31 P{ 1 H} NMR Studies of the Preparation of Dichlorotris(2,4,6-tribromophenoxy)phosphorane, Trichlorobis(2,4,6-tribromophenoxy)phosphorane, and Tetrachloro(2,4,6-tribromophenoxy)phosphorane, and their Nonoxidative Chlorination Reactions with Dimethyl Phosphonate

Dichlorotris(2,4,6-tribromophenoxy)phosphorane can serve as a nonoxidative chlorinating agent for the conversion of secondary phosphites into chlorophosphites. However, the route reported for the synthesis of this material only gives a 22% yield, and