Synthesis and structural characterization of a terphenyl substituted phosphaalkyne, Ptriple bond; length of mdashC{C6H3(C6H2Me3-2,4,6)2-2,6}

In attempts to form group 15 heteroalkynes, the reactions of Ar′C(O)Cl View the MathML source(Ar′=C6H3(C6H2Pr3i-2,4,6)2-2,6) or Ar″C(O)Cl (Ar″ = C6H3(C6H2Me3-2,4,6)2-2,6) with [LiE(SiMe3)2] (E = P, As or Sb) have been carried out. No reactions occurred with the bulkier acid chloride, Ar′C(O)Cl, whilst reactions only occurred with Ar″C(O)Cl at elevated temperatures. One of these afforded the first terphenyl substituted phosphaalkyne, Ptriple bond; length of mdashCAr″, as an air stable, crystalline solid. The X-ray crystal structure of this compound was obtained.