We developed a biocatalytic system for directly epoxidation of limonene to limonene dioxide.A relatively high yield of 93% for limonene dioxide achieved.Cell wall and membrane lipases inRhizopus oryzaedrive slow percid production.Optimal conditions include a high H2O2concentration and trisodium citrate ...
ChemInform Abstract: REGIO- AND STEREO-SELECTIVITIES IN THE EPOXIDATIONS OF LIMONENE, ENDO-DICYCLOPENTADIENE, AND EXO-DICYCLOPENTADIENEdoi:10.1002/chin.197430157oxidation, dehydrogenation, ozonolysisbridged compoundshydrocarbons (benzene compounds)TADASHI SATO...
95Mo NMR monitoring experiments of complex II in the presence of (R)-limonene, together with conductivity measurements, showed the formation of an ionic metallic species (1:1 electrolyte). These results point to a bimetallic species where one of the metal atoms is coordinated to the olefin by...
Recently, a W/SiO2 catalyst prepared by grafting of tungsten species on silica by dry impregnation was reported to show good catalytic performance, no leaching but moderate reusability in the epoxidation of limonene and methyl oleate in the presence of H2O2 [32]. An alternative approach involves ...
In the compounds I-C, R3is preferably methyl. R9is preferably an X group, and in particular halogen, especially when R10is methyl. Examples of compounds of the general formula I-C are 1,8-dichloro-4-p-menthane (limonene dihydrochloride), 1,8-dibromo-4-p-menthane (limonene dihydrobromide)...
Catalyst synthesis and use in the epoxidation of R-(+)-limonene and (-)-alpha-pinene using molecular oxygen.Catalysis Letters. 2004Bhattacharjee S, Anderson JA (2004) Catal Lett 95:119Epoxidation by Layered Double Hydroxide-Hosted Catalysts. Catalyst Synthesis and Use in the Epoxidation of R-(...
Since R-(+)-limonene is a pure enantiomerically compound, the asymmetric epoxidation of this substrate offers the possibility of using, an achiral catalyst which is less expensive than its chiral counterpart. In this work, we report on the effect of the oxidizing agent and catalyst chirality on...
Selective epoxidation of the (R) and (S) isomers of limonene by dioxomolybdenum(VI) complexes anchored covalently on TiO2 nanotubes using UV鈥揤is light and O2 as the oxidizing agent was evaluated. It is interesting to study the effect of the ligands: bipyridine, terpyridine, and Schiff base...
This invention relates to a process for the epoxidation of a tetrasubstituted alkene such as terpinolene to the corresponding epoxide such as terpinolene epoxide by reacting the tet
Peroxidic complexes of vanadium, niobium or tantalum, wherein the metal is linked to an oxygen molecule carrying two negative charges, are used either as reactants for the oxidation of olefinic substr