[EN] NEMATICIDAL N-(2-SUBSTITUTED 2-PHENYLETHYL)CARBOXAMIDES AND N-(2-SUBSTITUTED 2-PHENYLETHYL)-THIOCARBOXAMIDES [FR] N-(2-PHÉNYLÉTHYLE SUBSTITUÉ EN POSITION 2)-CARBOXAMIDES ET N-(2-PHÉNYLÉTHYLE SUBSTITUÉ EN POSITION 2)-THIOCARBOXAMIDES NÉMATICIDES
[EN] NEMATICIDAL N-(2-SUBSTITUTED 2-PHENYLETHYL)CARBOXAMIDES AND N-(2-SUBSTITUTED 2-PHENYLETHYL)-THIOCARBOXAMIDES [FR] N-(2-PHÉNYLÉTHYLE SUBSTITUÉ EN POSITION 2)-CARBOXAMIDES ET N-(2-PHÉNYLÉTHYLE SUBSTITUÉ EN POSITION 2)-THIOCARBOXAMIDES NÉMATICIDES
A simple and an efficient one-pot procedure has been developed to synthesize various aryl carboxylic esters directly from aryl aldehydes using hydrogen peroxide without any catalyst. The reaction proceeds smoothly at room temperature. A preliminary investigation suggests the formation of dialkyl acetal as an intermediate during the reaction sequence.
Cobalt(II) schiff base functionalized mesoporous silica as an efficient and recyclable chemoselective acetalization catalyst
作者:F. Rajabi
DOI:10.1007/bf03246059
日期:2010.9
Cobalt(II) Schiff base functionalized mesoporous silica was synthesized from covalent attachment via the introduction of Co(OAc)(2) to salicylaldimine functionalized mesoporous silica. The catalyst proved to be chemoselective one for the acetalization of aldehydes to the corresponding acetals in alcohol. The immobilized catalyst can be easily recovered and reused for at least ten reaction cycles without significant loss of its catalytic activity.
Baudin, Jean-Bernard; Commenil, Marie-Gabrielle; Julia, Sylvestre A., Bulletin de la Societe Chimique de France, 1996, vol. 133, # 11, p. 1127 - 1141
The bifunctional organocatalyst C3 N,N'-dioxide has been successfully applied to the asymmetric cascade Michael/hemiacetalization reaction of alpha-substituted cyano ketones and beta,gamma-unsaturated alpha-ketoesters for the synthesis of multifunctionalized chiral dihydropyrans. The corresponding products were obtained in excellent yields (up to 99%) with high to excellent enantioselectivities (up to 99% ee).