将使用甲醇甲醇钠的氢交换反应速率k exch M -1 s -1与 四个9-Y苯基芴-9- i H,七个YC 6 H 4 C i的气相酸度ΔG kcal / mol进行比较。H(CF 3)2,七个YC 6 H 4 C i HClCF 3和C 6 F 5 iH.十四种氟化苄基化合物和五氟苯导致接近统一的实验性氢同位素效应,表明与交换过程相关的大量内部回流。尽管9-苯基芴的反应具有实验上的同位素效应,似乎在价值上是正常的,但它们不服从Swain-Schaad关系。这表明它们以少量的内部收益发生。苄基化合物的活化熵ΔS ‡为+12至+14 eu,与9-Y苯基芴基的活化熵ΔS ‡为-8至-12 eu。该Δ小号‡ 五氟苯反应的〜1 eu介于其他化合物之间。密度泛函计算使用B3LYP / 6-31 + G(d,p)的报告为CH的反应3 ø -(HOCH 3)3为C 6 ˚F 5 H,C 6 H ^ 5
Fluorinated phosphonium ylides: versatile in situ Wittig intermediates in the synthesis of hydrofluorocarbons
作者:Pinaki S. Bhadury、Meehir Palit、Mamta Sharma、Syed K. Raza、Devendra K. Jaiswal
DOI:10.1016/s0022-1139(02)00104-5
日期:2002.7
has been developed for the synthesis, characterisation and isolation of hydrofluoro/hydrohalofluorocarbons such as chlorodifluoromethane (CF2ClH), difluoromethane (CF2H2), bromodifluoromethane (CF2BrH) and dibromofluoromethane (CFBr2H) as possible chlorofluorocarbon (CFC) alternatives. The Wittig reaction of carbonyl compounds with in situ generated triphenylphosphonium ylides in DMF forms terminal fluoroolefins
已经开发了一种简单方便的技术来合成,表征和分离氢氟/氢卤代碳氢化合物,例如氯二氟甲烷(CF 2 ClH),二氟甲烷(CF 2 H 2),溴二氟甲烷(CF 2 BrH)和二溴氟甲烷(CFBr 2H)可能是氯氟烃(CFC)的替代品。羰基化合物与DMF中原位生成的三苯基phosph的Wittig反应形成末端氟代烯烃。但是,在不存在羰基部分的情况下,这些烷基化物会分解。在没有羰基部分的情况下,在DMF中氟亚甲基三苯基phosph的高反应活性已被首次用于设计氢氟烃的合成。
Palladium-catalysed difluoroolefination of benzyl tosylates toward the synthesis of <i>gem</i>-difluoro-2-trifluromethyl styrene derivatives
作者:Jie Xu、Jiangjun Liu、Gang Chen、Baojian Xiong、Xuemei Zhang、Zhong Lian
DOI:10.1039/d2ra02473j
日期:——
We have presented an efficient method to access gem-difluoro-2-trifluromethyl styrene derivatives via palladium catalysis. This method features mild reaction conditions, broad substrate scope and good product yields. Moreover, gram–scale reactions demonstrated the robustness and potential of this method. Control experiments revealed that the –CF3 group was essential to the success of this transformation
Exchange of halogen for fluorine in reactions of vicinal dihalopolyfluoroalkanes with cesium fluoride
作者:V. F. Cherstkov、S. A. Postovoi、D. T. Lantseva、S. R. Sterlin、Yu. V. Zeifman、L. S. German
DOI:10.1007/bf00960271
日期:1984.12
Fluoro olefins. I. Synthesis of .beta.-substituted perfluoro olefins
作者:Frank E. Herkes、Donald J. Burton
DOI:10.1021/jo01280a007
日期:1967.5
Efficient One Step Procedure for the Synthesis of α-Trifluoromethylated Arylacetates
作者:In Howa Jeong、Tae Won Park、Bum Tae Kim
DOI:10.1080/00397919808007172
日期:1998.6
The reaction of beta,beta-difluoro-alpha-trifluoromethylstyrene derivatives 1 with 3 equiv. of sodium methoxide in acetonitrile at 25 degrees C afforded alpha-trifluoromethylated arylacetates 3 in good yields.