Novel Cobalt Bis(dicarbollide) Based on Terminal Alkynes and Their Click‐Reactions

Abstract

Novel cobalt bis(dicarbollide) terminal alkynes with charge‐compensated group were synthesized by the cleavage reactions of oxonium derivatives of cobalt bis(dicarbollide) with N,N‐dimethylprop‐2‐yn‐1‐amine. The solid‐state molecular structures of alkynes prepared from 1,4‐dioxane and tetrahydropyran derivatives of cobalt and iron bis(dicarbollide) were determined by single‐crystal X‐ray diffraction. A series of zwitterionic conjugates of cobalt/iron bis(dicarbollide) with cholesterol were prepared using the copper(I)‐catalyzed azide–alkyne cycloaddition reaction.