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Aldehydes have naming priority over ketones, both aldehydes and ketones have are higher priority IUPAC Nomenclature of class II carbonyls follows these steps: 1) Find the longest Practice Carbonyl Nomenclature: O OH O OH F F F

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Lievens, January 2012 University of California, Davis Chemistry 118 Series 27 Intermediate IUPAC Nomenclature VIII Aldehydes and Ketones Class II Carbonyls - Aldehydes and Ketones: • Aldehydes have the general group -CHO where a carbon is double bonded to an oxygen (a carbonyl) and also has a hydrogen attached. Ketones have the general group -COR where a carbon is double bonded to an oxygen (a carbonyl) and has two alkyl groups attached. Carbonyl groups are polar but do not donate hydrogens to H-bonds so have moderate boiling points and slight water solubility. • Aldehydes have naming priority over ketones, both aldehydes and ketones have are higher priority than alcohols and are lower priority than carboxylic acid derivatives • IUPAC Nomenclature of class II carbonyls follows these steps: 1) Find the longest chain of continuous carbons that includes the carbon attached to the carbonyl. This is now the main chain. Name this chain as if it were a straight chain alkane. a. If the carbonyl is an aldehyde drop the -e ending and add -al. b. If the carbonyl is a ketone drop the -e ending and add -one. 2) Count the carbons in the main chain left to right and right to left. The direction you first run into the carbon attached to the carbonyl is the direction use to number the chain. a. In aldehydes the carbonyl carbon is always C-1. b. If the numbers are the same go to the next highest priority functional group or substituent and follow its priority rules. 3) Give each substituent a number according to which carbon itʼs attached to. Numbers for alkenes and alkynes correspond to the lower numbered of the two carbons in the bond. a. If both aldehydes and ketones are in the same molecule the aldehyde gets the -al ending and the ketone becomes an oxo- substituent. 4)

List the substituents in alphabetical order in front of the main chain as you would in an alkane. Alkenes and alkynes are always listed as -ene or -yne at the end of the name. 5) Multiple substituents of the same kind are combined and given a prefix to indicate the number. (di-, tri-, tetra-) these prefixes do not count towards alphabetical order unless they are part of a branched substituent. 6) List any relevant stereochemistry (R,S,E,Z) in parenthesis in front of the substituents. Stereochemistry is italicized. Notes: Carbonyls as substituents are oxo- groups.

Lievens, January 2012 University of California, Davis Chemistry 118 Series 28 Notes: Cycloalkanes with a single carbon -CHO (formyl) group attached are given the base name: cycloalkanecarbaldehyde. Examples: H

O O H O O O Cl O Cl

Compound A

Compound B

a heptane HO HO Br Br a cyclohexane 1) 2) H O O HO Br 6 4 5 3 1 2 7

The aldehyde is the highest priority

substituent. So we number the molecule R-->L. The postions of the other substituents are not relevent. O Cl 6 4 5 3 1 2

The ketone is the highest priority

substituent and so it gets to be position

1. The next highest priority substituent is

the alkene so it gets the lowest numbers it can 2,3 is lower than 5,6 so we number counter-clockwise. 3) H O O HO Br 6 4 5 3 1 2 7 O Cl 6 4 5 3 1 2

2-methyl

4-oxo-

6-bromo

7-hydroxy

2-ene

3-ethyl

5-chloro

4,5,6)

6-bromo-7-hydroxy-2-methyl-4-oxoheptanal

(Z)-5-chloro-3-ethylcyclohex-2-enone or (Z)-5-chloro-3-ethyl-2-cyclohexenone

Lievens, January 2012 University of California, Davis Chemistry 118 Series 29 Practice Carbonyl Nomenclature: O

OH O OH F F F O Hquotesdbs_dbs2.pdfusesText_2