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Crystal and molecular structure of 1,2:3,4-Di-O-isopropylidene-6-O-toluene-p-sulfonyl-α-d-galactopyranose: Ring conformations in Di-O-isopropylidenegalactopyranose systems

✍ Scribed by Janusz W. Krajewski; Przemysa̵w Gluziński; Zofia Urbańczyk-Lipkowska; Aleksander Zamojski; Giovanni Dario Andreetti; Gabriele Bocelli

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
691 KB
Volume
148
Category
Article
ISSN
0008-6215

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✦ Synopsis

1,2:3,4-Di-O-isopropylidene-6-O-toluene-p-s~fonyl-~-D-g~a~op~~ose has been investigated by X-ray diffraction methods. The crystals are orthorhombic, space group p2,2,2, (2 = 4) with cell dimensions a = 15.210( 2), b = 15.658(2), and c = 8.858(l) A. The structure was solved by direct methods and the atomic parameters were refined anisotropically against 1030 observed reflections by a fullmatrix, least-squares procedure giving R 0.039. The pyranoid ring has a twist ("T,) conformation. The 1,2-and 3,4-dioxolane rings were assigned the 3E and Vi conformations, respectively. Models of the di-0-isopropylidenegalactopyranose system with minimised strain energy were compared conformationally with several experimental structures containing the above ring systems.

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