Study of Dehydrocoupling Reactions of Diorganotin Dihydrides R1R2SnH2 with Biuret
Abstract
The reaction of unsymmetrical phenylmethyltin dihydride (PhMeSnH2), phenylethyltin dihydride (PhEtSnH2), phenylbutyltin dihydride (PhBuSnH2) and butylmethyltin dihydride (BuMeSnH2) with biuret (H2L) proceeds via SnH/NH dehydrocoupling to afford the corresponding tetra-coordinate cyclic products. The reactions in the molar ratios of 1:1, 2:1 and 1:2 have been studied. The yellow derivatives so isolated were soluble in polar solvents and insoluble in nonpolar solvents. It was found that 1:1 reaction went to completion while 2:1 and 1:2 did not go to completion. The derivatives had been characterized by elemental analysis and spectroscopic techniques viz. IR, 1H NMR, 13C NMR, 119Sn NMR. DSC and TGA of the reaction products have also been studied. All the derivatives were thermally stable upto (190±10) °C and degradation occurred after that.
