less bulky. For t-butylmethylphosphic azide there is very little preference for migration of But relative to Me. Small amounts of unrearranged products such as ButPhP(O)NHOMe and ButPhP(O)NH2 are generally produced in the photolyses, together with the methyl phosphinates RPhP(O)OMe (major product when R = Me) resulting from (non-photochemical) solvolysis of the azide.
当alkylphenylphosphinic酸PRHP(O)N 3(R =
甲基,乙基,
镨我,或卜吨)在MeOH中光解任一烷基或
苯基可以从P到N的Curtius重状重排迁移。产品的组成表明,烷基R的迁移是优选的。但是,该偏好并不大,并且随着R改变Bu t →Pr i →Et→Me(相对于Ph的大约迁移能力分别为2.1、1.7、1.3和1.2)而降低,这可能是因为PhP键具有更好的能力当R的体积较小时,可以假设Ph迁移具有正确的构象。对于叔丁基
甲基叠氮化物,Bu t的迁移非常少。相对于我。少量未重排的产物如卜吨
PHP(O)NHOMe和卜吨
PHP(O)NH 2,一般在photolyses产生,连同
甲基膦酸盐R
PHP(O)OME(主要产物,当R = Me)的从所得(非光
化学)
叠氮化物的溶剂分解。