1.4 Acrylates, for example ethyl and isooctyl ??-cyano-??,??-diphenyl acrylate, methyl ??-carbomethoxycinnamate, methyl and butyl ??-cyano-??-methyl-p-methoxycinnamate, methyl ??-carbomethoxy-p-methoxycinnamate and N-(??-carbomethoxy-9-cyanovinyl)-2-methyl indoline.