吡啶鎓和
鏻 2-carboxy-1-formyl-2-oxoethylides 与 oxybis(diphenylborane) 反应生成 5-(2-oxo-1-(pyridinio or phosphonio)ethylidene)-2,2-diphenyl-1,3-dioxa -2-borata-4-cyclopentanones,分别代表新型
硼氮和
硼磷甜菜碱。5-(2-oxo-1-pyridinioethylidene)-2,2-diphenyl-1,3-dioxa-2-borata-4-cyclopentanone,1a 的晶体是单斜晶系,a = 15.589(3), b = 12.366( 2), c = 20.1869(11) A, β = 111.227(2)°, Z = 8 (两个独立分子), 空间群P21/a; 和 5-[2-oxo-1-(triphenylphosphonio)ethylidene]-2