| abstract |
(57) [Summary] (with correction) [PROBLEMS] To provide an organic phosphorus compound useful as a deterioration inhibitor for organic materials. An organophosphorus compound of the general formula I, for example compound 1. N- [3- (3-t-butyl-4-hydroxy-5-methylphenyl) Propionyl] -N '-(2,4,8,10-tetra -t-Butyl-dibenzo [d, f] [1,3,2] dioxaphosphepin-6-ylpiperazine (Compound 1). |