TY - JOUR
T1 - Crystal structures of two new anomeric 2,3-unsaturated C-glycopyranosides
AU - Boeyens, Jan C.A.
AU - Travlos, S. Don
AU - Engelbrecht, Gerhard J.
AU - Holzapfel, Cedric W.
AU - Kruger, Gert J.
PY - 1997/3
Y1 - 1997/3
N2 - The crystal structures of isopropylidene [4,6-di-O-acetyl-2,3-dideoxy-α-D-erythro-hex-2-eno-pyranosyl]- methylmalonate 1 and its β-anomer 2 have been determined by single-crystal X-ray diffraction. Both compounds crystallize with space group P21 and cell constants of 1: a, b, c = 10.635 (1), 8.102 (2), 11.212 (1)° β = 107.20 (1)° and 2: a, b, c = 9.995 (1), 10.230 (1), 10.105 (1) Å; β = 115.71 (1)°. The two compounds differ in stereochemistry only at the 1-position which confirms previous conclusions based on nmr spectroscopy. The cyclic fragments in the structures all have related conformations, close to envelope forms. The results confirm that Pd-catalyzed allylic substi-tution proceeds largely with retention of configuration.
AB - The crystal structures of isopropylidene [4,6-di-O-acetyl-2,3-dideoxy-α-D-erythro-hex-2-eno-pyranosyl]- methylmalonate 1 and its β-anomer 2 have been determined by single-crystal X-ray diffraction. Both compounds crystallize with space group P21 and cell constants of 1: a, b, c = 10.635 (1), 8.102 (2), 11.212 (1)° β = 107.20 (1)° and 2: a, b, c = 9.995 (1), 10.230 (1), 10.105 (1) Å; β = 115.71 (1)°. The two compounds differ in stereochemistry only at the 1-position which confirms previous conclusions based on nmr spectroscopy. The cyclic fragments in the structures all have related conformations, close to envelope forms. The results confirm that Pd-catalyzed allylic substi-tution proceeds largely with retention of configuration.
UR - http://www.scopus.com/inward/record.url?scp=0040564583&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0040564583
SN - 0379-4350
VL - 50
SP - 48
EP - 51
JO - South African Journal of Chemistry
JF - South African Journal of Chemistry
IS - 1
ER -