J. Krajewski, Z. Urbańczyk-Lipkowska, P. Gluziński
Jul 1, 1990
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Journal
Carbohydrate Research
Abstract
Abstract The crystals of a 4:1 mixture of 6-( N -benzyl- N - tert -butoxycarbonylamino)-2,3,6,7-tetradeoxy-α- dl - erythro - and -β- dl - threo -hept-2-enopyranos-4-ulose were monoclinic, space group P 2 1 / c , with cell dimensions: a = 9.490(2), b = 21.516(5), c = 10.279(2) A, β = 115.31(1)°, Z = 4. The ulose ring had a half-chair conformation deformed towards the sofa (envelope) form.