bromoalkylphthalazinones type is efficiently assisted by the neighbouring hydrazinocarbonyl group. The expected order of anchimeric assistance has been found to be dependent on the chain length. The relatively large values of rate constants are due to an entropy effect firmly supported by computed analysis of the conformational equilibria for the bromoethyl chain appended to phthalazinone () and 2,3-dihydroimidazo
相邻的
肼基羰基可有效地辅助稠合
溴代烷基邻苯二氮
酮类的
水解反应。已经发现预期的辅助嵌合顺序取决于链的长度。速率常数的相对较大值是由于分别对
酞菁酮()和2,3-二氢
咪唑并[2,1-a]
酞嗪酮()附加的
溴乙基链的构象平衡的计算分析所坚定地支持的熵效应。该分析的结果与激活熵值非常吻合。