نتایج جستجو برای: phosphite ester

تعداد نتایج: 37751  

Journal: :The Journal of organic chemistry 2009
Andrejs Pelss Esa T T Kumpulainen Ari M P Koskinen

Highly chemoselective conjugate reduction of chiral alpha,beta-unsaturated amino ketones has been developed by using triisopropyl phosphite ligated copper hydride complex. The highlights of the method are wide substrate compatibility and exceptional chemoselectivity.

Journal: :Journal of the American Chemical Society 2011
Bogdana Goryanova Tina L Amyes John A Gerlt John P Richard

Orotidine 5'-monophosphate decarboxylase (OMPDC) catalyzes the exchange for deuterium from solvent D(2)O of the C-6 proton of 1-(β-d-erythrofuranosyl)-5-fluorouracil (FEU), a phosphodianion truncated product analog. The deuterium exchange reaction of FEU is accelerated 1.8 × 10(4)-fold by 1 M phosphite dianion (HPO(3)(2-)). This corresponds to a 5.8 kcal/mol stabilization of the vinyl carbanion...

2015
Qi Zheng Laia Vilà-Nadal Christoph Busche Jennifer S Mathieson De-Liang Long Leroy Cronin

By incorporating phosphorus(III)-based anions into a polyoxometalate cage, a new type of tungsten-based unconventional Dawson-like cluster, [W18O56(HP(III)O3)2(H2O)2](8-), was isolated, in which the reaction of the two phosphite anions [HPO3](2-) within the {W18O56} cage could be followed spectroscopically. As well as full X-ray crystallographic analysis, we studied the reactivity of the cluste...

2013
Farida Hamchaoui Houria Rebbah Eric Le Fur

The crystal structure of the title compound, NH4[In(HPO3)2], is built up from In(III) cations (site symmetry 3m.) adopting an octa-hedral environment and two different phosphite anions (each with site symmetry 3m.) exhibiting a triangular-pyramidal geometry. Each InO6 octa-hedron shares its six apices with hydrogen phosphite groups. Reciprocally, each HPO3 group shares all its O atoms with thre...

Fatemeh Sheikholeslami-Farahani

Phosphonate derivatives were prepared using multicomponent reactions of dialkyl acetylenedicarboxylate with 4-hydroxycumarine in the presence of trimethyl or triphenyl phosphite in good yields.

Journal: :Phytopathologia Mediterranea 2021

Twelve trials, in closed soilless culture under controlled conditions, were carried out to evaluate the efficacy of resistance inducers (based on K-phosphite and K-silicate used alone or combination), experimental biocontrol agents (Trichoderma sp. TW2, a mixture Pseudomonas FC 7B, 8B, 9B, Fusarium solani FUS25, PB26), commercial formulation Trichoderma gamsii + T. asperellum, against diseases ...

2002
BALAJI R JAGIRDAR NISHA MATHEW Balaji R Jagirdar Nisha Mathew

A series of new dicationic dihydrogen complexes of ruthenium of the type cis-[(dppm)2Ru(η-H2)(L)][BF4]2 (dppm = Ph2PCH2PPh2; L = phosphite) have been prepared by protonating the precursor hydride complexes cis[(dppm)2Ru(H)(L)][BF4] using HBF4•Et2O. The precursor hydride complexes have been obtained from trans-[(dppm)2Ru(H)(L)][BF4] (L = phosphite) via a rare acidcatalysed isomerization reaction...

2015
Kezhi Jiang Ningwen Zhang Hu Zhang Jianmei Wang Mingrong Qian

The gas phase pyrolysis of trichlorfon was investigated by the on-line gas chromatography - mass spectrometry (GC-MS) pyrolysis and theoretical calculations. Two reaction channels were proposed in the pyrolytic reaction, by analyzing the detected pyrolytic products in the total ion chromatography, including 2,2,2-trichloroacetaldehyde, dimethyl phosphite, and dichlorvos. Theoretical calculation...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2004
Kechao Yang William W Metcalf

Genetic analysis indicates that Escherichia coli possesses two independent pathways for oxidation of phosphite (Pt) to phosphate. One pathway depends on the 14-gene phn operon, which encodes the enzyme C-P lyase. The other pathway depends on the phoA locus, which encodes bacterial alkaline phosphatase (BAP). Transposon mutagenesis studies strongly suggest that BAP is the only enzyme involved in...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید