Addition of Dinlkylzinc to Ketones in the Presence of Silylating Agents: Synthesis of Functionalized Tertiary Silyl Ethers
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Alvisi, Chiara,Casolari, Sonia,Costa, Anna Luisa,Ritiani, Monica,Tagliavini, Emilio
p. 1330 - 1333
(2007/10/03)
Effect of the Structure of Unsaturated Aliphatic Alcohols on the Hydrogenation Rate over Pd-Ru Membrane Catalyst
It is shown that the rate of hydrogenation of substituted propargyl and allyl alcohols, as measured in the liquid phase on a membrane Pd-Ru alloy catalyst is described by the two-parameter Taft equation, which accounts for the induction and steric substituent effects.A positive induction effect of the substituent group promotes the reaction, whereas a negative one slows it down; an enhancement in the steric factor decreases the rate of conversion.Both induction and steric effects are stronger in reactions with ethylenic rather than acetylenic alcohols and for trans rather than cis isomers.
Karavanov, A. N.,Gryaznov, V. M.,Batyrev, I. G.,Olenina, E. G.
p. 739 - 743
(2007/10/02)
Oxidizing Action of Hydroperoxides. Oxidation of Alkyl Aryl Ketones by Hydroperoxides
The oxidation of alkyl aryl ketones by t-butyl hydroperoxide under basic conditions gave products which resulted from the fission of the carbon-carbon bond between carbonyl carbon and alkyl carbon.The reaction was investigated using chiral alkyl aryl ketones.On the basis of the results, a probable reaction mechanism is proposed.