Crystal and Molecular Structures of Benzyl-(2-chloro-6-methylpyrimidin-4-yl)amine and Benzyl-(4-chloro-6-methylpyrimidin-2-yl)amine: Confirmation of Computationally Predicted Restricted Rotation
作者:Luke R. Odell、Adam McCluskey、Timothy W. Failes、Edward R. T. Tiekink
DOI:10.1007/s10870-007-9253-2
日期:2007.11.7
Crystal structures for the isomeric compounds benzyl-(2-chloro-6-methylpyrimidin-4-yl)amine (1), as its hemi-hydrate, and benzyl-(4-chloro-6-methylpyrimidin-2-yl)amine (2) have been determined. Conformational differences lead to multiple molecules, i.e. two and three, in their respective structures. Layers feature in each of the crystal structures and are stabilized by substantial hydrogen-bonding interactions. Compound (1) crystallizes as a hemi-hydrate in the triclinic space group P-1 with a = 8.667(5) Å, b = 11.421(7) Å, c = 12.954(8) Å, α = 78.330(10)°, β = 84.553(10)°, γ = 75.510(9)°, and Z = 4. Compound (2) crystallizes in the monoclinic space group P21/c with a = 10.740(3) Å, b = 21.487(6) Å, c = 14.914(4) Å, β = 95.014(5)°, and Z = 12. Substantial hydrogen-bonding interactions leading to layer structures feature in each of the crystal structures of the isomeric title compounds.
异构化合物苄基-(2-氯-6-甲基嘧啶-4-基)胺 (1) 及其半水合物,以及苄基-(4-氯-6-甲基嘧啶-2-基)胺 (2) 的晶体结构已经确定。构象差异导致它们各自的结构中存在多个分子,即两个和三个。每种晶体结构都具有层状特征,并由大量的氢键相互作用稳定。化合物 (1) 以半水合物的形式在三斜空间群 P-1 中结晶,其晶格参数为 a = 8.667(5) Å,b = 11.421(7) Å,c = 12.954(8) Å,α = 78.330(10)°,β = 84.553(10)°,γ = 75.510(9)°,Z = 4。化合物 (2) 在单斜空间群 P21/c 中结晶,其晶格参数为 a = 10.740(3) Å,b = 21.487(6) Å,c = 14.914(4) Å,β = 95.014(5)°,Z = 12。这两种异构标题化合物的晶体结构中均具有由大量氢键相互作用形成的层状结构。