Tricarbonylchromium complexes of four methyl 4,6-O-[(η6-phenyl)alkylidene]-α-D-glucopyranosides

Article abstract of DOI:10.1107/S0108270199007313

The crystal structures of the chiral non-racemic η⁶-tricarbonylchromium complexes of three methyl 4,6-O-benzylidene-α-D-glucopyranosides, (1)-(3), have been determined, as well as that of the 4,6-O-acetal, (4), derived from acetophenone. These compounds are tricarbonyl{(R)-methyl 2,3-di-O-methyl-4,6-O-[(1S,3R)-(η ⁶-3-trimethylsilylphenyl)methylene]-α-D-glucopyranoside} chromium(0), (1), [Cr(C₁₉H₃₀O₆Si)(CO)₃], tricarbonyl{(R)-methyl 2,3-di-O-methyl-4,6-O-[(1S,2R)-(η ⁶-2-trimethylsilylphenyl)methylene]-α-D-glucopyranoside} chromium(0), (2), [Cr(C₁₉H₃₀O₆Si)(CO)₃], tricarbony1{(R)-methyl 2,3-O-(1-methylethylidene)-4,6-O-[(η ⁶-phenyl)methylene]-α-D-glucopyranoside}chromium(0), (3), [Cr(C₁₇H₂₂O₆)(CO)₃], and tricarbonyl{(S)-methyl 2,3-di-O-methyl-4,6-O-[(η ⁶-1-phenyl)ethylene]-α-D-glucopyranoside}chromium(0), (4), [Cr(C₁₇H₂₄O₆)(CO)₃].