Chlorobis(pentafluoroethyl)phosphane: Improved Synthesis and Molecular Structure in the Gas Phase
作者:Stuart A. Hayes、Raphael J. F. Berger、Norbert W. Mitzel、Julia Bader、Berthold Hoge
DOI:10.1002/chem.201003048
日期:2011.3.28
low‐frequency vibrational modes and therefore large‐amplitude motions. The conformer calculated to be most stable was also found to be most abundant by GED and comprised 61(5) % of the total. The molecular structure parameters determined by GED were in good agreement with those calculated at the MP2/TZVPP level of theory; the only significant difference was a discrepancy of about 3° in the C‐P‐C angle, which
(C 2 F 5)2 PC1现在可以通过从技术产品(C 2 F 5)3 PF 2开始的显着改进的合成方案访问。(C 2 F 5)3 PF 2的第一步是在120°C的无溶剂反应中用NaBH 4还原。用过量的氢氧化钠水溶液处理产物P(C 2 F 5)3,得到相应的次膦酸盐Na +(C 2 F 5)2PO -选择下五氟乙烷的解放。随后用PhPCl 4氯化导致(C 2 F 5)2 PCl选择性形成,通过分步冷凝将其分离,总产率为66%。(C 2 F 5)2的气体电子衍射(GED)图记录了PC1,并发现它由两个一致性模型进行描述。对势能表面的量子化学研究表明,可能存在许多低能构象体,每个构象体都有许多低频振动模式,因此具有大振幅运动。通过GED还发现,计算出的最稳定的构象异构体最丰富,占总数的61(5)%。通过GED测定的分子结构参数与在理论上在MP2 / TZVPP水平上计算的参数相吻合。唯一的显