Synthesis

Organophosphorus Compounds; 142: A Simple Approach to 1, 2, 4-Selena-and Telluradiphospholes from Phosphaalkynes and the Chalcogen Elements and a First …

SMF Asmus, U Bergsträßer, M Regitz

Index: Asmus, Sven M. F.; Bergstraesser, Uwe; Regitz, Manfred Synthesis, 1999 , # 9 p. 1642 - 1650

Full Text: HTML

Citation Number: 25

Abstract

Abstract: Phosphaalkynes 3 react with elemental selenium or tellurium to furnish the 1, 2, 4- selena-(5) or 1, 2, 4-telluradiphospholes (15), respectively. Although the telluradiphospholes 15 do not exhibit any selective cycloaddition reactivity, two equivalents of the phosphaalkyne 3 do undergo cycloaddition to the selenadiphospholes 5 through a [4+ 2]/[2+ 2+ 2] sequence to afford the tetracyclic products 8. The crystal structure of compound 8a ...