摘要
The reaction of unsymmetrical phenylmethyltin dihydride (PhMeSnH2), phenylethyltin dihydride (PhEtSnH2), phenylbutyltin dihydride (PhBuSnH2) and butylmethyltin dihydride (BuMeSnH2) with biuret (HAL) 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 (1904- 10)℃ and degradation occurred after that.
The reaction of unsymmetrical phenylmethyltin dihydride (PhMeSnH2), phenylethyltin dihydride (PhEtSnH2), phenylbutyltin dihydride (PhBuSnH2) and butylmethyltin dihydride (BuMeSnH2) with biuret (HAL) 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 (1904- 10)℃ and degradation occurred after that.