Reactions of n-Bu < inf > 2 < /inf > SnO and (n-Bu < inf > 3 < /inf > Sn) < inf > 2 < /inf > O with 1,1,2,3,3-Pentamethyltrimethylene Phosphinic Acid: Synthesis and X-ray Crystal Structures of a Novel Spirocyclic Coordination Polymer and a 16-Membered Inorganic Macrocycle

Abstract

The reactions of the sterically hindered phosphinic acid 1,1,2,3,3-pentamethyltrimethylene phosphinic acid [cycP(O)(OH)] with n-Bu 2SnO and (n-Bu3Sn)2O have been studied. Two novel organotin phosphinates, [{(n-Bu2Sn)2(OH)}{cycPO 2}3]n (1) and [(n-Bu3Sn)(cycPO 2)]4 (2), have been isolated in these reactions. Compound 1 is a spirocyclic coordination polymer containing alternate six- (Sn 2PO3) and eight-membered (Sn2P 2O4) rings. In contrast, compound 2 is a 16-membered macrocycle containing tin, oxygen, and phosphorus atoms. The macrocyclic nature of 2 is retained in chloroform solution up to 2 mM concentration.