Reactivity of the double bond in coumarins and related α−β unsaturated carbonyl compounds

1936 ◽  
Vol 4 (6) ◽  
pp. 630-638 ◽  
Author(s):  
P. Suryaprakasa Rao ◽  
T. R. Seshadri
Keyword(s):  
Double Bond ◽  
Carbonyl Compounds

Copper-Catalyzed Oxidative Self-Coupling of α-Amino Carbonyl Compounds for the Synthesis of Tetrasubstituted 1,4-Enediones

Synlett ◽  
2018 ◽  
Vol 29 (18) ◽  
pp. 2422-2426
Author(s):  
Bing Yi ◽  
Jiannan Xiang ◽  
Niannian Yi ◽  
Yi Xiong ◽  
Qingjun Huang ◽  
...  
Keyword(s):  
Double Bond ◽  
Carbonyl Compound ◽  
Carbonyl Compounds ◽  
Simultaneous Formation ◽  
High Stereoselectivity

A protocol for the copper-catalyzed oxidative self-coupling of α-amino carbonyl compounds has been developed for the synthesis of tetrasubstituted 1,4-enediones (Z-isomers) in moderate to good yields through the cleavage of four sp3C–H bonds and the simultaneous formation of one C=C double bond in the α-amino carbonyl compound. The strategy has the advantages of using readily available starting ­materials and of high stereoselectivity.

Reduction of conjugate double bonds with trichlorosilane

2000 ◽  
Vol 78 (11) ◽  
pp. 1396-1398 ◽  
Author(s):  
Moni Chauhan ◽  
Philip Boudjouk
Keyword(s):  
Double Bond ◽  
Carbonyl Compounds ◽  
Double Bonds ◽  
Cyclic Ketones ◽  
Unsaturated Esters ◽  
Mild Conditions ◽  
Carbon Double Bond

A variety of α,β-unsaturated esters and cyclic ketones underwent smooth reduction of the carbon–carbon double bond with a combination of inexpensive and readily available trichlorosilane and CoCl2. The reactions are performed under very mild conditions and products are obtained in high yields.Key words: reduction, carbonyl compounds, trichlorosilane, ketones, chemoselectivity.

Highly selective hydrogenation of CC double bond in unsaturated carbonyl compounds over NiC catalyst

2012 ◽  
Vol 188 ◽  
pp. 155-159 ◽  
Author(s):  
Nagendranath Mahata ◽  
Adelino F. Cunha ◽  
José J.M. Órfão ◽  
José L. Figueiredo
Keyword(s):  
Double Bond ◽  
Selective Hydrogenation ◽  
Carbonyl Compounds

Electrocatalytic hydrogenation of conjugated enones on nickel boride, nickel, and Raney nickel electrodes

1995 ◽  
Vol 73 (6) ◽  
pp. 846-852 ◽  
Author(s):  
Behzad Mahdavi ◽  
Philippe Chambrion ◽  
Julie Binette ◽  
Eric Martel ◽  
Jean Lessard
Keyword(s):  
Double Bond ◽  
Raney Nickel ◽  
Carbonyl Compounds ◽  
Constant Current ◽  
Electrocatalytic Hydrogenation ◽  
Aqueous Methanol ◽  
Nickel Boride ◽  
Unsaturated Ketones ◽  
Nickel Electrodes ◽  
Bond Hydrogenation

The selectivity of the electrocatalytic hydrogenation (ECH) of conjugated enones to the corresponding carbonyl compounds has been investigated in aqueous methanol under constant current at nickel boride, fractal nickel, and Raney nickel electrodes made of pressed powders. The influence of various parameters (water percentage, pH, concentration of substrate, and current density) on the selectivity of the carbon–carbon double bond hydrogenation was studied with cyclohex-2-en-1-one at nickel boride electrodes. Under given electrolysis conditions, fractal nickel electrodes were found to give the highest selectivity. The selectivity of the ECH of a variety of conjugated enones at fractal nickel electrodes was determined under electrolysis conditions that gave the best selectivity with cyclohexenone at nickel boride electrodes. Keywords: electrocatalytic hydrogenation, α,β-unsaturated ketones, selective hydrogenation, nickel based cathodes.

scholarly journals t-BuCl–Nal as a Reagent for the Selective Reduction of Olefinic Double Bond of β-Phenyl α,β-Unsaturated Carbonyl Compounds

1987 ◽  
Vol 60 (9) ◽  
pp. 3421-3422 ◽  
Author(s):  
Takashi Sakai ◽  
Kazuyoshi Miyata ◽  
Kazuomi Hondo ◽  
Masanori Utaka ◽  
Akira Takeda
Keyword(s):  
Double Bond ◽  
Carbonyl Compounds ◽  
Selective Reduction ◽  
Olefinic Double Bond
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