STRUCTURE AND PREPARATION OF ALKENES: ELIMINATION REACTIONS (b) Write out the structure in detail, and identify the longest continuous chain that includes the double bond CH CH2 CH, CH3 CHCH H,CH The longest chain contains six carbon atoms and the double bond is between C-3 and c-4 The compound is named as a derivative of 3-hexene. There are ethyl substituents at C-3 and C-4. The complete name is 3, 4-diethyl-3-hexene (c) Write out the structure completel H The longest carbon chain contains four carbons. Number the chain so as to give the lowest numbers to the doubly bonded carbons, and list the substituents in alphabetical order. This compound is 1, I-dichloro-3, 3-dimethyl-l-butene. (d) The longest chain has five carbon atoms, the double bond is at C-1, and there are two methyl substituents. The compound is 4, 4-dimethyl-l-pentene (e) We number this trimethylcyclobutene derivative so as to provide the lowest number for the substituent at the first point of difference. We therefore number H C H. rather than H,C The correct IUPAC name is 1, 4, 4-trimethylcyclobutene, not 2, 3, 3-trimethylcyclobutene (f) The cyclohexane ring has a 1, 2-cis arrangement of vinyl substituents. The compound cis-1, 2-divinylcyclohexane (g) Name this compound as a derivative of cyclohexene. It is 1, 2-divinylcyclohexene 5.24 (a) Go to the end of the name, because this tells you how many carbon atoms are present in the longest chain. In the hydrocarbon name 2, 6, 10, 14-tetramethyl-2-pentadecene, the suffix pentadecane"reveals that the longest continuous chain has 15 carbon atoms and that there Back Forward Main Menu TOC Study Guide Toc Student OLC MHHE Website(b) Write out the structure in detail, and identify the longest continuous chain that includes the double bond. The longest chain contains six carbon atoms, and the double bond is between C-3 and C-4. The compound is named as a derivative of 3-hexene. There are ethyl substituents at C-3 and C-4. The complete name is 3,4-diethyl-3-hexene. (c) Write out the structure completely. The longest carbon chain contains four carbons. Number the chain so as to give the lowest numbers to the doubly bonded carbons, and list the substituents in alphabetical order. This compound is 1,1-dichloro-3,3-dimethyl-1-butene. (d ) The longest chain has five carbon atoms, the double bond is at C-1, and there are two methyl substituents. The compound is 4,4-dimethyl-1-pentene. (e) We number this trimethylcyclobutene derivative so as to provide the lowest number for the substituent at the first point of difference. We therefore number The correct IUPAC name is 1,4,4-trimethylcyclobutene, not 2,3,3-trimethylcyclobutene. ( f ) The cyclohexane ring has a 1,2-cis arrangement of vinyl substituents. The compound is cis-1,2-divinylcyclohexane. (g) Name this compound as a derivative of cyclohexene. It is 1,2-divinylcyclohexene. 5.24 (a) Go to the end of the name, because this tells you how many carbon atoms are present in the longest chain. In the hydrocarbon name 2,6,10,14-tetramethyl-2-pentadecene, the suffix “2-pentadecene” reveals that the longest continuous chain has 15 carbon atoms and that there H H H3C H3C H3C 1 4 2 3 H3C H3C H3C 2 3 1 4 rather than 1 2 3 4 5 C H3C H3C CH3 C H C Cl Cl 3 4 2 1 C CH3CH2 CH2CH3 CH3CH2 CH2CH3 C 1 2 5 6 3 4 STRUCTURE AND PREPARATION OF ALKENES: ELIMINATION REACTIONS 99 Back Forward Main Menu TOC Study Guide TOC Student OLC MHHE Website