Acta Cryst. (2003). E59, o302-o303  [ doi:10.1107/S1600536803002988 ]

6-Methyl-11a,12-dihydro-6H-quino[3,2-b][1,4]benzothiazine: an amidine formed under unusual conditions

R. L. Luck, K. Li and D. K. Bates

Abstract: The crystal structure determination of the title compound, C₁₆H₁₄N₂S, confirms the amidine nature of this reaction product. In N,N'-diphenylamidines both phenyl groups are nearly orthogonal with the N-C(-C)=N grouping, whereas in this constrained amidine the benzene groups are substantially less twisted [C-C-N-C torsion angles = -17.2  (7) and 38.1  (6)°]. The result is a slightly cupped molecule with the ring-fused benzene rings appearing like the extended wings of a butterfly. The S-C distances of 1.807  (4) and 1.760  (5)  Å are significantly different, with the shorter distance representing the S-C bond to a benzene ring.

Online 14 February 2003

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