Question 4.8: Provide structure for the following:a) Most important contri......
Provide structure for the following:
(a) Most important contributing resonance structure of the conjugate acid of 6-methyl-1,3,5-heptatriene.
(b) Most stable intermediate in the following reaction.
(c) The geometrical isomers that exist for 2,4-heptadiene.
(d) The number of stereoisomers that exist for 2,4-hexadiene and for 2-chloro-2,4-hexadiene.
(a) The most important contributing resonance structure is the one in which the carbon atom bearing the positive charge is tertiary.
(b) The most stable intermediate in the reaction is benzylic carbocation as the positive charge gets delocalized over the benzene ring.
(c) Four geometrical isomers exist for 2,4-heptadiene. Their structures are:
(d) For 2, 4-hexadiene, three stereoisomers exist while for 2-chloro-2, 4-hexadiene four stereoisomers exist.
