Cuproussiloxane as two self-assemblies, Cu20O20Si10Me10R10 and Cu24O24Si12Me12R12, with catalytic property

Abstract

Cuproussiloxane (1) was prepared from the reaction of silanediol R(Me)Si(OH)₂ (R = N(SiMe₃)(2,6-iPr₂C₆H₃)) and (CuMes)₄ (Mes = 2,4,6-Me₃C₆H₂). The prepared compound crystalizes into two self-assemblies: Cu₂₄O₂₄Si₁₂Me₁₂R₁₂ ([(CuO)₂Si(Me)R]₁₂, 1a) and Cu₂₀O₂₀Si₁₀Me₁₀R₁₀ ([(CuO)₂Si(Me)R]₁₀, 1b). 1a and 1b feature dodecagonal and decagonal prism X-ray structures, respectively. 1 was found to exhibit good to excellent activity for catalyzing the aerobic C–P cross-coupling reaction of terminal alkynes with H-phosphonates to form alkynylphosphonates (70–99% yields).