Phosphorus–boron compounds. Part IV. The partial bromination and iodination of 1,1,3,3,5,5-hexaphenylcyclotriphosphinoborine

Abstract

Bromination of 1,1,3,3,5,5-hexaphenylcyclotriphosphinoborine using either N-bromosuccinimide or iodine monobromide gives a series of substitution products, P₃Ph₆B₃H_6–nBr_n(n= 1–6), including two isomeric tribromo-derivatives (n= 3). Iodination with iodine monochloride gives the products P₃Ph₆B₃H_6–nln(n= 1–3). The i.r. spectra suggest that non-geminal substitution occurs preferentially in both series of compounds.