Seleniranium and Telluriranium Salts

Abstract

Seleniranium salts [Ad₂ SeR]⁺ X^- (2-8), which are moderately stable at room temperature, were synthesized by addition of RSe⁺ X^- equivalents to the bulky olefin bis(adamantylidene) Ad=Ad (1), where R is aryl or alkyl and X^- is Tf₂ N^- , B(C₆ F₅ )₄ ^- , or SbCl₆ ^- . Unstable telluriranium salts [Ad₂ TeR]⁺ X^- (9-12) were obtained by addition of RTe⁺ X^- equivalents to 1 (R=Ph, Et; X^- =Tf₂ N^- , BF₄ ^- ). The compounds were characterized by NMR spectroscopy and quantum chemical calculations, and the Se compounds also by ESI mass spectrometry. Crystal structures were determined for seleniranium salts 2 and 7 and telluriranium salt 9.

Keywords: ab initio calculations; heterocycles; selenium; strained molecules; tellurium.