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Study of Dehydrocoupling Reactions of Diorganotin Dihydrides R 1 R 2 SnH 2 with Biuret
Author(s) -
Deep Gagan,
Narula A. K.
Publication year - 2007
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200790166
Subject(s) - chemistry , biuret test , molar ratio , medicinal chemistry , proton nmr , catalysis , organic chemistry , urea
The reaction of unsymmetrical phenylmethyltin dihydride (PhMeSnH 2 ), phenylethyltin dihydride (PhEtSnH 2 ), phenylbutyltin dihydride (PhBuSnH 2 ) and butylmethyltin dihydride (BuMeSnH 2 ) with biuret (H 2 L) 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, 1 H NMR, 13 C NMR, 119 Sn 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.