Alkyl groups undergo [ 1,5 ] shifts very poorly , usually requiring high temperatures , however , for cyclohexadienes , the temperature for alkyl shifts is n't much higher than that for carbonyls , the best migratory group .
Alkyl groups undergo [ 1,5 ] shifts very poorly and usually require high temperatures . However , for cyclohexadienes , the temperature for alkyl shifts is not much higher than that for carbonyls , the best migratory group .