title: X-ray and conformational investigations of a 4:1 mixture of 6-(N-benzyl-N-tert-butoxycarbonylamino)-2,3,6,7-tetradeoxy-alpha- DL-ery thro- and -beta-DL-threo-hept-2-enopyranos-4-uloses.
abstract: The crystals of a 4:1 mixture of 6-(N-benzyl-N-tert-butoxycarbonylamino)-2,3,6,7-tetradeoxy-a-DL-er ythro- and -beta-DL-threo-hept-2-enopyranos-4-ulose were monoclinic, space group P2(1)/c, with cell dimensions: a = 9.490(2), b = 21.516(5), c = 10.279(2) A, beta = 115.31(1) degrees, Z = 4. The ulose ring had a half-chair conformation deformed towards the sofa (envelope) form.
authors.affiliation: Institute of Organic Chemistry, Polish Academy of Sciences, Warsaw.
authors.forename: J W
authors.initials: JW
authors.lastname: Krajewski
authors.forename: Z
authors.initials: Z
authors.lastname: Urbańczyk-Lipkowska
authors.forename: P
authors.initials: P
authors.lastname: Gluziński
authors.forename: J
authors.initials: J
authors.lastname: Jurczak
authors.forename: J
authors.initials: J
authors.lastname: Raczko
authors.forename: A
authors.initials: A
authors.lastname: Gołebiowski
mesh_terms: D000606:Amino Sugars; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D008969:Molecular Sequence Data; D015394:Molecular Structure; D014961:X-Ray Diffraction
chemical_list: D000606:Amino Sugars; C066032:6-(N-benzyl-N-tert-butoxycarbonylamino)-2,3,6,7-tetradeoxyhept-2-enopyranose-4-ulose