184 research outputs found
<Abstract of published report>Synthesis and Structure of 1-Alkynyl-1,2-benziodoxol-3(1H)-ones.
Get PDF<Abstract of Published Report>Facile Synthesis of Optically Active Tertiary Alcohol Building Blocks by Stereospecific C-H Insertion Reaction of Dichlorocarbene with Secondary Alcohol Derivatives.
Get PDFASYMMETRIC 1,3-DIPOLAR CYCLOADDITION REACTIONS OF AZOMETHINE IMINES WITH ACROLEIN CATALYZED BY L-PROLINE AND ITS DERIVATIVES
Get PDF1,3-Dipolar cycloadditions between acrolein and various N,N'-cyclic azomethine imines in the presence of L-proline and its derivatives as organocatalysts were investigated. Reactions that were catalyzed by (S)-indline-2-carboxylic acid (30 mol%) in CHCl3/MeOH 97:3 (v/v) showed high exo-selectivities (exolendo 91:9 similar to 99:1) and enantioselectivities (75 similar to 98% ee). In contrast, reactions catalyzed by L-proline (30 mol%) under similar conditions favored the endo-cycloadduct (83:27 similar to 99:1) with modest to good enantioselectivities (31 similar to 83% ee). Based on our studies, the diastereoselective mechanism of the L-proline-catalyzed reaction was found to involve the isomerization of the exo- to the endo-cycloadduct in the presence of L-proline.ArticleHETEROCYCLES. 81(7):1669-1688 (2010)journal articl
<Abstract of published report>A highly asymmetric, Lewis Acid-catalysed Diels-Alder reaction using optically active 2-(3-tolyl-p-sulfinyl)furyl α, β-unsaturated ketones as a dienophile.
Get PDF<Abstract of published report>Axial Preference of Bulky Group- and Electron-Withdrawing Group-Substituted Oxygen Atom on the Chair-Type Cyclohexanone, Glutaric Anhydride, and Glutarimide.
Get PDF<Abstract of published report>A Stable Crystalline (Alkylperoxy)iodinane : 1-(tert-Butylperoxy)-1,2-benziodoxol-3(1H)-one.
Get PDF<Abstract of published report>An Interesting Inclusion Phenomeno with (S)-1-(Hydroxydiphenylmethyl)-5-azoniaspiro[4.4]nonane Bromide and (S)-1-(Hydroxydiphenylmethyl)-5-azoniaspiro[4.5]decane Bromide and Optical Resolution of Binaphthyl and Biphenanthryl Diols by Inclusion Crystalliza : -tion with These Optically Active Ammonium Salts.
Get PDF<Abstract of published report>Highly Stereoselective Hetero Diels-Alder Reactions of Chiral 3-(p-Tolylsulfinyl)-2-furaldehyde with Danishefsky\u27s Diene Promoted by a Lanthanoid Lewis Acid.
Get PDFRecommended from our members
Functionalized coatings by electrospinning for anti-oxidant food packaging
Get PDFThe development of advanced formulations used for food packaging applications, which behave as protection or preservation materials and improve consumers’ health offers a route to reduced food wastage. The present study deals with investigations on the possibility of obtaining functionalized coatings by electrospinning of poly(ɛ-caprolactone), a synthetic biodegradable polymer together with vitamin E (α-tocopherol), selected as plant-based phenolic antioxidant. In this approach electrospinning allows the production of high surface area materials and thus offering an increased antioxidant activity. The electrospun fibres of poly(ɛ-caprolactone)/vitamin E were obtained, studied and their antioxidant properties were evaluated by measuring the fibre reactivity with 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical. The potential for extending the shelf-life of food products by using this approach is discussed
<Abstract of published report>Diastereoselective Alkylation of Chiral Tin(II) Enolates onto Cyclic Acyl Iminium Ions. : Asymmetric Total Syuthesis of (-)-Supinidine.
Get PDF- …
