S. J. Garden, W. Harrison, R. Howie
Jan 30, 2001
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Journal
Journal of Organometallic Chemistry
Abstract
Abstract Methyl 4,6- O -benzylidene-2,3-bis- O -(Ph n Me 3− n SnCH 2 )-α- d -glucopyranosides, ( 3 : n =3; 4 : n =2; 5 : n =1), prepared from methyl 4,6- O -benzylidene-α- d -glucopyranoside ( 6 ) and Ph n Me 3− n SnCH 2 I, contain four co-ordinate tin centres in both solution and solid state. Whereas a single molecular arrangement is indicated in solution for 3 – 5 , evidence for several arrangements in the solid state was obtained for each compound from the 119 Sn- and 13 C-NMR spectra. An X-ray structure determination of 5 indicated the presence of three slightly differing molecular arrangements, and the absence of any intermolecular contacts. Assignments of the individual Sn signals in the solution NMR spectra of 3 and 5 to their attached CH 2 groups have been accomplished. The stannacyclic compound, methyl 4,6- O -benzylidene-2,3-bis- O -(2,2-diphenyl-2-stannapropylidene)-α- d -glucopyranoside ( 7 ) was similarly prepared from 6 , using Ph 2 Sn(CH 2 I) 2 .