连续CO2激光引发的1,1-二氟乙烷与氯的反应

本文报道了CW-CO2激光引发的CF2HCH3与Cl2的反应.除主要产物CF2=CH2外,还有CF2ClCH3. CF2ClCH2Cl. CF2=CHCl. CF2=CCl2和CF2Cl2.为了探索应用激光方法合成CF2=CH2的可能性,研究了激光输出功率. 照射时间. 反应体系中CF2HCH3与Cl2的比例及样品压力对CF2=CH2得率的影响.同时为了探讨反应机理,还进行了TEA-CO2激光引发CF2HCH3加Cl2实验和CW-CO2激光作用下CF2=CH2. CF2=CH2加Cl2的反应研究,令人感兴趣的是在激光照射CF2=CH2时,发现了双键的断裂.

The CW-CO2 laser induced reaction of 1,1-difluoroethane with chlorine

The CW-CO2 laser induced reaction of CF2HCH3 (I) with Cl2 yields vinylidene fluoride (II) as the main product; other products are CH3CF2Cl, CF2ClCH2Cl, CF2:CHCl, CF2:CCl2 and CF2Cl2. The yield dependence of II on CF2HCH3/Cl2 ratio, the laser irradiation time, the laser power and the pressure of the gaseous reactants have been investigated. Furthermore, the TEA-CO2 laser induced reaction of I with Cl2, the CW-CO2 laser induced reaction of II and II with Cl2 have also been studied in order to gain more mechanistic insights for this complicated reaction system. Apparently, CF2ClCH3 but not CF2HCH2Cl, is the main precursor to II. Interestingly, the relatively strong double bond of CF2:CH2 can be broken by laser irradiation The possibility of applying this laser methodol. to the production of vinylidene fluoride has been discussed.