Sterically hindered organometallics. Synthesis of four-membered rings containing tin, oxygen, and sulphur. The crystal structure of 2,2,4,4-tetra(2,4,6-tri-isopropylphenyl)-1-oxa-3-thia-2,4-distannetane

Abstract

Reaction of Na₂S·9H₂O with 1,1,2,2-tetra(2,4,6-tri-isopropylphenyl)-1,2-dibromoditin in air yields the sterically hindered four-membered 1-oxa-3-thia-2,4-distannetane ring, which is a distorted rhombohedron containing distinct Sn–S [243.9(4), 243.5(4) pm] and Sn–O [204.2(8), 202.6(8) pm] bonds; the same reagents react under anaerobic conditions to yield the corresponding 1,3-dithia-2,4-distannetane, suggesting a three-membered 1-thia-2,3-distannirane as the common intermediate in the two reactions.