REACTION OF P-PHENYL C-AMINOPHOSPHAALKENE S WITH P-CHLOROBENZONITRILEOXIDES - THERMAL-BEHAVIOR OF THE ADDUCTS

P-phenyl C-aminophosphaalkenes 1 react with p-chlorobenzonitrile oxide s at -20 degrees C leading to 1,2,4-oxazaphospholines 2, which are cha racterized by NMR and decompose slowly at room temperature. An experim ental and theoretical study of their thermal evolution shows that the most probable mechanism involves the formation of an azaphospholine su ch as 10 which is unstable generating a phenyl phosphinidene. The latt er polymerize quickly.