Molecular structure in the solid state (X-ray crystallography) and in solution (<sup>1</sup>H and<sup>13</sup>C nuclear magnetic resonance spectroscopy) of 1,3-diazetidines and pentasubstituted biguanides. X-Ray molecular structure of 2,4-bis-(6-methyl-3-methylthio-5-oxo-4,5-dihydro-1,2,4-triazin-4-yl)-5,5-pentamethylene-1,3-diphenylbig anide and 1,3-bis-(p-chlorophenyl)-5-dimethylamino-2,4-bis-(6-methyl-3-methylthio-5-oxo-4,5-dihydro-1,2,4-triazin-4-yl)biguanide
作者:Rosa Ma Claramunt、María de la Concepción Foces-Foces、Félix Hernández Cano、Alain Fruchier、Pedro Molina、Mateo Alajarín、Carmen López Leonardo、José Elguero
DOI:10.1039/p29900001859
日期:——
The molecular structures of a hexa- and a penta-substituted biguanide have been solved by X-ray crystallography: compound (9c) disubstituted at N(5) by (as) a piperidine ring, and compound (11b) monosubstituted at N(5) by a dimethylamino group. The X-ray structures can be used to explain the 1H and 13C NMR behaviour observed for these and related compounds. Consideration of the intramolecular hydrogen
六取代和五取代的双胍的分子结构已通过X射线晶体学解决:化合物(9c)在N(5)被哌啶环二取代,化合物(11b)在N(5)单取代)由二甲氨基基团。X射线结构可用于解释这些化合物和相关化合物的1 H和13 C NMR行为。考虑到NH和CO基团之间的分子内氢键对于确定双胍的结构和光谱性质是必不可少的。此外,前体二氮杂环丁烷也已通过NMR光谱学进行了研究:Z,Z-异构体始终是最丰富的,但可以观察到E,E-异构体的数量较少。