chapter 23 functional groups
TRANSCRIPT
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Chapter 23“Functional
Groups”
Pre-AP ChemistryCharles Page High School
Stephen L. Cotton
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Section 23.1 - Introduction to Functional Groups
OBJECTIVES:
–Explain how organic compounds are classified.
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Section 23.1 - Introduction to Functional Groups
OBJECTIVES:
–Identify halocarbons and the IUPAC rules for naming halocarbons.
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Section 23.1 - Introduction to Functional Groups
OBJECTIVES:
–Describe how halocarbons can be prepared.
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Functional GroupsMost organic chemistry involves
substituents–often contain O, N, S, or P–also called “functional groups”-
they are the chemically functional part of the molecule, and are the non-hydrocarbon part
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Functional GroupsFunctional group - a specific
arrangement of atoms in an organic compound, that is capable of characteristic chemical reactions.–What is the best way to classify
organic compounds? By their functional groups.
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Functional GroupsThe symbol “R” is used to
represent any carbon chains or rings
Important: Table 23.1, page 726 -- shows some of the major categories, and their functional groups - KNOW THESE.
Table 23.2, p. 727 - alkyl groups
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Halogen SubstituentsHalocarbons - class of organic
compounds containing covalently bonded fluorine, chlorine, bromine, or iodine–General formula: R-X (X = halogen)
Naming? Name parent as normal, add the halogen as a substituent (or prefix) - Examples on page 726
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Halogen Substituents Common names…p.726 The more highly halogenated the
compound is, the higher the b.p. (see Table 23.3, page 728)
Few halocarbons found in nature–but, readily prepared and used–halothane (Fig. 23.3, p.727) and
also the hydrofluorocarbons
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Substitution ReactionsOrganic reactions often much
slowerslower than inorganic reactions–must break strong covalent bond–trying to find new catalysts to
use Substitution - an atom (or group
of atoms) replaces another atom or group of atoms
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Substitution Reactions
A halogen (shown as “X”) can replace a hydrogen to make a halocarbon:R-H + X2 R-X + HX
Sunlight is often a sufficient catalyst:
CH4 + Cl2 → CH3Cl + HClUV light
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Substitution ReactionsTreating benzene with a halogen?
Examples on Page 729Halogens on carbon chains are
readily displaced by hydroxide ions (OH1-) to make an alcohol + a salt: R-X + OH1- R-OH + X1-
CH3-Cl + NaOH CH3-OH + NaClMethanol + sodium chloride
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Substitution Reactions
CH3-I + KOH CH3-OH + KI
CH3CH2Br + NaOH CH3CH2OH + NaBr
Iodomethane Methanol
Bromoethane Ethanol
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Section 23.2Alcohols and Ethers
OBJECTIVES:
–Identify how alcohols are classified and named.
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Section 23.2Alcohols and Ethers
OBJECTIVES:
–Predict how the solubility of an alcohol varies with the length of its carbon chain.
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Section 23.2Alcohols and Ethers
OBJECTIVES:
–Name the reactions of alkenes that may be used to introduce functional groups.
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Section 23.2Alcohols and Ethers
OBJECTIVES:
–Construct the general structure of an ether and describe how ethers are named.
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AlcoholsAlcohols - a class of organic
compounds with an -OH group–The -OH functional group in
alcohols is called a “hydroxyl” group; thus R-OH is the formula
How is this different from the hydroxide ion? (covalent bonding with the carbon- not ionic with a metal like bases)
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Alcohols Aliphatic alcohols classified into
categories according to the number of R groups attached to the carbon with the hydroxyl–1 R group: primary alcohol–2 R groups: secondary alcohol–3 R groups: tertiary alcohol
Note drawings on page 730
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Alcohols Both IUPAC and common names For IUPAC:
–drop the -e ending of the parent alkane name; add ending of -ol, number the position of -OH
–parent is the longest chain that contains the carbon with the hydroxyl attached.
