wherein
R is alkyl, alkenyl, or alkynyl;
R1 and R2 are each independently hydrogen alkyl, or aryl; and
Ar is phenyl, indanyl, benzhydryl, or phenyl, substituted with one or more groups selected from the group consisting of halogen, alkyl, perfluoroalkyl, lower alkoxy, perfluoroalkylalkoxy, dialkylamino, and aroyloxy.
其中R是烷基,烯基或炔基; R1和R2各自独立地是氢,烷基或芳基; 而Ar是苯基,
茚基,苯甲基或苯基,其上取代有一个或多个来自卤素,烷基,
全氟烷基,低级烷氧基,
全氟烷氧基,二烷基
氨基和芳香氧基的基团。