Tertiary butyl phosphorus compounds

Abstract

Routes to compounds with one or more t-butyl groups directly attached to phosphorus have been explored, and a number of new compounds of this type have been prepared. Reduction of t-butylphosphonothioic dichloride with triphenylphosphine provides a route to t-butylphosphonous dichloride which, although having more stages than that previously described, may be advantageous for large scale operation. The Arbusov reaction and several other general organophosphorus reactions are inhibited when t-butyl groups are attached to phosphorus, but reactions of t-butyl chloride with alkylphosphonous dichlorides (RPCl₂; R = Me, Et, Prⁱ, or Bu^t) provide good routes to the alkyl-t-butylphosphinic chlorides and hence to the corresponding acids. An i.r. band between 805 and 835 cm.^–1 is characteristic of t-butylphosphorus compounds.