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The structures of the [eta]6-tricarbonylchromium complexes of four methyl 4,6-O-benzylidene-[alpha]-glucopyranosides, (2)-(5), have been determined, as well as that of the free monosaccharide, (1). These compounds are (R)-methyl 2,3-di-O-methyl-4,6-O-benzylidene-[alpha]-D-glucopyranoside [(1), C16H22O6], tricarbonyl{(R)-methyl 2,3-di-O-methyl-4,6-O-([eta]6-benzylidene)- [alpha]-D-glucopyranoside}chromium(0) {(2), [Cr(C16H22O6)(CO)3]}, tricarbonyl{(R)-methyl 2,3-di-O-methyl-4,6-O-[(1R,2S)-2-methylthio-[eta]6- phenylmethylene]-[alpha]-D-glucopyranoside}chromium(0) {(3), [Cr(C17H24O6S)(CO)3]}, tricarbonyl{(R)-methyl 2,3-di-O-methyl-4,6-O-[(1R,2S)-2-diphenylphosphino-[eta]6-phenylmethylene]-[alpha]-D-glucopyranoside}chromium(0) dichloromethane solvate {(4), [Cr(C28H31O6P)(CO)3].CH2Cl2} and tricarbonyl[(R)-methyl 2,3-di-O-methyl-4,6-O-(4-methoxy-[eta]6-phenylmethylene)-[alpha]-D-glucopyranoside]chromium(0) {(5), [Cr(C17H24O7)(CO)3]}. These structural studies were undertaken to establish the solid-state conformation of the complexed arene ring in the 4,6-O-benzylidene and the 4,6-O-p-methoxyphenylmethylene [eta]6-Cr(CO)3 complexes, and also the absolute stereochemistry of some ortho-substituted derivatives of the 4,6-O-benzylidene complex.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks 1, 2, 3, 4, 5, global

fcf

Structure factor file (CIF format)
Contains datablock 1

fcf

Structure factor file (CIF format)
Contains datablock 2

fcf

Structure factor file (CIF format)
Contains datablock 3

fcf

Structure factor file (CIF format)
Contains datablock 4

fcf

Structure factor file (CIF format)
Contains datablock 5

CCDC references: 130532; 130533; 130534; 130535; 130536

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