Additions of carbenium ions to nonconjugated dienes. The retarding (−I)-effect of the second double bond.
作者:Bernhard Irrgang、Herbert Mayr
DOI:10.1016/s0040-4020(01)80918-2
日期:1991.1
Kinetics for the addition of the p-methoxybenzhydryl cation (AnPhCH+, 10) towards nonconjugateddienes 11 [H2C=C(CH3)-(CH2)n-C(CH3)=CH2] have been determined in CH2Cl2 at −30° to −70°C. Reactivity increases with increasing number of methylene groups separating the two double bonds. For n = 4, reactivity reaches the value for saturated alkyl substituents, and nucleophilic assistance of the second double