ALDEHYDES AND KETONES: NUCLEOPHILIC ADDITION TO THE CARBONYL GROUP42717.2(b)First write the structure from the name given. Ethyl isopropyl ketone has an ethyl group andan isopropyl group bonded to a carbonyl group.Ethyl isopropyl ketone may be alternatively named 2-methyl-3-pentanone. Its longest contin-uous chain has fve carbons. The carbonyl carbon is C-3 irrespective of the direction in whichthe chain is numbered, and so we choose the direction that gives the lower number to the po-sition that bears the methyl group.(c)Methyl 2,2-dimethylpropyl ketone has a methyl group and a 2,2-dimethylpropyl groupbonded to a carbonyl group.The longest continuous chain has fve carbons, and the carbonyl carbon is C-2. Thus, methyl2,2-dimethylpropyl ketone may also be named 4,4-dimethyl-2-pentanone.(d)The structure corresponding to allyl methyl ketone isBecause the carbonyl group is given the lowest possible number in the chain, the substitutivename is 4-penten-2-one not1-penten-4-one.
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