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Redetermination of the crystal structure of khellin, 4,9-dimethoxy-7-methyl-5H-furo(3,2-g) (1)-benzopyran, C14H12O5

✍ Scribed by M. El-Kordy; Dr. I. S. Ahmed Farag; Professor G. Will

Publisher
John Wiley and Sons
Year
1988
Tongue
English
Weight
294 KB
Volume
23
Category
Article
ISSN
0232-1300

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✦ Synopsis

Redetermination of the Crystal Structure of Khellin, 4,9-dimethoxy-7-methyl-5H-furo(3,2-g) (1) -benzopyran,

C14H1205

The crystals of this compound are monoclinic with space group P2,/n. The unit cell parameters were derived from least squares fit of the angular data for 24 high angle reflections. The lattice parameters are: a = 11.550(2), b = 7.163(1), c = 14.426(2) A, , ! ? = 93.61(1)", z = 4. The structure of this compound was solved by direct methods and refined by full matrix least-squares with anisotropic factors t o R = 0.041. The refinement of the atomic parameters reflects the planarity of the molecule in the solid state. The molecules are connected by hydrogen bonds forming a zigzag chain parallel t o the El001 direction.

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## Abstract Two benzodiazepines, Diazepam and Flunitrazepam, labeled with carbon‐14 in position 5 of the diazepine ring have been synthesized. Use of a condensation between iminochlorides and ^14^C‐benzonitriles, followed by exhaustive methylation of the resulting quinazolines and hydrolyses is des