Chapter 18 Organic Chemistry
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Transcript of Chapter 18 Organic Chemistry
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Chapter 18 Organic Chemistry
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Objectives
• 18.1 Write and interpret structural formulas of linear, branched, and cyclic alkanes, alkenes, and alkynes
• 18.1 Distinguish among isomers of a given hydrocarbon
• 18.1 Infer the relationship between fossil fuels and organic chemicals
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Objectives
• 18.2 Compare and contrast the structures of the major classes of substituted hydrocarbons
• 18.2 Summarize properties and uses of each class of substituted hydrocarbons
• 18.3 Identify monomers that form specific polymers; draw structural formulas for polymers made from given monomers.
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Objectives
• 18.3 Differentiate between condensation and addition polymerization reactions
• 18.3 Summarize the relationship between structure and properties of polymers
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Quiz 1 Organic Chemistry
• Naming of Organic Molecules – Anes, enes, ynes, cyclic, substituted including
halogens and alcohols• Drawing of Organic Molecules• Differences and General properties between
Alkanes, Alkenes, Alkynes, and Aromatic Organic Molecules
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Quiz 2 Organic Chemistry
• Isomers• Organic Reactions• Functional Groups (by memory)• Biological Connection – Proteins, Carbohydrates, Lipids, Nucleic Acids
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Organic Chemistry• The chemistry of carbon compounds.• Carbon has the ability to form long
chains.• Without this property, large
biomolecules such as proteins, lipids, carbohydrates, and nucleic acids could not form.
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Hydrocarbons
• Four basic types:– Alkanes– Alkenes– Alkynes– Aromatic hydrocarbons
• With many different functional groups
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Alkanes
• Only single bonds.– Able to rotate freely (unlike other groups)
• Saturated hydrocarbons.– “Saturated” with hydrogens.
• Unreactive (unlike other groups
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Structure of Alkanes
• Tetrahedral geometry.• 109.5° bond angles.
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Structure of Alkanes
• Free rotation about C—C bonds.
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Alkenes
• Contain at least one carbon–carbon double bond.• 120 degree angles• Unsaturated.– Have fewer than maximum number of hydrogens.
• More reactive than alkane, less than alkyne
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Structure of Alkenes
• Unlike alkanes, alkenes cannot rotate freely about the double bond.– Fixed bond
• Reactive bonds (useful for digestion)
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Alkynes
• Contain at least one carbon–carbon triple bond.• Also unsaturated (more unsaturated)• More reactive then alkenes
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Formulas
• Lewis structures of alkanes look like this.• Also called structural formulas.– Skeletal when only carbon and groups drawn
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Formulas
condensed formulas are useful at times
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Cycloalkanes• Carbon can also form ringed structures.• Five- and six-membered rings are most stable.– Can take on conformation in which angles are very close
to tetrahedral angle.– Smaller rings are quite strained.
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Aromatic Hydrocarbons
• Cyclic Carbon chain of 6 with double bonds shared amongst the center
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Aromatic Nomenclature
Many aromatic hydrocarbons are known by their common names.
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Reactions of Aromatic Compounds
• Electrons are delocalized; this stabilizes aromatic compounds.– Middle electrons are
shared
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Structure of Aromatic Compounds
• Two substituents on a benzene ring could have three possible relationships– O(ortho)-: On adjacent carbons.– M(meta)-: One carbon between them.– P(para)-: On opposite sides of ring.
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Properties of Alkanes
• Boiling point increases with length of chain.
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Your typical soap
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Organic Nomenclature
• Three parts to a compound name:– Base: Tells how many carbons are in the longest
continuous chain.
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Organic Nomenclature
• Three parts to a compound name:– Base: Tells how many carbons are in the longest
continuous chain.– Suffix: Tells what type of compound it is.
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Organic Nomenclature
• Three parts to a compound name:– Base: Tells how many carbons are in the longest
continuous chain.– Suffix: Tells what type of compound it is.– Prefix: Tells what groups are attached to chain.
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To Name a Compound…
1. Find the longest chain in the molecule.
2. Number the chain from the end nearest the first substituent encountered.
3. List the substituents as a prefix along with the number(s) of the carbon(s) to which they are attached.
1. Ending becomes - yl
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Nomenclature of Alkynes
• Analogous to naming of alkenes.• Suffix is -yne rather than –ene.
4-methyl-2-pentyne
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Nomenclature of Alkenes• Chain numbered so double bond gets smallest possible
number.• cis- alkenes have carbons in chain on same side of
molecule.• trans- alkenes have carbons in chain on opposite side of
molecule.
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Organic Prefixes (Important Slide)
• Meth = 1 Hex = 6• Eth = 2 Hept = 7• Prop = 3 Octa = 8• But = 4 Non =9• Penta = 5 Dec = 10
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To Name a Compound…
If there is more than one type of substituent in the molecule, list them alphabetically.
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Quiz 2 Organic Chemistry
• Isomers• Organic Reactions• Functional Groups (by memory) • Biological Connection – Proteins, Carbohydrates, Nucleic Acids
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Functional Groups
Term used to refer to parts of organic molecules where reactions tend to occur.
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Note
• For second quiz, you will recognize structures by name and vice versa– A vocabulary if you
will• Don’t need to know
general info about them (except OH/F)
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Halogens/Alcohols
• Increase the Boiling Point (alcohols more due to hydrogen bonding)
• Make the molecules polar (if not countered)• Make the molecules more acidic
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Alcohols• Contain one or more hydroxyl groups, —OH
• Named from parent hydrocarbon; suffix changed to -ol and number designates carbon to which hydroxyl is attached.
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Alcohols
• Much more acidic than hydrocarbons.
• Tend to be reactive• Used to make other
types
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Ethers
• Tend to be quite unreactive.• Therefore, they are good polar solvents.
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Carbonyl Compounds
• Contain C—O double bond.
• Include many classes of compounds.
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Aldehydes
At least one hydrogen attached to carbonyl carbon.
Common: Formaldehyde
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Ketones
Two carbons bonded to carbonyl carbon.
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Carboxylic Acids
• Have hydroxyl group bonded to carbonyl group.
• Tart tasting.• Carboxylic acids are
weak acids. CH3COOH
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Carboxylic Acids
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Esters
• Products of reaction between carboxylic acids and alcohols.
• Found in many fruits and perfumes.
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Amides
Formed by reaction of carboxylic acids with amines.
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Amines
• Organic bases.• Generally have strong, unpleasant odors.
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Chirality• Carbons with four different groups attached to them are
handed, or chiral.• Optical isomers or stereoisomers• If one stereoisomer is “right-handed,” its enantiomer is
“left-handed.”
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Chirality
• Many pharmaceuticals are chiral.• Often only one enantiomer is clinically active.– Difference between sugars that are not
recognized by body and those that are
S-ibuprofen
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Biology Connection
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Amino Acids and Proteins
• Proteins are polymers of -amino acids.– Amino acids = Have an
amine functional group and are acidic
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Amino Acids and Proteins
• Hydrogen bonding in peptide chains causes coils and helices in the chain.
• Kinking and folding of the coiled chain gives proteins a characteristic shape.
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Amino Acids and Proteins
• Most enzymes are proteins.
• The shape of the active site complements the shape of the substrate on which the enzyme actshence, the “lock- and-key” model.
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Carbohydrates
Simple sugars are polyhydroxy aldehydes or ketones.
Are Isomers of one another, differ in location of oxygen
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Carbohydrates
• In solution they form cyclic structures.
• These can form chains of sugars that form structural molecules such as starch and cellulose.
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Nucleic AcidsTwo of the building blocks of RNA and DNA are sugars (ribose or deoxyribose) and cyclic bases (adenine, guanine, cytosine, and thymine or uracil).
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Nucleic Acids
These combine with a phosphate to form a nucleotide.
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Nucleic Acids
Nucleotides combine to form the familiar double-helix form of the nucleic acids.
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Isomers
Have same molecular formulas, but atoms are bonded in different order.
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Reactions of Alkenes
• Addition Reactions• Two atoms (e.g., bromine) add across the double
bond.• Exothermic
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Mechanism (more than you need to know)
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Mechanism of Addition Reactions
• Two-step mechanism:– First step is slow, rate-determining step.– Second step is fast.
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Mechanism of Addition Reactions
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Mechanism of Addition Reactions
In second step, new bond forms between negative bromide ion and positive carbon.
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Reactions of Alkynes
• Undergo many of the same reactions alkenes do.
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More on Reactions
Halogenation of Alkenes
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• Hydrogenation
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Reactions of Alcohols
• An alcohol in the presence of a large acid (such as Sulfuric) can change into an ene instead of an ol. (Called dehydration)
• An alcohol in the presence of a small acid (such as Hydrochloric) can change into an alkyl halide (a hydrocarbon with a halogen on it)
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