The synthesis of 1, 4-dihydro-4-oxo-2, 5, 11-trimethy1-6H-pyrido [3, 2-2b] carbazole was described and the lactam-lactim tauromerism was discussed. C18H16N2O crystallizes in space group P21/c with Dm=1.30 (2) Mg·m-3 in acetonitrile with a=16.179 (4), b=14.900 (3). c=12.702 (3) Å, β=112.28 (2), V=2833.6 Å3, Z=8. The crystalstructure was investigated by X-ray diffraction method with final R=0.04 for 2355 independent reflections. In the two molecules, the lactam form was observed while the lactim for was found with many derivatives as well in solid state as in solution. The carbazole ring is planar while the 1, 4- dihydro-4-oxo-pyridine deviates from planarity. The molecules have rather small overlapping and the molecular packing involves many hydrogen bonds.
介绍了 1,4-二氢-4-氧代-2,5,11-三甲基 1-6H-
吡啶并[3,2-2b]
咔唑的合成,并讨论了内酰胺-内酰胺的牛磺酰构。
C18H16N2O 在空间群 P21/c 中结晶,
乙腈中 Dm=1.30 (2) Mg-m-3,a=16.179 (4),b=14.900 (3),c=12.702 (3) Å,β=112.28 (2),V=2833.6 Å3,Z=8。晶体结构采用 X 射线衍射法进行研究,2355 个独立反射的最终 R=0.04 。在这两种分子中,观察到了内酰胺形式,而在固态和溶液中发现了许多衍
生物的内酰胺形式。
咔唑环是平面的,而 1,4-二氢-4-氧代
吡啶则偏离平面。这些分子的重叠度相当小,分子排列涉及许多氢键。