Carbon‐Sulfur Bond Cleavage in Methanesulfonate on Diorganotin Quinaldate Platform – Synthesis and Characterization of [(n‐Bu₂SnL)₂SO₄]

Abstract

The synthesis of mixed ligand di‐n‐butyltin complexes, [(n‐Bu2SnL1‐3)2SO4], 2‐4 (HL1‐3 = 2‐quinoline/ 1‐isoquinoline/ 4‐methoxy‐2‐quinoline carboxylic acid) has been realized by reacting n‐Bu2Sn(OMe)OSO2Me, 1a with the corresponding quinaldic acid under solvothermal conditions. The observed transformation of methane sulfonate to sulfate anion represents a rare example of C‐S bond cleavage on the organotin scaffolds, n‐Bu2Sn(L1‐3)OSO2Me, which have been identified as en route intermediates by NMR and X‐ray crystallography. Analogous reaction when extended with Me2Sn(OMe)OSO2Me, 1b and HL2 yields [(Me2Sn)2(L2)3(OSO2Me)], 5 as partially disproportionated product of Me2Sn(L2)OSO2Me. The solid‐state structures of 2‐5 reveal variable modes of coordination of the ligands to afford molecular and polymeric motifs.