L'hydrolyse acide des diazoc�tones alcoyl�es: Formation d'ions ?-acylcarbonium secondaires
作者:H. Dahn、M. Ballenegger
DOI:10.1002/hlca.19690520823
日期:——
Hydrolysis of secondary diazoketones CH3COCN2R (R Me, Et, isopropyl) by aqueous perchloric acid is characterized by rate-determining protonation demonstrated by solvent isotope effects kD2O/kH2O = 0,4–0,6 and by the intervention of general acid catalysis. The product determining step, yielding keto-alcohols and keto-olefines, is independent of added nucleophiles; this is interpreted as resulting from
高氯酸水溶液水解次重氮酮CH 3 COCN 2 R(R Me,Et,异丙基)的特征在于速率测定质子化,其通过溶剂同位素效应证明k D 2 O / k H 2 O = 0,4–0,6并通过一般的酸催化进行干预。产物确定步骤,产生酮醇和酮烯烃,不依赖于所添加的亲核试剂。这被解释为是由于(或多或少的)α-联苯的中间形成而产生的;酮碳鎓是离子。III级观察到的氢化物位移(R =异丙基)支持这种解释。讨论了伯重氮酮和仲重氮酮水解之间的区别。