B-HALOGENATION OF AMMONIA-BORANE - NUCLEAR MAGNETIC-RESONANCE STUDY

被引：14

作者：

HU, MG ^{[1
]}

GEANANGEL, RA ^{[1
]}

机构：

[1] UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77004

来源：

INORGANIC CHEMISTRY | 1979年 / 18卷 / 12期

关键词：

D O I：

10.1021/ic50202a003

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Ammonia-borane and BX3 (X = F, Cl, Br) were combined at low temperature in molar ratios from 3:1 to 1:2 with ether solvents. After warming and stirring of the mixtures at 25 °C for 18 h, NMR samples were taken of each reaction mixture. The 11B spectra of products from the H3N >BH3-BCl3 reactions gave evidence for the new compounds H3N-BH2Cl and H3N-BHCl2 along with H3N-BCl3, (C2H5)2O-BH2Cl, and (C2H5)O-BHCl2. In the case of the BBr3 reactions, products identified from their spectra include H3N-BH2Br, (C2H5)2OBH2Br, and (C2H5)2OBHBr2 along with ether cleavage products. A hydrogen-halogen exchange mechanism appeared to account satisfactorily for the products of the BCl3 and BBr3 reactions. The only major products from the H3N-BH3-BF3 reactions were H3N-BF3 and μ-H2N)B2H5. An acid displacement followed by a hydrogen elimination mechanism is proposed for the BF3 reaction. © 1979, American Chemical Society. All rights reserved.

引用

页码：3297 / 3301

页数：5

共 30 条

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