Abstract The reactions of SO2 with tris-dimethylaminophosphine, bis- dimethylaminofluorophosphine, bis-dimethylaminochlorophosphine, dimethylaminodifluorophosphine, dimethylaminodichlorophosphine, 1, 3-dimethyl-2-fluoro- 1, 3, 2-diazaphospholidine and 1, 3-dimethyl-2-chloro-1, 3, 2-diazaphospholidine have been investigated. The complex reactions are dominated by facile oxidation of the ...