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we have recently synthesized ti(bh4)3(thf)3 and v(bh4)2(tmeda)2 complexes. the reaction of ticl3(thf)3 with nabh4 in dry thf gave flat blue crystals, ti(bh4)3(thf)3. the reaction of vcl3 with nabh4 in presence of n, n, n', n'- tetramethylethylenediamine, tmeda, produced violet crystals, v(bh4)2(tmeda)2. vibrational and magnetic properties of ti(bh4)3(thf)3 and v(bh4)2(tmeda)2 have been studied.

an efficient synthesis of some novel coumarin derivatives via 1, 4- michael addition of indole to coumarin chalcones catalyzed by cellulose sulphonic acid (csa) under solvent free conditions is described. the corresponding michael addition products were obtained in good to excellent yield. the synthesized compounds were screened for their antibacterial activity against e. coli, s. aureus and an...

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synthesis of some new monocyclic β-lactams containing a quaternary carbon center via a [2+2]cycloaddition reaction is described. the reaction of achiral diphenyl ketene with chiral aldimines derivedfrom chiral 2, 3, 4, 6-tetra-o-acetyl-β-d-galactopyranosylamine, 2, 3, 4, 6-tetra-o-acetyl-β-dglucopyranosylamine and different benzaldehydes resulted in the formation of β-lactams as singlediastereo...