60823-55-4Relevant academic research and scientific papers
Novel metal-free Lewis acid catalysis by phosphonium salts through hypervalent interaction
Terada, Masahiro,Kouchi, Mitsuhiro
, p. 401 - 409 (2007/10/03)
Phosphonium salts as a novel metal-free Lewis acid catalyst can be considered as organocatalysts. The introduction of a five-membered dioxaphosphacycle to the phosphonium salt is critical to its function as a Lewis acid catalyst for the Diels-Alder reacti
Cyclic-acyclic equilibrium and selective P-O bond cleavage in 2-hydroxyphenyldiphenyl-phosphinate, Ph2P(O)OC6H4OH
Segstro, Edward Paul,Davie, Kerry,Huang, Xiaoling,Janzen, Alexander Frank
, p. 518 - 521 (2007/10/03)
The equilibrium in the Ph2P(O)OC6H4OH-base system may be shifted by varying the base concentration, where base = imidazole, triethylamine, dimethyl sulfoxide, pyridine, and 1,4-dioxane. This equilibrium was studied by 31P and 1H NMR, and information about the symmetry of phosphorus-containing intermediates is provided by the 1H NMR spectrum of the catecholyl ring, with its ABCD spin system. The equilibrium is also affected by trifluoroacetic acid. A mechanism is proposed that involves protonation-deprotonation, cyclic-acyclic equilibria, and selective P-O bond cleavage, with all steps occurring rapidly on the NMR time scale.
SYNTHESE VON PHOSPHINSAEURE-o-HYDROXYPHENYLESTERN
Gloede, J.,Hauser, A.,Ramm, M.
, p. 245 - 250 (2007/10/02)
2-Chloro-2-oxo-benzo-1,3,2-dioxaphosphole 1 reacts with Grignard compounds to give o-hydroxyphenylphosphinates 2.The structure of 2a is determined by X-ray analysis, IR and NMR.Key words: Phosphinates; X-ray; IR; 31 P n.m.r.; hydrogen bridge linkage
