Phosphorus substituted 4-methyloxetan-2-ones, processes for their
申请人:Ciba-Geigy Corporation
公开号:US04384966A1
公开(公告)日:1983-05-24
Compounds having the formula ##STR1## are described, wherein X is oxygen or sulphur or the moiety X is absent and A and D are as defined in claim 1. Compounds I may be prepared by reacting a compound ##STR2## with diketene in the presence of an agent capable of forming free radicals. They are useful as friction modifiers and/or antiwear additives in lubricating oils or for imparting flame-retardancy to natural or synthetic polymers.