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首页> 外文期刊>Journal of chemical crystallography >Synthesis and crystal structures of N,N′-disubstituted piperazines
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Synthesis and crystal structures of N,N′-disubstituted piperazines

机译:N,N'-二取代哌嗪的合成及晶体结构

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The structure of 1,4-diphenylpiperazine (1) was determined; it crystallized in the orthorhombic space group Pbca, a = 8.6980(7), b = 8.4287(7), c = 17.6359(15), V = 1292.94(19), Z = 4. Three novel N,N′-disubstituted piperazines were synthesized via reductive amination of piperazine or N-diphenylmethylpiperazine. The products were characterized by NMR and X-ray crystallography. 1,4-Diphenethylpiperazine (2) crystallized in the monoclinic space group C2/c, a = 17.9064(13), b = 6.2517(5), c = 14.9869(11), β = 90.613(4), V = 1677.6(2), Z = 4. 1-Benzhydryl-4-benzylpiperazine (3) crystallized in the monoclinic space group Pn, a = 5.9450(2), b = 19.0722(4), c = 8.6084(2), β = 96.4600(10), V = 98.1790(10), Z = 2. 1-Benzhydryl-4- (pyridin-2-ylmethyl)piperazine (4) crystallized in the monoclinic space group P2/c, a = 13.5637(2), b = 5.82170(10), c = 24.0645(4), β = 90.613(4), V = 1888.16(5), Z = 4. Comparison of the structures showed significant sp ~2 character for the piperazine nitrogen atoms in 1. Each structure showed multiple intermolecular non-bonding interactions.
机译:确定了1,4-二苯基哌嗪(1)的结构;它在正交空间群Pbca中结晶,a = 8.6980(7),b = 8.4287(7),c = 17.6359(15),V = 1292.94(19),Z =4。三种新颖的N,N'-二取代哌嗪通过哌嗪或N-二苯基甲基哌嗪的还原胺化而合成。产物通过NMR和X射线晶体学表征。在单斜空间群C2 / c中结晶的1,4-二苯乙基哌嗪(2),a = 17.9064(13),b = 6.2517(5),c = 14.9869(11),β= 90.613(4),V = 1677.6( 2),Z = 4.在单斜空间群Pn中结晶的1-苯甲基-4-苄基哌嗪(3),a = 5.9450(2),b = 19.0722(4),c = 8.6084(2),β= 96.4600( 10),V = 98.1790(10),Z =2。在单斜空间群P2 / c中结晶的1-苯甲基-4-(吡啶-2-基甲基)哌嗪(4),a = 13.5637(2),b = 5.82170(10),c = 24.0645(4),β= 90.613(4),V = 1888.16(5),Z =4。结构比较表明,哌嗪氮原子在1中具有明显的sp〜2特征。每种结构表现出多种分子间的非键相互作用。

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