2-O-Benzhydryl-3,4-(S)-O-benzylidene-d-lyxono-1,4-lactone
نویسندگان
چکیده
X-ray crystallography unequivocally showed that protection of the free hydroxyl group of 3,5-O-benzyl-idene-d-lyxono-1,4-lactone with diphenyl-diazo-methane proceeded with retention of configuration to give the title compound, C(25)H(22)O(5). The crystal structure consists of layers of inter-locked mol-ecules lying parallel to the a axis.
منابع مشابه
2-O-Benzhydryl-3,4-(S)-O-benzylidene-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 lactone, the isomeric xylono lactone has two mol-ecules present in the asymmetric unit (Z' = 2). The 5...
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متن کاملThe concomitant crystallization of two polymorphs of 1-deoxy-alpha-D-tagatose.
The crystalline form of 1-deoxy-D-tagatose, C6H12O5, is shown to be 1-deoxy-alpha-D-tagatopyranose; the absolute configuration is determined by use of D-lyxono-1,4-lactone as the starting material. The title compound crystallized as concomitant polymorphs from a mixture of ethyl actate and methanol. Although the melting points of the materials differ by 7 K, the molecular conformations are almo...
متن کامل2-C-Phenylerythrono-1,4-lactone
THE TITLE COMPOUND (SYSTEMATIC NAME 3,4-dihydr-oxy-3-phenyl-furan-2-one), C(10)H(10)O(4), features a five-membered γ-lactone ring with an envelope conformation at the C atom carrying the hydr-oxy group without the phenyl substituent. In the crystal, supra-molecular chains mediated by O-H⋯O hydrogen bonding are formed along the a-axis direction. These are consolidated in the crystal structure by...
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عنوان ژورنال:
دوره 64 شماره
صفحات -
تاریخ انتشار 2008