butyne-1,4-dione ; 1-Methoxy-phenyl-4-Phenyl-2-Butyne-1,4-dione ; 4-oxo-4-phenyl-Methyl-2-butynoate and 1,3-diphenyl-1-propyne-2-one. All these reactions were performed in presence of protic trapping reagents ZH such as methanol , phenol or phtalimid . All these reactions lead to a very unstable 1,3 dipolar species like
环状和无环的三价
磷化合物(,,,)与活化的羰基的
乙炔基化合物如1-4二
苯基-
2-丁炔-1,4-二
酮反应; 1-甲
氧基-
苯基-4-
苯基-
2-丁炔-1,4-二
酮; 4-
氧代-4-
苯基-
甲基-2-
丁酸酯和1,3
-二苯基-1-
丙炔-2-
酮。所有这些反应都是在质子俘获剂ZH(如
甲醇,
苯酚或邻
苯二甲
酰亚胺)的存在下进行的。所有这些反应导致非常不稳定的1,3偶极子物种,例如