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Portmess Homework Q&S 80

Portmess Homework Q&S 80 - carbon that bears the...

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( b ) This compound has the same carbon skeleton as the compound in part ( a ) but bears a hydroxyl group in place of the bromine and so is named as a derivative of 1-pentanol. ( c ) This molecule is a derivative of ethane and bears three chlorines and one bromine. The name 2-bromo-1,1,1-trichloroethane gives a lower number at the f rst point of difference than 1-bromo-2,2,2-trichloroethane. ( d ) This compound is a constitutional isomer of the preceding one. Regardless of which carbon the numbering begins at, the substitution pattern is 1,1,2,2. Alphabetical ranking of the halo- gens therefore dictates the direction of numbering. Begin with the carbon that bears bromine. ( e ) This is a tri F uoro derivative of ethanol. The direction of numbering is dictated by the hydroxyl group, which is at C-1 in ethanol. ( f ) Here the compound is named as a derivative of cyclohexanol, and so numbering begins at the
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Unformatted text preview: carbon that bears the hydroxyl group. ( g ) This alcohol has its hydroxyl group attached to C-2 of a three-carbon continuous chain; it is named as a derivative of 2-propanol. ( h ) The six carbons that form the longest continuous chain have substituents at C-2, C-3, and C-5 when numbering proceeds in the direction that gives the lowest locants to substituents at the f rst point of difference. The substituents are cited in alphabetical order. Had numbering begun in the opposite direction, the locants would be 2,4,5 rather than 2,3,5. 1 2 3 4 5 6 Br 5-Bromo-2,3-dimethylhexane CH 3 CH 3 OH 2-Cyclopentyl-2-propanol cis-3-tert-Butylcyclohexanol OH 2,2,2-Trifluoroethanol CF 3 CH 2 OH 1-Bromo-1,2,2-trichloroethane Cl 2 CHCHBr Cl Cl 3 CCH 2 Br 2-Bromo-1,1,1-trichloroethane CH 3 CH 3 CHCH 2 CH 2 CH 2 OH 4-Methyl-1-pentanol 74 ALCOHOLS AND ALKYL HALIDES...
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