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AlcoholsThe hydroxyl is given the
lowest position numberAlcohols containing 2, 3, and 4
of the -OH substituents are named diols, triols, and tetrols respectively–Examples on page 731
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AlcoholsCommon names:
–similar to halocarbons, meaning name the alkyl group, then followed by the word alcohol
–One carbon alcohol = methyl alcohol
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Alcohols More than one -OH substituents
are called glycols (ethylene glycol?) ** Examples on page 731 ** Phenols - compounds in which a
hydroxyl group is attached directly to an aromatic ring. Cresol is the common name of o, m, and p isomers of methylphenol
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Properties of Alcohols
Much like water, alcohols are capable of hydrogen bonding between molecules–this means they will boil at a
higher temp. than alkanes and halocarbons with a comparable number of atoms
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Properties of Alcohols Alcohols are derivates of water; the
-OH comes from water, and thus are somewhat soluble
Alcohols of up to 4 carbons are soluble in water in all proportions; more than 4 carbons are usually less soluble, because the longer carbon chain is more nonpolar
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Properties of Alcohols Many aliphatic alcohols used in
laboratories, clinics, and industry–Isopropyl alcohol (2-propanol) is
rubbing alcohol; used as antiseptic, and a base for perfume, creams, lotions, and other cosmetics
Ethylene glycol (1,2-ethanediol) - commonly sold as “antifreeze”
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Properties of AlcoholsGlycerol (1,2,3-propanetriol) -
used as a moistening agent in cosmetics, foods, and drugs; also a component of fats and oils
Ethyl alcohol (ethanol) used in the intoxicating beverages; also an important industrial solvent
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Properties of AlcoholsDenatured alcohol- means it
has been made poisonous by the addition of other chemicals, often methyl alcohol (methanol, or wood alcohol).
As little as 10 mL of methanol has been known to cause permanent blindness, and 30 ml has resulted in death!
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Addition Reactions The carbon-carbon single bond is
not easy to break In double bonded alkenes, it is
easier to break a bond Addition reaction- substance is
added at the double or triple bond location, after it is broken
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Addition Reactions Addition of water to an alkene is a
hydration reaction - usually occurs with heat and an acid (such as HCl or H2SO4 acting as a catalyst)
Note sample at top of page 734 for the formation of ethanol from ethene + water
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Addition Reactions If a halogen is added in an addition
reaction, the result is a halocarbon that is disubstituted - middle p. 734
The addition of bromine is often used as a test for saturation - p.734
Addition of a hydrogen halide? -called monosubstituted halocarbon
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Addition Reactions Addition of hydrogen to produce an
alkane is a hydrogenation reaction, which usually involves a catalyst such as Pt or Pd–common application is the
manufacture of margarine from unsaturated vegetable oils (making them solid from a liquid)
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Addition Reactions
The hydrogenation of a double bond is a reduction reaction, which in one sense is defined as the “gain of H”
Top- page 735, ethene is “reduced” to ethane; cyclohexene is “reduced” to cyclohexane
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Ethers A class of organic compounds in
which oxygen is bonded to 2 carbon groups: R-O-R is formula
Naming? The two R groups are alphabetized, and followed by ether
Two R groups the same? Use the prefix di- Examples on page 735
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Ethers Diethyl ether is the one commonly
called just “ether”–was the first reliable general
anesthetic–dangerous- highly flammable, also
causes nausea ethers are fairly soluble in water Alcohol used for fuel in the future?
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Section 23.3Carbonyl Compounds
OBJECTIVES:
–Identify the structure of a carbonyl group as found in aldehydes and ketones.
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Section 23.3Carbonyl Compounds
OBJECTIVES:
–Construct the general formula for carboxylic acids and explain how they are named.
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Section 23.3Carbonyl Compounds
OBJECTIVES:
–Describe an ester.
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Section 23.3Carbonyl Compounds
OBJECTIVES:
–Explain how dehydrogenation is an oxidation reaction.
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Aldehydes and KetonesReview:
–alcohol has an oxygen bonded to a carbon group and a hydrogen
–ether has an oxygen bonded to two carbon groups
An oxygen can also be bonded to a single carbon by a double bond
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Aldehydes and Ketones The C=O group is called the
“carbonyl group”–it is the functional group in both
aldehydes and ketones Aldehydes - carbonyl group
always joined to at least one hydrogen (meaning it is always on the end!)
