Synthesis and X-ray crystal structure of a macrocyclic arsa-aza-oxa-cryptand containing eight-membered As4O4 rings

Abstract

Reaction of N[(CH₂)₂As(C₆H₅)₂]₃(1) with gaseous HI leads to{HN[(CH₂)₂Asl₂]₃}I₂(2) and hydrolysis of (2) with H₂O–NH₃ in tetrahydrofuran gives [N(CH₂CH₂)₃]₈(As₄O₄)₆(3); single crystal X-ray diffraction shows that one moleculer of (3) contains six eight-membereds As₄O₄ring connected together by triethylamine units.