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[PDF] Unit One Part 2: naming and functional groups

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Unit One Part 2: naming and functional groups

gjr---

• To write and interpret IUPAC names for small, simple molecules• Identify some common functional groups found in organic molecules

1 viagra™ (trade name) sildenafil (trivial name) pyrazolo[4,3-d] pyrimidin-7(6H)-one N N N N S N N H 3 C H 3 C O O CH 3 H 3 C O O H dr gareth rowlands; g.j.rowlands@massey.ac.nz; science tower a4.12 http://www.massey.ac.nz/~gjrowlan

Systematic (IUPAC) naming

gjr---

• Comprises of three main parts• Note: multiple bond index is always incorporated in parent section

2 substituents / minor functional groups number of C

AND multiple bond

index principal functional group

SUFFIXPREFIXPARENT

No. CarbonsRootNo. CarbonsRoot1meth6hex

2eth7hept3prop8oct4but9non5pent10dec

Bond

Multiple-bond

index

C-Can(e)C=Cen(e)C㲇Cyn(e)

Systematic (IUPAC) naming: functional groups

gjr--- 3

Functional groupStructureSuffixPrefixGeneral form

acid ROH O -oic acid -carboxylic acid carboxyR-COOHanhydride ROR OO -oic anhydride -carboxylic anhydride

R-C(O)OC(O)-Racyl chloride

RCl O -oyl chloride -carbonyl chloride chlorocarbonylR-COClester ROR O -oate -carboxylate alkoxycarbonylR-COORamide RNH 2 O -amide -carboxamide carbamoylR-CONH 2 nitrile NR -nitrilecyanoR-C㲇N aldehyde RH O -al -carbaldehyde oxoR-CHOketone RR O -oneoxoR-CO-R alcohol ROH -olhydroxyR-OHamine RNH 2 -amineaminoR-NH 2 ether R O R -etheralkoxyR-O-R alkyl bromide (alkyl halide) RBr bromo (halo) R-Br (R-X)

Nomenclature rules

gjr--- H 3 CCH 3 CH 3

4-methylheptane

H 3 C CH 3 OH

2-propyl-1-pentanol

1 2 3 4 5 H 3 COH O butanoic acid H 3 CNH 2 OCH 3

3-methylbutanamide

H 3 CCH 3 O

2-pentanone

pentan-2-one

NOT 4-pentanone

1. Parent - root derived from number of carbon in longest unbranched chain

.containing functional group 4

2. Suffix - basic name derived by adding ending of major functional group (FG)3. Position - position of FG denoted by Arabic numeral placed before whole

....name or just before ending. Numbering achieves lowest number for FG

Nomenclature rules II

gjr--- H 3 CCH 3 H 3 CCH 3 CH 3

2,2,5-trimethylheptane

NOT 3,6,6-trimethylheptane

H 3 CCH 3 CH 3 CH 3 Cl

8-chloro-2,3-dimethylnonane

NOT 2-chloro-7,8-dimethylnonane

5

4. Prefix - substituents are designated by prefix & Arabic number indicating

....position (lowest possible numbering)

5. FG - if more than one FG name & number based on principle FG. List of

....priorities given in course notes. Multiple bonds are added to parent (end), ....all others are prefixes

6. Minor FG - halo-, nitro- (-NO

2 ), nitroso- (-NO) & azo- (-N 2 -) are considered ....substituents & not FG for nomenclature only

7. Order - substituents are written in alphabetical order

HOOH O H 3 CCH 3

5-hydroxy-2,2-dimethylpentanoic acid

CH 3 OH O O H 3 C

2-methyl-4-oxohex-2-enoic acid

Examples: structure to name

gjr--- 6

Step 1: rootStep 3: multiple-

bond index H 3 CN H O CH 3 OH H 3 CN H O CH 3 OH hept H 3 CN H O CH 3 OH hept-6-enamide 1 2 3 4 5 6 H 3 CN H O CH 3 OH 1 2 3

3-hydroxyhept-6-enamide

H 3 CN H O CH 3 OH hept amide

Step 2: suffixStep 4: functional

groups (prefix) H 3 CN H O CH 3 OH 1 2 3 4 5

3-hydroxy-5-methylhept-6-enamide

Step 5: substituents

(prefix) H 3 CN H O CH 3 OH

N-ethyl-3-hydroxy-5-methylhept-6-enamide

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