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1. Why is the hydrogenation of dienes easily carried out at the intermediate carbon-carbon double bond? rather than being added to the carbon-carbon double bonds on both sides. 2. Why do the carbon-carbon double bonds in simple alkenes tend to shift from both sides toward the center?
This post was last edited by hxjjx on 2020-3-29 09:34 (1) The more alkyl groups attached to the carbon atoms of the double bond, the lower the hydrogenation enthalpy and the more stable the alkene: R2C=CR2 > R2C=CHR > R2C=CH2 > RCH=CH2 > CH2=CH2； (2) The trans isomer is more stable than the cis isomer.