with low selectivity and without formation of an intermediate, not via hydrometallation or σ‐bond metathesis. In the absence of donor solvents, hydrometallation is preferred but this is associated with inaccessibly high activation barriers at low temperatures. Donor solvents activate the aluminum hydride bond, lower the barrier for HDF significantly, and switch the product preference from Z to E. The
Abstract cis -1-Chloro-2-fluoroethylene was synthesized, and the gas-phase infrared spectrum was investigated in the ν 4 band region between 1321–1350 cm −1 , at a resolution of about 0.002 cm −1 , employing a tunable diode–laser spectrometer. This vibration of symmetry species A ′ gives rise to an a / b -hybrid band, even though our analysis pointed out that the intensity of the a -type component
摘要 合成了顺式-1-氯-2-氟乙烯,并在1321-1350 cm -1 之间的ν 4 波段区域研究了气相红外光谱,分辨率约为0.002 cm -1 ,采用可调二极管——激光光谱仪。尽管我们的分析指出 a 型分量的强度占主导地位,但对称物质 A ' 的这种振动会产生 a / b 混合带。大多数 J 和 K 结构在不同的子分支中得到解析,并且旋转振动分析导致分配了约 1900 个 a 型谱系,其中 J ≤ 71 和 K a ≤ 20 的 35 个 Cl 同位素物种。ν 4 基波受到弱科里奥利共振的局部扰动,并且发现了一些局部交叉;3ν 12 状态似乎是最可能的相互作用水平。使用 Watson'
作者:Thach T. Nguyen、Ming Joo Koh、Xiao Shen、Filippo Romiti、Richard R. Schrock、Amir H. Hoveyda
DOI:10.1126/science.aaf4622
日期:2016.4.29
show that kinetically E-selective cross-metathesis reactions may be designed to generate thermodynamically disfavored alkenyl chlorides and fluorides in high yield and with exceptional stereoselectivity. With 1.0 to 5.0 mole % of a molybdenum-based catalyst, which may be delivered in the form of air- and moisture-stable paraffin pellets, reactions typically proceed to completion within 4 hours at ambient
烯烃复分解中的 EZ 催化剂控制 自从被称为烯烃复分解的伙伴交换化学舞蹈获得诺贝尔奖以来已经过去了十年,并且不断出现独特的例程。通常,烯烃在 E 构型中最稳定,两个最大的取代基截然相反。然而,氯和氟取代基通常会逆转这种趋势,有利于交替的 Z 几何形状。阮等人。报道了一种钼复分解催化剂,配体经过精心优化,可以比更稳定的 Z 异构体更快地生产 Cl-和 F-取代的 E 烯烃。科学,这个问题 p。569 合理优化的钼催化剂可提供范围广泛的具有氯或氟取代基的烯烃。烯烃复分解的主要缺点,化学的几个分支研究的核心化学过程是缺乏有效的方法,在产物分布中动力学有利于 E 异构体。在这里,我们表明可以设计动力学 E 选择性交叉复分解反应,以高产率和出色的立体选择性生成热力学上不利的链烯基氯和氟化物。使用 1.0 至 5.0 摩尔 % 的钼基催化剂,其可以空气和湿气稳定的石蜡颗粒形式提供,反应通常在环境温度下
Trans-1-chloro-2-fluoroethylene: Microwave spectra and anharmonic force field
evaluated by numerical differentiation of the analytic second-order Moller-Plesset many-body perturbation theory/correlation consistent polarized valence triple zeta second derivatives. The anharmonic part of the force field completes the theoretical study on the equilibrium structure, dipole moment, chlorine quadrupolar tensor, and harmonic force field previously carried out by the same authors.
CO<sub>2</sub>Laser-induced Decomposition of 1,2-Dichloro-1-fluoroethane
作者:Hiroo Ogura、Takayuki Yano
DOI:10.1246/bcsj.58.1239
日期:1985.4
IRMPD is direct elimination of molecular HCl and HF, HCl elimination being predominant channel. Primary HCl elimination products cis-and trans-CHF=CHCl, and CH2=CFCl are formed at high vibrational levels, from which additional photon absorption occurs in the secondary photolysis to give rise to CH≡CCl, CH≡CF, and CH2=CHF. All of the secondary products are concluded to be derived from mainly CH2=CFCl