In Situ preparation of mono- and dichloroboranes and their reactivity with olefins
作者:George Zweifel
DOI:10.1016/s0022-328x(00)83723-7
日期:1967.8
hydrogen to form monochloroborane. Dichloroborane is obtained when two moles of hydrogen chloride are reacted with one mole of borane. Hydroboration of 1-hexene with these reagents involves an anti-Markownikoff addition of the B-H bond to the olefin. Chloroboranes exhibit a markedly lower reactivity toward olefins as compared with borane or alkylboranes. The reaction of olefins with monochloroborane in a 1
The reaction of diborane with boron trichloride in the presence of ethers—The chloroborane etherates
作者:Herbert C. Brown、P.A. Tierney
DOI:10.1016/0022-1902(59)80010-5
日期:1959.1
Diborane does not react to any significant extent with borontrichloride in the absence of ethers. In the presence of ethers (dimethyl ether, diethyl ether, diglyme, tetrahydrofuran and tetrahydropyran) reaction readily occurs at room temperatures to form chloroborane etherates, as indicated by the equations: B2H6 + BCl3 + 3R2O → 3H2ClB·OR2B2H6 + 4BCl3 + 6R2O → 6HCl2B·OR2 These chloroborane etherates
Asymmetric Lewis Acid-Dienophile Complexation: Secondary Attraction versus Catalyst Polarizability
作者:Joel M. Hawkins、Stefan Loren、Mitch Nambu
DOI:10.1021/ja00084a005
日期:1994.3
support a two-point-binding chiral recognition mechanism for these asymmetricDiels-Aldercatalysts. As the arene moieties of the alkyldichloroborane Lewis acids are made more polarizable through the progression of phenyl to 3,5-dimethylphenyl to 3,5-dichlorophenyl to 3,5-dibromophenyl to naphthyl, the polar ester group of the boron-bound methyl crotonate is drawn in toward the arene of the catalyst due
手性路易斯酸-亲二烯体复合物的一系列五个 X 射线晶体结构支持这些不对称 Diels-Alder 催化剂的两点结合手性识别机制。由于烷基二氯硼烷路易斯酸的芳烃部分通过苯基到 3,5-二甲基苯基到 3,5-二氯苯基到 3,5-二溴苯基到萘基的进展而变得更加可极化,硼结合的巴豆酸甲酯的极性酯基团由于增强的偶极诱导偶极吸引力,被拉向催化剂的芳烃
Infrared Spectrum of Dichloroborane Produced by CO<sub>2</sub>Laser Enhanced Reaction
Infrared spectra of HBCl2 and DBCl2 produced by a TEA CO2 laser enhanced reaction of BCl3 and H2/D2 have been observed by an FT-IR spectrometer at a resolution of 0.12 cm−1. A detailed analysis has been carried out for the ν1 band of HBCl2 to obtain the precise molecular parameters, and they are compared with the microwave data. The fundamental frequencies other than the ν3 band have all been determined
由 TEA CO2 激光增强 BCl3 和 H2/D2 反应产生的 HBCl2 和 DBCl2 的红外光谱已被 FT-IR 光谱仪以 0.12 cm-1 的分辨率观察到。对HBCl2的ν1波段进行了详细分析,获得了精确的分子参数,并与微波数据进行了比较。ν3 频带以外的基本频率都已确定。这些频率数据与 ab initio MO 计算的结果相结合,通过最小二乘法得出了一般的对称力场。还讨论了 BCl3 和 H2 的 CO2 激光反应的一些特征。