Abstract
Several unique examples of phosphorus macrocycles, with PC double bonds, are obtained by a simple synthetic sequence that exploits the reactivity of 1,3,2-diazaphosphinines with silyl-substituted 1,4-diynes. In addition to the synthesis of calix[3] 1 and calix[4] 2, mixed macrocycles incorporating phosphinine, furan or thiophene units have also been prepared and structurally characterized.
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