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Aldehydes and KetonesKetones - the carbon of the
carbonyl group is joined to two other carbons (meaning it is never on the end)
Structures - bottom of page 737
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Aldehydes and Ketones Naming?
–Aldehydes: identify longest chain containing the carbonyl group, then the -e ending replaced by -al, such as methanal, ethanal, etc.
–Ketones: longest chain w/carbonyl, then new ending of -one; number it?
propanone, 2-pentanone, 3-pentanone
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Aldehydes and Ketones
Table 23.4, page 738 examples Neither can form intermolecular
hydrogen bonds, thus a much lower b.p. than corresponding alcohols
wide variety have been isolated from plants and animals; possible fragrant odor or taste; many common names
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Aldehydes and KetonesBenzaldehydeCinnamaldehydeVanillinMethanal (the common name is:
formaldehyde)–40% in water is formalin, a
preservative
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Aldehydes and KetonesPropanone (common: acetone)
is a good solvent; miscible with water in all proportions
why is it a good substance used in nail-polish removers? (a powerful solvent-able to dissolve both polar & nonpolar)
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The Carboxylic Acids… Also have a carbonyl group (C=O),
but is also attached to a hydroxyl group (-OH) = “carboxyl” group
general formula: R-COOH–weak acids (ionize slightly)
Named by replacing -e with -oic and followed by the word acid
methanoic acid; ethanoic acid
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Carboxylic Acids Abundant and widely distributed in
nature, many having a Greek or Latin word describing their origin–acetic acid (ethanoic acid) from
acetum, meaning vinegar–many that were isolated from fats
are called fatty acids Table 23.6 page 741
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The Esters… General formula: RCOOR Derivatives of the carboxylic acids, in
which the -OH from the carboxyl group is replaced by an -OR from an alcohol:carboxylic acid + alcohol ester + water
many esters have pleasant, fruity odors- banana, pineapple, perfumes
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EstersAlthough polar, they do not form
hydrogen bonds (reason: there is no hydrogen bonded to a highly electronegative atom!)–thus, much lower b.p. than the
hydrogen-bonded carboxylic acids they came from
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EstersCan be prepared from a
carboxylic acid and an alcohol; usually a trace of mineral acid added as catalyst (because acids are dehydrating agents)
Note equation on bottom p. 742
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EstersNaming? It has 2 words:
–1st: alkyl attached to single bonded oxygen from alcohol
–2nd: take the acid name, remove the -ic acid, add -ate
example on top of page 743
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Oxidation- Reduction Reactions All of the previous classes of organic
compounds are related by oxidation and reduction reactions
What is oxidation-reduction?–Oxidation: the gain of oxygen, loss
of hydrogen, or loss of e-1
–Reduction: the loss of oxygen, gain of hydrogen, or gain of e-1
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Oxidation- Reduction ReactionsOxidation and reduction
reactions (sometimes called redox) are coupled- one does not occur without the other
The number of Oxygen and Hydrogen attached to Carbon indicates the degree of oxidation
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Oxidation- Reduction ReactionsThe fewer the # of H on a C-C
bond, the more oxidized the bond–Thus, a triple bond is more
oxidized than a double bond and a single bond
An alkane is oxidized (loss of H) to an alkene, and then to an alkyne
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Oxidation- Reduction Reactions
Loss of hydrogen is called a dehydrogenation reaction–may require strong heating
and a catalystNote equations at the top on
page 744
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Oxidation- Reduction Reactions Methane can be oxidized in steps
to carbon dioxide (middle p. 744):methane methanol methanal methanoic acid CO2
the more reduced (more H) a carbon compound, the more energy it can release upon oxidation
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Oxidation- Reduction ReactionsAlcohols can also be oxidized
into other products “Dr. Al K. Hall Mr. Al D. Hyde”Equations middle of page 745Preparing aldehydes from a
primary alcohol is a problem, because they are then easily oxidized to carboxylic acids
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Oxidation- Reduction Reactions
Benedict’s test and Fehling’s test are commonly used for aldehyde detection – Figure 23.19 p. 745
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Section 23.4Polymerization
OBJECTIVES:
–Describe how addition polymers are formed.
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Section 23.4Polymerization
OBJECTIVES:
–Describe how condensation polymers are formed.
