- Branch-selective, Iridium-catalyzed hydroarylation of monosubstituted alkenes via a cooperative destabilization strategy
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Highly branch-selective, carbonyl-directed hydroarylations of monosubstituted alkenes are described. The chemistry relies upon a cationic Ir(I) catalyst modified with an electron deficient, wide bite angle bisphosphine ligand. This work provides a regioisomeric alternative to the Murai hydroarylation protocol.
- Crisenza, Giacomo E. M.,McCreanor, Niall G.,Bower, John F.
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supporting information
p. 10258 - 10261
(2014/08/05)
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- A new method for the synthesis of dichlorophosphines
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A new method for the synthesis of alkyldichlorophosphines by chlorination of alkylphosphines with phosphorus pentachloride under mild conditions is described.
- Tavtorkin, Alexander N.,Toloraya, Sofia A.,Nifant'Ev, Eduard E.,Nifant'Ev, Ilya E.
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supporting information; experimental part
p. 824 - 825
(2011/03/18)
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- Preparation of polyfunctional phosphines using zinc organometallics
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The reaction of functionalized diorganozincs with chlorodiorganophosphines provides polyfunctional phosphines in good yields. Especially attractive is the hydroboration/boron-zinc exchange sequence which allows the conversion of functionalized olefins into polyfunctional phosphines in a one-pot procedure. Several new chiral phosphines have been prepared starting from readily available chiral olefins (terpenes) and their efficiency in asymmetric hydrogenation reactions has been evaluated.
- Langer, Falk,Puentener, Kurt,Stuermer, Rainer,Knochel, Paul
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p. 715 - 738
(2007/10/03)
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- ZUR KENNTNIS DER ORGANOPHOSPHORVERBINDUNGEN XX. Bifunktionelle Aminophosphane (Et2N)2P-n-P(NEt2)2 und Et2N(R)P-n-P(R)NEt2
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Bifunctional aminophosphanes (Et2N)2P-n-P(NEt2)2 (n = 1-10) (1) and Et2NP(R)-n-P(R)NEt2 (n = 2-4, R = Alkyl, Ph) (2), which are valuable intermediates in organophosphorus synthesis, are obtained by two methods.Because of the marked nucleophility of phosphorus in 1 and 2, reactions with Lewis acids take place very smoothly as is shown by preparation of (Et2N)2P(X)-4-(X)P(NEt2)2 (X = O, S, Se, Te, BH3, BBr3) and 4-(CH3)P(NEt2)2>2+2I-.Fission of P-N bonds by PCl3, MeOH, H2S and CS2 affords Cl2P-4-PCl2, (MeO)2P-4-P(OMe)2, (MeO)Et2NP-4-PNEt2(OMe), the dithiophosphinate 4-(H)PS2>2-2 Et2NH2+, and the dithiocarbaminate 2P-4-P2.The 31P/1H/NMR-Spectra are discussed especially with regard to steric aspects in the synthesis of the chiral compounds 2 and their derivatives.
- Diemert, Klaus,Kuchen, Wilhelm,Kutter, Juergen
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p. 155 - 164
(2007/10/02)
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