Selective Dehydrocoupling of Phosphines by Lithium Chloride Carbenoids
作者:Sebastian Molitor、Julia Becker、Viktoria H. Gessner
DOI:10.1021/ja509381w
日期:2014.11.5
for the formation of phosphorus-phosphorus bonds through dehydrocoupling of phosphines is presented. The reaction is mediated by electronically stabilized lithium chloride carbenoids and affords a variety of different diphosphines under mild reaction conditions. The developed protocol is simple and highly efficient and allows the isolation of novel functionalized diphosphines in high yields.
Facile, Catalytic Dehydrocoupling of Phosphines Using β‐Diketiminate Iron(II) Complexes
作者:Andrew K. King、Antoine Buchard、Mary F. Mahon、Ruth L. Webster
DOI:10.1002/chem.201503399
日期:2015.11.2
Catalytic dehydrocoupling of primary and secondary phosphines has been achieved for the first time using an iron pre‐catalyst. The reaction proceeds under mild reaction conditions and is successful with a range of diarylphosphines. A proton acceptor is not needed for the transformation to take place, but addition of 1‐hexene does allow for turnover at 50 °C. The catalytic system developed also facilitates
[EN] PROCESS FOR PREPARING ACYLPHOSPHANES AND DERIVATIVES THEREOF<br/>[FR] PROCEDE DE PREPARATION D'ACYLPHOSPHANES ET DE DERIVES D'ACYLPHOSPHANES
申请人:CIBA SC HOLDING AG
公开号:WO2005014605A1
公开(公告)日:2005-02-17
The present invention relates to a new, selective process for the preparation of mono- and bisacylphosphanes of formula (I) n and m are each independently of the other 1 or 2; R1, if n = 1, is e.g. phenyl R1, if n = 2, is e.g. C1-C18alkylene or phenylene; R2 is e. g. C1-C18alkyl, phenyl or substituted phenyl; R3 is e. g. C1-C18alkyl, by (1) reacting a phosphorous halide of formula Ila or a phosphorous halide oxide of formula (Ilb) or a phosphorous halide sulfide of formula (IIc) with an alkali metal in a solvent in the presence of a proton source; (2) subsequent reaction with m acid halides of formula (III) An oxidation step may follow to obtain mono- and bisacylphosphane oxides or mono-and bisacylphosphane sulfides.
Metal-free Lewis acid mediated dehydrocoupling of phosphines and concurrent hydrogenation
作者:Roman Dobrovetsky、Katsuhiko Takeuchi、Douglas W. Stephan
DOI:10.1039/c4cc09526j
日期:——
The stoichiometric reaction of trityl cation with two equivalents of Ph2PH affords the phosphine stabilized phosphenium salt [Ph2(H)PPPh2][B(C6F5)4] via hydride abstraction, while catalytic amounts of B(p-HC6F4)3 effects catalytic phosphine dehydrocoupling with the liberation of H2.
Exploring the Reactivity of Donor-Stabilized Phosphenium Cations: Lewis Acid-Catalyzed Reduction of Chlorophosphanes by Silanes
作者:Kyle G. Pearce、Andryj M. Borys、Ewan R. Clark、Helena J. Shepherd
DOI:10.1021/acs.inorgchem.8b01578
日期:2018.9.17
Phosphane-stabilized phosphenium cations react with silanes to effect either reduction to primary or secondary phosphanes, or formation of P–P bonded species depending upon counteranion. This operates for in situ generated phosphenium cations, allowing catalytic reduction of P(III)–Cl bonds in the absence of strong reducing agents. Anion and substituent dependence studies have allowed insight into