ChemInform Abstract: Photochemical Behavior of α-Diketones on a Silica Gel Surface: A Novel Photoreaction by Intramolecular Trapping of an Excited Ketone Carbonyl Oxygen by an Aryl Group.

ChemInform ◽  
2010 ◽  
Vol 28 (39) ◽  
pp. no-no
Author(s):  
T. HASEGAWA ◽  
M. IMADA ◽  
Y. IMASE ◽  
Y. YAMAZAKI ◽  
M. YOSHIOKA
Keyword(s):  
Silica Gel ◽  
Carbonyl Oxygen ◽  
Aryl Group ◽  
Photochemical Behavior ◽  
Ketone Carbonyl

THE CONDENSATION OF CERTAIN γ-KETONIC ESTERS WITH AROMATIC ALDEHYDES

1932 ◽  
Vol 6 (6) ◽  
pp. 605-613 ◽  
Author(s):  
C. F. H. Allen ◽  
G. F. Frame
Keyword(s):  
Carbonyl Group ◽  
Aromatic Aldehydes ◽  
Sodium Methylate ◽  
Ring Closure ◽  
Aryl Group ◽  
Appropriate Treatment ◽  
Ketone Carbonyl ◽  
Branched Chain ◽  
Cyclic Compounds ◽  
Chloride Methyl

The condensation of methyl and ethyl α-phenyl-β-(para-substituted)benzoyl propionates with benzaldehyde and piperonal in the presence of sodium methylate, followed by acidification, has been found to produce cyclic compounds; the latter are shown to be lactols, six of which are described. The spontaneous ring closure is probably due to the highly branched chain. A mechanism for the reaction is proposed.On oxidation with chromic acid, α-diketones are formed; the latter contain the aryl group introduced as aldehyde. The lactols resemble triphenylcarbinol in several respects, forming a chloride, methyl ether, and acetate on appropriate treatment, all of which, on hydrolysis, regenerate the lactol. They also give colored solutions with concentrated sulphuric acid, from which the starting material is recovered on addition to water. From this work it is evident that in arylated γ-ketonic esters the hydrogen atom alpha to the ketone carbonyl group is more active in alkaline aldol condensations than the hydrogen in the alpha position to the carbalkoxy carbonyl group; the observation of others, that the conjugated system [Formula: see text] is more stable than [Formula: see text], has been confirmed.

Segmental motion of alkyl chains grafted on silica gel, studied by neutron scattering

1983 ◽  
Vol 44 (4) ◽  
pp. 497-503 ◽  
Author(s):  
J.P. Beaufils ◽  
M. C. Hennion ◽  
R. Rosset
Keyword(s):  
Neutron Scattering ◽  
Silica Gel ◽  
Segmental Motion ◽  
Alkyl Chains

Preparation and Characterization of Biodiesel from Karanja Oil by Using Silica Gel Reactor

2014 ◽  
Author(s):  
Sukanta Mondal ◽  
Kaniz Ferdous ◽  
M. Rakib Uddin ◽  
Maksudur R. Khan ◽  
M. A. Islam ◽  
...  
Keyword(s):  
Silica Gel ◽  
Karanja Oil

Detection of a covalent-ionic carbinolamine intermediate in aqueous media by SDTLC on silica gel plates

2007 ◽  
Vol 20 (3) ◽  
pp. 227-230 ◽  
Author(s):  
Ana Reverdito ◽  
Mariano García ◽  
Alejandra Salerno ◽  
Oscar Locani ◽  
Isabel Perillo
Keyword(s):  
Silica Gel ◽  
Aqueous Media

The Photochemical Behavior of Colchicone and Thiocolchicone

2000 ◽  
Vol 71 (1) ◽  
pp. 29 ◽  
Author(s):  
Laura Bussotti ◽  
Maurizio D'Auria ◽  
Paolo Foggi ◽  
Giordano Lesma ◽  
Roberto Righini ◽  
...  
Keyword(s):  
Photochemical Behavior

Synthesis Process and Structure of Al/Mg Modified Silica-gel Particle.

2000 ◽  
Vol 116 (1) ◽  
pp. 56-61
Author(s):  
Tatsuo YAMAGUCHI ◽  
Toshiaki NAKAI ◽  
Kunihiko TAKEDA
Keyword(s):  
Silica Gel ◽  
Synthesis Process ◽  
Modified Silica ◽  
Modified Silica Gel
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