Results 51 to 60 of about 1,098 (175)

Base- and sulfur-promoted oxidative lactonization of chalcone-acetate Michael adducts: access to pyran-2-ones

A cost-effective, practical, straightforward and scalable synthesis of α-pyrones via base- and sulfur-promoted annulation of phenylacetates and chalcones is reported.
Nguyen, T.B., Retailleau, P., Nguyen, D.T., Tran, H.A., Mac, D.H., Nguyen, C.N., Nguyen, T.T.T.   +6 more
core   +1 more source

(R)-Trifluoro- and Difluoropyruvaldehyde N,S-Ketals:  Chiral Synthetic Equivalents of β-Trifluoro and β-Difluoro α-Amino Aldehydes^†

, 2016
A new, efficient, and stereoselective two-step approach to stereochemically defined chiral nonracemic γ-tri- and γ-difluoro β-amino alcohols (70% to >95% ee) is described, using tri- and difluoropyruvaldehyde N,S-ketals (R)-1a,b as starting materials ...
Alessandro Volonterio (172619), Matteo Zanda (202576), Barbara Vergani (3044868), Marcello Crucianelli (1300422), Pierfrancesco Bravo (3026139)   +4 more
core   +2 more sources

2-Diazo-1-(4-hydroxyphenyl)ethanone: A Versatile Photochemical and Synthetic Reagent [PDF]

, 2014
α-Diazo arylketones are well-known substrates for Wolff rearrangement to phenylacetic acids through a ketene intermediate by either thermal or photochemical activation.
Senadheera, Sanjeewa N., Evans, Anthony S., Givens, Richard S., Toscano, John P.   +3 more
core   +1 more source

Stereochemical assignment at C-24 and C-25 of marine 24-ethyl-26-hydroxy steroids through comparison with synthetic (24S,25S)-, (24S,25R)-, (24R,25R)-, and (24R,25S)-models

, 1990
The four diastereoisomers of cyclostigmastanol I and their E-22-unsatd. derivs. were prepd. Anal. of 1H and 13C NMR spectra of the synthetic model compds. and of their α-methoxy-α-(trifluoromethyl)phenylacetates provided data suitable for the assignment
Luigi Gomez Paloma, RICCIO, Raffaele, Maria Valeria D'Auria, L. Minale, D'AURIA, MARIA VALERIA, L. Gomez Paloma, Luigi Minale, R. Riccio   +7 more
core  

Synthesis of 24-methyl-26-hydroxysteroid sidechains: models for stereochemical assignments in polyhydroxylated marine steroids

, 1990
The four diastereoisomers of cycloergostanol I and their E-22-unsatd. derivs. were prepd. via a Claisen rearrangement as model compds. of established abs. configuration for stereochem. assignments at C-24 and C-25 of marine 24-methyl-26-hydroxysteroids.
F. De Riccardis, RICCIO, Raffaele, M. V. D'AURIA, L. MINALE, D'AURIA, MARIA VALERIA, DE RICCARDIS, Francesco, R. Riccio   +6 more
core  

13C NMR studies of carboxylate inhibitor binding to cobalt(II) carboxypeptidase A

, 1988
Both 13C NMR and electronic absorption spectral studies on cobalt(II) carboxypeptidase A in the presence of acetate and phenylacetate provide evidence for two binding sites for each of these agents.
I. Bertini, SOLA, Marco, D. S. Auld, Gian Carlo Pellacani, PELLACANI, Gian Carlo, Roberto Monnanni, David S. Auld, Ivano Bertini, Bert L. Vallee, R. Monnanni, B. L. Vallee, Marco Sola   +11 more
core   +1 more source

Gas chromatographic enantiomer separation of mandelates and its analogs on permethylated cyclodextrin chiral stationary phases

, 2000
Gas chromatographic enantionmer separation of mandelates and its analogs was investigated on permethylated beta -cyclodextrin (PMBCD) and permethylated gamma -cyclodextrin (PMGCD) chiral stationary phases(CSPs). The compounds investigated included methyl
Zhu, DQ, Zhou, LM, Wang, QH, Nie, MY
core  

Tandem Insertion/Rearrangements by Insertion of Rhodium Carbenes into Sulfur Bonds and Metal-Catalyzed Insertion into α–Diazocarbonyl Compounds [PDF]

This dissertation will focus on four main areas: The first aspect to be discussed will be reaction of allyl 2-diazo-2-phenylacetates with trimethylsilyl thioethers in the presence of rhodium(II) catalysts.
Combs, Jason R.
core   +1 more source

An Historical Review of Phenylacetic Acid

Plant and Cell Physiology, 2019
Plant hormone biology is an ever-evolving field and as such, novel avenues of research must always be sought. Technological and theoretical advancement can also allow for previously dismissed research to yield equally interesting insights into processes now that they are better understood.
openaire   +2 more sources

Conformational analysis of some: α-ethylthio-, α- ethylsulfinyl-, α-ethylsulfonyl-, p-substituted phenylacetates; 1-(5-substituted thiophen-2-yl)-2-(ethylthio)ethanone and 1-(5-substituted furan-2-yl)-2- (ethylthio)ethanone; 1-(5-substituted thiophen-2-yl)-2-(bromo)ethanone

, 2014
A presente tese trata da síntese e análise conformacional dos: α-etiltioacetatos de fenila p-substituídos (Série I), α-etilsulfinilacetatos de fenila p-substituídos (Série II), α- etilsulfonilacetatos de fenila p-substituídos (Série III ...
Daniel Nopper Silva Rodrigues, Rodrigues, Daniel Nopper Silva   +1 more
core   +1 more source