5699-82-1Relevant articles and documents
Reactions of N-alkyl- and N-aryltrihalogenoacetamides with phosphorus pentachloride
Sinitsa,Shalimov,Nesterenko,Malenko
, p. 752 - 757 (2005)
In the study of reactions of N-alkyl- and N-aryltrihalogenoacetamides with PCl5, it was demonstrated for the first time that 3-alkyl(aryl)-2,2,2,4 tetrachloro-4-trihalomethyl-1,3,2-λ5- oxazaphosphetanes are intermediates in the synth
New hydrogen-bonding organocatalysts: Chiral cyclophosphazanes and phosphorus amides as catalysts for asymmetric Michael additions
Klare, Helge,Neudoerfl, Joerg M.,Goldfuss, Bernd
supporting information, p. 224 - 236 (2014/02/14)
Ten novel hydrogen-bonding catalysts based on open-chain PV-amides of BINOL and chinchona alkaloids as well as three catalysts based on rigid cis-PV-cyclodiphosphazane amides of N1,N1-dimethylcyclohexane-1,2-diamine have been developed. Employed in the asymmetric Michael addition of 2-hydroxynaphthoquinone to β-nitrostyrene, the open-chain 9-epi-aminochinchona-based phosphorus amides show a high catalytic activity with almost quantitative yields of up to 98% and enantiomeric excesses of up to 51%. The cyclodiphosphazane catalysts show the same high activity and give improved enantiomeric excesses of up to 75%, thus representing the first successful application of a cyclodiphosphazane in enantioselective organocatalysis. DFT computations reveal high hydrogen-bonding strengths of cyclodiphosphazane PV-amides compared to urea-based catalysts. Experimental results and computations on the enantiodetermining step with cis-cyclodiphosphazane 14a suggest a strong bidentate H-bond activation of the nitrostyrene substrate by the catalyst.
Metal complexes of phosphorus compounds including indigoid structure: Synthesis, characterization, and biological study
Abd El-Wahab, Zeinab H.,Faheim, Abeer A.
body text, p. 341 - 361 (2009/10/02)
Interaction of hexachlorocyclodiphosph(V)azanes, (Ia-h) with 5,5′ indigodisulfonic acid disodium salt (II) furnished the expected cyclodiphosph(V)azanes of the type (H2L1-H 2L8). The coordinating beha