Reaction of Boron Triflate with Polyfluoroolefins. Synthesis of Polyfluorinated Allyl Trifluoromethanesulfonates
摘要:
Terminal F-olefins (F designates perfluorinated molecules) react with boron triflate (1) to form corresponding allyl triflates RfCF=CFCF2OSO2CF3 in moderate yield. The reaction of F-pentene-2 is much slower, resulting in insertion of CF3SO2O into the CF3 group of fluorolefin. Mono- and dihydrofluorolefins were found to be more reactive toward 1. Both F-cylobutene and F-cyclopentene were converted into corresponding cyclic allyl triflates by reaction with 1, but F-cyclohexene was found to be resistant to the action of boron triflate. In contrast to terminal fluorolefins, both 5H,6H-F-n-decene-5 and 1H,1H-F-isobutene react with 1 without rearrangement;, producing corresponding allyl triflates in 47 and 63% yields, respectively.
The addition of R(3)SiCl to B(OTf)(3) gives ''supersirylating agents'' formulated as R(3)SiB(OTf)(3)Cl. The catalytic properties of these species are similar to those of the previously-described (but less accessible) R(3)SiB(OTf)(4). Copyright (C) 1996 Elsevier Science Ltd
Novel Cations and Molecules from Phosphaalkynes, 1H-Phosphirenes and from Tetraphosphacubane
作者:Kenneth K. Laali、Bernhard Geissler、Andreas Hoffmann、Wolfgang Fiedler、Thomas Mackewitz、Jürgen Simon、Sandro Hollenstein、Manfred Regitz
DOI:10.1080/10426509908546236
日期:1999.1.1
phosphaalkenes without direct observation of a long-lived cation. Reactions of RCP (R = tBu, 1-Ad) with “PhSeF” and with PhSeCl resulted in bis-phenylselenenylation and chlorophenylselenenylation respectively, forming novel Se-containing phosphaalkenes. Ionization of 1-H-triflato-phosphirene with B(OTf) 3 /SO2 led to the direct observation of a persistent phosphirenylium cation. The (CO)5 W-complexed phosphirenylium
通过在超酸性介质中动力学稳定的磷炔的低温质子化,生成和捕获(反离子)膦酰基阳离子(乙烯基阳离子的 P 类似物)导致形成相应的磷烯烃,而无需直接观察长寿命阳离子。RCP (R = tBu, 1-Ad) 与“PhSeF”和 PhSeCl 的反应分别导致双苯基硒基化和氯苯基硒基化,形成新型含硒磷烯烃。用 B(OTf) 3 /SO2 电离 1-H-triflato-phosphirene 导致直接观察到持久性 phosphirenylium 阳离子。随后从 (CO) 5 W 络合的三氟甲磺酸酯和三氟乙酸酯衍生物中生成 (CO) 5 W 络合的磷鎓阳离子。通过与强亲电试剂(即 MeOTf、
Preparation of Phenylalkyl Ethers and Phenyl Esters from Benzenediazonium Tetrafluoroborate with Alkoxytrimethylsilanes and Trimethylsilyl Esters
作者:George A. Olah、An-hsiang Wu
DOI:10.1055/s-1991-26419
日期:——
Sonication assisted reaction of benzenediazonium tetrafluoroborate with alkoxytrimethylsilanes and trimethylsilyl esters gives phenylalkyl ethers and phenyl esters, respectively, with trialkyl-(aryl) borates as byproducts. The scope of the reaction, experimental conditions and proposed mechanism are discussed.
The thermal cleavage of boron tris-trifluoromethane-sulfonate(triflate) and boron tris-pentafluoroethane-sulfonate(pentflate) to triflic (pentflic) anhydride and trifluoromethyl triflate (pentafluoroethyl pentflate)
作者:G.A. Olah、T. Weber、O. Farooq
DOI:10.1016/s0022-1139(00)82942-5
日期:1989.5
Cleavage of boron tris-trifluoromethanesulfonate(triflate) and boron tris-pentafluoroethanesulfonate(pentflate) was studied at 200°C. Complete cleavage giving borontrifluoride, sulfur dioxide, carbonyl fluoride (trifluoroacetyl fluoride), triflic (pentflic) anhydride, triflic (pentflic) triflate (pentflate) and boric acid was observed. A mechanism for the cleavage based on formation of the identified
Synthesis of a Doubly Complexed Bisphosphirenyl Ether and Generation of Phosphirenylium Cations Complexed with Pentacarbonyltungsten<sup>1</sup>
作者:Jürgen Simon、Uwe Bergsträsser、Manfred Regitz、Kenneth K. Laali
DOI:10.1021/om980723f
日期:1999.3.1
respectively, the bisphosphirenyl ether 4 with the strong Lewis acid boron tris(trifluoromethanesulfonate) leads to the corresponding salts 6 or 7 of the pentacarbonyltungsten-substituted phosphirenyliumcation.