ALKANES 31 Two bear an ethyl group and a methyl group on a continuous chain of five carbons 3-Ethyl-2-methylpentane 3-Ethyl-3-methylpenta (d) Only one isomer is named as a derivative of butane: 2, 2.3.3-Tetramethylbutan 2.18 (a) The longest continuous chain contains nine carbon atoms. Begin the problem by writing and umbering the carbon skeleton of nonane Now add two methyl groups(one to C-2 and the other to C-3)and an isopropyl group(to C-6) to give a structural formula for 6-isopropyl-2, 3-dimethylnonane CH3 CH(CHsh or CH: CHCHCH,CH,CHCH,CH,CH (b) To the carbon skeleton of heptane(seven carbons) add a tert-butyl group to C-4 and a methyl C-3 to giv C(CH3) CHCH.. CHCH (c) An isobutyl group is-CH, CH(CH3). The structure of 4-isobutyl-l, I-dimethylcyclohexane H3C、 CH, CH(CH3)2 H3C (d) A sec-butyl group is CH_CHCH, CH,. sec-Butylcycloheptane has a sec-butyl group on a even-membered ring (e) A cyclobutyl group is a substituent on a five-membered ring in cyclobutylcycloper Back Forward Main Menu TOC Study Guide Toc Student OLC MHHE WebsiteTwo bear an ethyl group and a methyl group on a continuous chain of five carbons: (d) Only one isomer is named as a derivative of butane: 2.18 (a) The longest continuous chain contains nine carbon atoms. Begin the problem by writing and numbering the carbon skeleton of nonane. Now add two methyl groups (one to C-2 and the other to C-3) and an isopropyl group (to C-6) to give a structural formula for 6-isopropyl-2,3-dimethylnonane. (b) To the carbon skeleton of heptane (seven carbons) add a tert-butyl group to C-4 and a methyl group to C-3 to give 4-tert-butyl-3-methylheptane. (c) An isobutyl group is GCH2CH(CH3)2. The structure of 4-isobutyl-1,1-dimethylcyclohexane is as shown. (d) A sec-butyl group is CH3 = CHCH2CH3. sec-Butylcycloheptane has a sec-butyl group on a seven-membered ring. (e) A cyclobutyl group is a substituent on a five-membered ring in cyclobutylcyclopentane. or CH3CHCH2CH3 1 2 6 4 3 5 H3C H3C CH2CH(CH3)2 or or 1 3 2 4 5 7 6 CH3CH2CHCHCH2CH2CH3 C(CH3)3 CH3 or CH3CHCHCH2CH2CHCH2CH2CH3 CH3 CH(CH3)2 CH3 1 3 2 46 8 57 9 1 2 3 4 5 6 8 7 9 2,2,3,3-Tetramethylbutane 3-Ethyl-2-methylpentane 3-Ethyl-3-methylpentane ALKANES 31 Back Forward Main Menu TOC Study Guide TOC Student OLC MHHE Website