X-ray structure of 6-phenyldiquino[3,2-b;5,6-b′] [1,4]thiazine

Abstract

The title compound (C24H15N3S) is monoclinic, with a = 10.816(1), b = 8.193(1), c = 10.892(1), β = 104.20(1)° and space group P21. The molecule is folded with the central ring in a boat conformation. It can also be considered as folded around the C—C axis between the thiazine and pyridine rings. The butterfly folding angle between the two quinoline planes is 20.5(1)° and between the planes of the two halves of the thiazine ring is 30.6(1)°. The phenyl substituent is in an equatorial location with respect to the thiazine ring with the C—N···S angle of 163.0(2)°. The phenyl plane nearly bisects the pentacyclic ring system and is nearly perpendicular to the C(2), C(3), C(12), C(13) plane.