The oxidation of primary and secondary, saturated, allylic or benzylic, alcohols is carried out in 1,2-dichloroethane at reflux using catalytic amounts of both PdCl2 and Adogen 464 in the presence of an excess of sodium carbonate. High selectivities are obtained from saturated and benzylic, secondary alcohols. Primary alcohols afford mixtures of aldehydes and esters. The migration of the double bond
High selectivity to the corresponding ketones and aldehydes has been observed for the title reaction when performed in 1,2-dichloroethane at 80°C in the presence of catalytic amounts of pyridnium dichromate and Adogen 464. The oxidation of unactivated alcohols was less efficient under these conditions.
First synthesis of a new acetogenin of annonaceae, reticulatamol : Activated tin hydride with enhanced reducing ability
作者:Vu Thi Tam、Christophe Chaboche、Bruno Figadère、Bertrand Chappe、Bui Chi Hieu、André Cavé
DOI:10.1016/s0040-4039(00)75989-2
日期:1994.1
A new annonaceous acetogenin, reticulatamol 1, is described. In order to confirm its structure, its total synthesis has been performed, using as a key step a radical coupling reaction between an alkyl iodide and an enone, followed by an original reduction of the so obtained ketone to yield the desired natural product.
Homogeneous chromium(VI)-catalyzed oxidations of allylic alcohols by alkyl hydroperoxides: Influence of the nature of the alkyl group on the product distribution
The chromium oxide-catalyzed oxidation of allylic alcohol - R1CH(OH)CR2CHR3 - by ROOH (R= t-Bu, PhCMe2) affords generally a mixture of R1COCR2CHR3 and R1CHCR2COR3. The rate of the reaction and the ratio between the two oxidized compounds both depend on the nature of R. It has been concluded that the oxidative species and the reactive intermediates contain this R group.