Phosphorus‐31 NMR studies of polymer‐supported highly reactive copper reagents

Abstract

AbstractThe chemistry of highly reactive zerovalent copper species represents an active area of research. Recently, active metal chemistry has been successfully accomplished using polymer‐supported triphenylphosphine–copper(I) coordination complexes as precursors. Since the materials are solids, detailed examination of the reagents at vaious stages of chemical reaction can be problematic, since the primary means of examination has historically been proton, 13C and 31P NMR methods. In this study, cross‐polarization magic angle spinning (CPMAS) experiments, combined with 31P T1 relaxation measurements (via proton cross‐polarization), provided data which allowed the determination of the role of the phosphine species in the overall chemistry of these materials. Although it is known that the type of phosphine affects the chemistry, it was found here that there is no observable interaction between the reduced copper species and the polymer‐supported triphenylphosphine.