نتایج جستجو برای: α,β-Unsaturated carbonyl compounds

تعداد نتایج: 252812  

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 1996
bahman tamami moredin goudarzian

the difficult to handle and store zinc borohydride, zn(bh4)2, is stabilized by supporting it on polyvinylpyridine. this new mild, efficient, selective, and regenerable polymer supported borohydride reducing agent reduces a variety organic compounds such as, aldehydes, a-b-unsaturated carbonyl compounds, acid chlorides, epoxides, disulfides, as well as reductive acetylation of carbonyl compounds...

2008
Yoichiro Kuninobu Yuta Nishina Atsushi Kawata Makoto Shouho Kazuhiko Takai

Rhenium complex, [ReBr(CO)3(thf)]2-catalyzed reactions between aromatic imines and either acetylenes or α,β-unsaturated carbonyl compounds gave indene derivatives in good to excellent yields. These reactions proceed via C–H bond activation, insertion of acetylenes or α,β-unsaturated carbonyl compounds, intramolecular nucleophilic cyclization, and reductive elimination. Indene derivatives were a...

Bahman Tamami Moredin Goudarzian

The difficult to handle and store zinc borohydride, Zn(BH4)2, is stabilized by supporting it on polyvinylpyridine. This new mild, efficient, selective, and regenerable polymer supported borohydride reducing agent reduces a variety organic compounds such as, aldehydes, a-b-unsaturated carbonyl compounds, acid chlorides, epoxides, disu...

Journal: :Journal of Synthetic Organic Chemistry, Japan 1966

Journal: :Angewandte Chemie 2013
Junming Mo Liang Shen Yonggui Robin Chi

Saturated carbonyl compounds, such as aldehydes and esters, are basic building blocks for the synthesis of organic molecules and materials. Reactions with carbonyl compounds as substrates primarily occur at the carbonyl carbon atom (as an electrophilic center) or the a-carbon atom (as a prenucleophile). In organocatalysis, several powerful approaches have been developed for the asymmetric funct...

2012
Piotr Bałczewski Marian Mikołajczyk

Since the discovery by Knoevenagel [1] that doubly activated carbonic acids (CH-acids) react with carbonyl compounds to give the corresponding conjugated olefins, this reaction has been widely used in organic synthesis as an important method for carbon —carbon bond formation [2, 3). The conden­ sation of 1,3-dicarbonyl compounds with monocar­ bonyl compounds usually leads to a,/3-unsaturated pr...

2006

ome of the most useful reactions of carbonyl compounds involve carbonhydrogen bonds adjacent to the carbonyl group. Such reactions, which can be regarded as the backbone of much synthetic organic chemistry, usually result in the replacement of the hydrogen by some other atom or group, as in the I I I I sequence H-C-C=O -+ X-C-C=O. The important examples we I I will consider in this chapter are ...

Journal: :Organic & biomolecular chemistry 2013
Kun Wen Jinbo Chen Feng Gao Pinaki S Bhadury Erkang Fan Zhihua Sun

An easy to operate method of catalytic hydroboration of unsaturated compounds has been developed with wide substrate scope. Reactions of various aldimines, ketimines, α,β-unsaturated carbonyl compounds, and alkynes were successfully executed with bis(pinacolato)diboron and N-heterocyclic carbenes in methanol without requiring a transition metal or inert atmosphere.

Journal: :Organic & biomolecular chemistry 2013
Sabine Amslinger Nafisah Al-Rifai Katrin Winter Kilian Wörmann Rebekka Scholz Paul Baumeister Martin Wild

The electrophilic nature of chalcones (1,3-diphenylprop-2-en-1-ones) and many other α,β-unsaturated carbonyl compounds is crucial for their biological activity, which is often based on thiol-mediated regulation processes. To better predict their biological activity a simple screening assay for the assessment of the second-order rate constants (k(2)) in thia-Michael additions was developed. Henc...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید