2-O-Benzhydryl-3,4-(S)-O-benzyl-idene-d-xylono-1,4-lactone.

2-O-Benzhydryl-3,4-(S)-O-benzyl-idene-d-xylono-1,4-lactone.

X-ray crystallography unequivocally shows that protection of the free hydroxyl group of 3,5-O-benzyl-idene-d-xylono-1,4-lactone with diphenyl-diazo-methane proceeded smoothly to give the title compound, C(25)H(22)O(5), with no accompanying epimerization. Unlike the analogously protected lyxono lacto...

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Hlavní autoři: Jenkinson, S, Rule, S, Booth, K, Fleet, G, Watkin, D, Petursson, S
Médium: Journal article
Jazyk:English
Vydáno: 2008
Popis
Shrnutí:X-ray crystallography unequivocally shows that protection of the free hydroxyl group of 3,5-O-benzyl-idene-d-xylono-1,4-lactone with diphenyl-diazo-methane proceeded smoothly to give the title compound, C(25)H(22)O(5), with no accompanying epimerization. Unlike the analogously protected lyxono lactone, the isomeric xylono lactone has two mol-ecules present in the asymmetric unit (Z' = 2). The 5-ring lactones adopt envelope conformations and the 6-ring ketals adopt chair conformations.

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