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Portmess Homework Q&S 60

Portmess Homework Q&S 60 - 54 CONFORMATIONS OF...

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( b ) Both models represent alkanes of molecular formula C 6 H 14 . In each one the carbon chain is unbranched. The two models are different conformations of the same compound, CH 3 CH 2 CH 2 CH 2 CH 2 CH 3 (hexane). ( c ) The two compounds have the same constitution; both are (CH 3 ) 2 CHCH(CH 3 ) 2 . The Newman projections represent different staggered conformations of the same molecule: in one the hydrogens are anti to each other, whereas in the other they are gauche. ( d ) The compounds differ in the order in which the atoms are connected. They are constitutional isomers. Although the compounds have different stereochemistry (one is cis, the other trans), they are not stereoisomers. Stereoisomers must have the same constitution. ( e ) Both structures are cis -1-ethyl-4-methylcyclohexane (the methyl and ethyl groups are both up ). In the structure on the left, the methyl is axial and the ethyl equatorial. The orientations are opposite to these in the structure on the right. The two structures are ring- fl ipped forms of
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