with aldehydes and This reagent reacts with aldehydes and
ketones to form alcohols and with ketones to form alcohols and with carbondioxide to form carboxylic acids.carbondioxide to form carboxylic acids.
Ethers R-O-R’Ethers R-O-R’ (Additional material)(Additional material)
• EthersEthers, R-O-R', can be formed from the , R-O-R', can be formed from the reaction of alcohols when heated in the reaction of alcohols when heated in the presence of concentrated sulfuric acid. presence of concentrated sulfuric acid.
• See Lab IVCX 15See Lab IVCX 15
11.6 FATS AND OILS11.6 FATS AND OILS• Fats and oils are esters of glycerolFats and oils are esters of glycerol
1, 2, 3-propanetriol1, 2, 3-propanetriol
• The R group of the triester is a long chain fatty The R group of the triester is a long chain fatty acid. acid.
BOOM!BOOM!
FATS AND OILSFATS AND OILS
• Some fats are saturated, some Some fats are saturated, some unsaturated, and some are unsaturated, and some are polyunsaturated. polyunsaturated.
• When the triester is hydrolyzed with strong When the triester is hydrolyzed with strong base, the sodium or potassium salt forms base, the sodium or potassium salt forms and is called a soap. and is called a soap.
–The process is also called saponfication. The process is also called saponfication.
Single bonds only FatsSingle bonds only Fats
Double bonds FatsDouble bonds Fats
AMINES AND AMIDESAMINES AND AMIDES
• React as bases and have bad smellsReact as bases and have bad smells
• React with carboxylic acids to form React with carboxylic acids to form amidesamides which are similar which are similar
in structure to esters.in structure to esters.
AMINESAMINES
AMIDESAMIDES
PolymersPolymers
SSUULLFFUURR
11.7 SYNTHETIC POLYMERS11.7 SYNTHETIC POLYMERS• PolymersPolymers are formed from combinations of are formed from combinations of
monomers. monomers.
• They can be classified many ways. They can be classified many ways.
–ThermoplasticsThermoplastics can be heated and can be heated and reformed again and again. reformed again and again.
–ThermosettingThermosetting plastics are heated and plastics are heated and formed, but cannot be heated and formed, but cannot be heated and reformed because of their high degree of reformed because of their high degree of cross-linking. cross-linking.
• Another classification system for polymers is Another classification system for polymers is based on their intended use: based on their intended use:
- plastics - plastics - fibers - fibers
- ElastomersElastomers - coatings - coatings
- adhesives - adhesives
• Polymers can also be classified by the way Polymers can also be classified by the way they form: they form:
–addition polymers addition polymers
–condensation polymerscondensation polymers
11.7 SYNTHETIC POLYMERS11.7 SYNTHETIC POLYMERS
Addition PolymersAddition Polymers• The monomers for these polymers all The monomers for these polymers all
have a double bond. have a double bond.
• If an appropriate initiator is added, If an appropriate initiator is added, these monomers can add to the chain these monomers can add to the chain one at a time by breaking the double one at a time by breaking the double bond. bond.
• This process is called chain growth This process is called chain growth polymerization. polymerization.
• Copolymers are formed from a mixture Copolymers are formed from a mixture of monomers. of monomers.
9797
Addition: Free RadicalAddition: Free Radical
Polyethylene: AdditionPolyethylene: Addition
PolypropylenePolypropylene
CH2 CH2 CH2 CH2
n
CH CH2 CH CH2
n
CH3 CH3
PolyethylenePolyethylene(a)
Bridging, crosslink
Linear, straight
Branching
TeflonTeflon
What would the following addition polymers look likeWhat would the following addition polymers look like
CF2 CF2 CF2 CF2
n
CH CH2
Cl
for PVC
CH2 CH
OC
O
CH3
methyl methacrylatefor Lucite, Plexiglass
CH CH2
stryenefor styrofoam
PETE (polyethylene terephthalate), HDPE (high-density polyethylene), LDPE (low-density polyethylene), PP (polypropylene), CLPE (cross-linked polyethylene, V (vinyl) or PVC, also RLDPE (resin mix, already recycled. The # is another way of identifying that polymer.
Condensation PolymersCondensation Polymers• These polymers are usually These polymers are usually
copolymers. copolymers.
• One monomer is a dicarboxylic acid One monomer is a dicarboxylic acid and the other monomer is either a and the other monomer is either a dialcohol or a diamine. dialcohol or a diamine.
• These polymers are named as These polymers are named as polyesterspolyesters or or polyamidespolyamides. .
Nylon 66Nylon 66
Polyamide Polyamide ChainsChains
PolymerPolymer
MonomersMonomers
107