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Addition PolymersPolymers are giant molecules,
not small like the ones studied earlier in this chapter–examples are plastics
Polymer- large molecule formed by the covalent bonding of smaller molecules called monomers
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Polymers from Monomers
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Addition PolymersAn addition polymer forms when
unsaturated monomers react to form a polymer–ethene will form polyethylene,
shown on page 747–polyethylene is easy to clean,
chemically resistant- milk bottles, plastic wrap, refrigerator dishes
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High Density Polyethylene
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Addition Polymers Polypropylene is a stiffer polymer, used
in utensils and containers Polystyrene is formed from styrene
(phenylethene), and is a poor heat conductor (styrofoam ® Dow Chemical)–molded coffee cups and picnic
coolers, insulates homes Polyvinyl chloride (PVC) used for pipes
in plumbing
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Addition PolymersPolytetrafluoroethene (PTFE, or
teflon ® DuPont) is very resistant to heat and chemical corrosion–found on nonstick cookware;
coating on bearings and bushings used in chemical reactors
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Condensation PolymersCondensation polymers are
formed by the head-to-tail joining of monomer units–usually accompanied by the
loss of water from the reacting monomers, and forming water as a product
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Condensation Polymers Ex: polyethylene terephthalate (PET)
–Dacron (® DuPont), Fortrel (® Wellman), Polyesters: permanent press clothing, tire cords
–Sheets of polyester called Mylar (® DuPont), used as magnetic tape in tape recorders and computers, as well as balloons
–Nylon: carpet, fishing line, hosiery
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Condensation Polymers Examples:
–aromatic rings form Nomex (® DuPont), which is a poor electrical conductor; makes parts for electrical fixtures; flame resistant clothing for race car drivers; flame resistant building materials
–Kevlar (® DuPont): strong and flame resistant
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Plastic container code system.
CODE MATERIAL PERCENT OF TOTAL
Polyethylene Terephthalate (PET) 20-30 percent
High Density Polyethylene 50-60 percent
Polyvinyl Chloride (PVC) 5-10 percent
Low Density Polyethylene 5-10 percent
Polypropylene 5-10 percent Polystyrene 5-10 percent All other resins 5-10 percent
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What Do the Numbers Mean?1 -- PETE (Polyethylene terephthalate)
•PET (or PETE) is used in the production of soft drink bottles, peanut butter jars... •PET can be recycled into fiberfill for sleeping bags, carpet fibers, rope, pillows...
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What Do the Numbers Mean?2 -- HDPE (High-density polyethylene)
•HDPE is found in milk jugs, butter tubs, detergent bottles, motor oil bottles... •HDPE can be recycled into flower pots, trash cans, traffic barrier cones, detergent bottles...
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What Do the Numbers Mean?
3 -- V (Polyvinyl chloride)•PVC is used in shampoo bottles, cooking oil bottles, fast food service items... •PVC can be recycled into drainage and irrigation pipes...
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What Do the Numbers Mean?
4 -- LDPE (Low-density polyethylene)
•LDPE is found in grocery bags, bread bags, shrink wrap, margarine tub tops... •LDPE can be recycled into new grocery bags...
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What Do the Numbers Mean?
5 -- PP (Polypropylene)•PP is used in most yogurt containers, straws, pancake syrup bottles, bottle caps.... •PP can be recycled into plastic lumber, car battery cases, manhole steps...
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What Do the Numbers Mean?
6 -- PS (Polystyrene)•PS is found in disposable hot cups, packaging materials (peanuts), and meat trays... •PS can be recycled into plastic lumber, cassette tape boxes, flower pots...
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What Do the Numbers Mean?
7 -- Other•This is usually a mixture of various plastics, like squeeze ketchup bottles, "microwaveable" dishes...
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Timeline of Plastics1862 – First man-made plastic
1866 – Celluloid makes it’s debut
1891 – Rayon is discovered
1907 – Bakelite is invented
1913 – Cellophane causes the plastics craze
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Timeline of Plastics1926 – PVC is invented
1933 – Polyethylene is discovered
1933 – Saran makes it’s debut
1938 – Teflon is discovered
1939 – Nylon stockings hit market
1957 – Here comes velcro
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