Organic isocyanates ( I ) react with alcohols and phenols (HX) in a sequence of reactions to give carbamates, allophanates and isocyanurates. Rate and equilibrium constants of the individual steps have been determined. The partitioning of the reaction products predominantly depends on the Paper 4/02636E

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Organophosphorus Antioxidants. I. Kinetics and Mechanism of the Decomposition of Alkylhydroperoxides by o‐Phenylene Phosphites and Phosphates The reaction mechanism of 2‐(2, 6‐di‐tert‐butyl‐4‐methyl‐phenoxyl)‐1,3,2‐benzodioxaphosphole (1) with cumyl and t‐butyl hydroperoxide has been studied kinetically by means of 31P‐n.m.r. spectroscopy and high pressure liquid chromatography. 1 reacts with cumyl hydroperoxide to give the corresponding 2‐oxide (2) which with more hydroperoxide and/or water forms the open chained phosphate ester 5. This acidic phosphate decomposes hydroperoxide catalytically. The kinetic parameters of the separate reaction steps are given. The ionic mechanism of hydroperoxide decomposition is accompanied by a homolytic one in a minor proportion.