2206-48-6Relevant articles and documents
Selective Transformation of Strychnine and 1,2-Disubstituted Benzenes by C–H Borylation
Itami, Kenichiro,Saito, Yutaro,Segawa, Yasutomo,Yamanoue, Kotono
supporting information, p. 985 - 993 (2020/04/10)
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Bismuth Perfluoroalkylphosphinates: New Catalysts for Application in Organic Syntheses
Solyntjes, Sven,Neumann, Beate,Stammler, Hans-Georg,Ignat'ev, Nikolai,Hoge, Berthold
, p. 1568 - 1575 (2017/02/10)
Commercially available BiPh3was treated with perfluoroalkylphosphinic acids [for example, (C2F5)2P(O)OH] to generate novel, highly Lewis acidic bismuth(III) perfluoroalkylphosphinates of the type PhxBi[RF2PO2]3?x(x=0, 1, 2) (RF=-C2F5, -C4F9). The first bismuth(V) perfluoroalkylphosphinate, Ph3Bi[(C2F5)2PO2]2, was synthesized from Ph3BiCl2and Ag[(C2F5)2PO2]. Examples for the successful application of the catalytically active bismuth(III) and bismuth(V) phosphinates in carbon–carbon bond forming reactions, such as Friedel–Crafts acylation and alkylation, Diels–Alder, Strecker and Mannich reaction, are presented.
Sterically congested phosphonium borate acids as effective Br?nsted acid catalysts
Sinha, Arup,Jaiswal, Amit K.,Young, Rowan D.
, p. 36 - 43 (2016/12/06)
Phosphonium borate acids [HPPh2(C6F5)][B(C6F5)4] (2), [HPMes2(C6F5)][B(C6F5)4] (3) and [HPMes(C6F5)2][B(C6F5)4] (4) were synthesized via heterolytic dihydrogen cleavage in the presence of triisopropylsilylium and characterized by spectroscopic and crystallographic methods. Br?nsted acid catalysis using compounds 2–4 proved to be efficient for a number of challenging reactions (namely ionic hydrogenation, hydroamination and hydroarylation), owing to the restrained nucleophilicity of the sterically hindered conjugate bases. Reactivity of compounds 2–4 suggests that their pKavalues are similar to that of diethyl oxonium acid.
