29138-97-4Relevant academic research and scientific papers
Hydrogen phosphates: Self initiated organocatalysts for the controlled ring-opening polymerization of cyclic esters
Malik, Payal,Chakraborty, Debashis
, p. 32 - 41 (2013/07/19)
A series of arylhydrogenphosphates and aryldihydrogenphosphates was synthesized and characterized using spectroscopic methods and single crystal X-ray diffraction. These compounds were assessed as catalysts towards the ring-opening polymerization and proved to be potent organocatalysts for the ring-opening polymerization of cyclic esters. The bulk polymerizations were performed in the absence of external initiator. The polymerization proceeds in a controlled fashion which leads to well defined polyesters with narrow molecular weight distributions. In the post polymerization experiments, kinetics, mechanism and monomer concentration effects were investigated. The kinetic results have confirmed the pseudo-living character of the polymerizations and mechanistic studies suggest that the polymerization operates through a cationic mechanism.
PHOTOLYSIS OF ARYL ESTERS OF TRI- AND TETRACOORDINATED PHOSPHORUS COMPOUNDS
Shi, Min,Yamamoto, Kiichi,Okamoto, Yoshiki,Takamuku, Setsuo
, p. 1 - 14 (2007/10/02)
Upon UV excitation in methanol, some diaryl esters of alkly- or alkenyl phosphonates underwent an elimination of two aryl groups to give biaryls and the corresponding alkyl- or alkenylphosphonic acids.Tris(4-methoxyphenyl) phosphite also underwent a similar elimination to give 4,4'-dimethoxybiphenyl and 4-methoxyphenyl phosphonate.This interesting biaryl elimination was confirmed to proceed via a singlet intramolecular excimer by means of fluorescence spectra and Stern-Volmer analysis.
CATALYTIC EFFECT OF SUBSTITUTED DIPHENYLPHOSPHORIC ACIDS ON THE FORMATION OF ESTERS
Zhil'tsov, N. P.,Semenyuk, G. V.,Korzhenevskaya, N. G.
, p. 825 - 828 (2007/10/02)
The catalytic effect of substituted diphenylphosphoric acids on the rate of the reaction of butyryl chloride with 1-butanol in toluene was investigated.It was shown that the effect of the nature of the substituent in the acid molecule has little effect on its catalytic activity.This indicates a bifunctional mechanism of catalysis in the reaction.
