摘要:
The present invention is a process for concentrating aqueous epigallocatechin gallate (EGCG) solutions by feeding an aqueous EGCG solution to at least one membrane module under pressure to provide a permeate purge and a retentate return so that in the latter the concentration of EGCG is increased. The permeate purge and the retentate return are then collected.
摘要:
A process for the manufacture of a 5-cyano-4-lower alkyl-oxazole by the dehydration of a 5-carbamoyl-4-lower alkyl-oxazole is disclosed. The reaction is carried out by dehydrating the oxazole with silicon tetrachloride in the presence of an amine in an aprotic organic solvent. 5-Carbamoyl-4-methyl-oxazole may be dehydrated by the process in accordance with the invention to obtain 5-cyano-4-methyl-oxazole, which is a valuable intermediate in the synthesis of pyridoxine.
摘要:
The present invention relates to new organic compounds, to their synthesis as well as to their use in organic synthesis, especially in processes forming intermediates (building blocks) for the synthesis of vitamin A or β-carotene or other carotenoids.
摘要:
The present invention relates to novel structured catalysts based on sintered metal fibers (SMF) coated by a basic oxide layer with Pd-nanoparticles, to reactions of organic compounds with hydrogen in the presence of said catalyst and an organic base as well as to vitamins, carotinoids, perfume ingredients, and/or food or feed ingredients prepared by using this reaction.
摘要:
A process for the manufacture of gamma-delta-unsaturated ketones of formula (R1)(R2)C═CH—CH2—CH2—CO—R3 (I), wherein R1 is methyl or ethyl; R2 is a saturated or unsaturated linear or cyclic hydrocarbon residue and R3 is methyl or ethyl, by reacting a tertiary vinyl carbinol of formula (R1)(R2)C(OH)—CH═CH2 (II) with an isopropenyl methyl or ethyl ether of formula H3C—C(OR3)═CH2 (III) in the pre-sence of an ammonium salt as catalyst.
摘要:
The invention relates to a process of reacting a primary allylic alcohol with a compound containing a) a metal selected from the group consisting of Ag, Au, Ce, Mn, Ni, Ru, Re, Zn and Co preferably Ag and b) an oxidant like TEMPO (2,2′,6,6′-tetra-methylpiperidin-1-oxyl) or its derivates and c) a co-oxidants selected from the group of peroxodisulfates (PDS), H2SO5, H2O2, NaOCl, O2, KOCl, and air.
摘要翻译:本发明涉及使一级烯丙基醇与含有a)选自Ag,Au,Ce,Mn,Ni,Ru,Re,Zn和Co的金属优选Ag和b)氧化剂 例如TEMPO(2,2',6,6'-四甲基哌啶-1-氧基)或其衍生物,和c)选自过氧二硫酸盐(PDS),H 2 SO 5,H 2 O 2,NaOCl,O 2,KOCl的共氧化剂 ,和空气。
摘要:
The present invention is directed to a catalyst comprising palladium on a porous Silica glass as carrier, as well as to the use of such catalyst for the selective hydrogenation of alkines to alkenes.
摘要:
The present invention relates to an improved process of production of substituted diphenylacetylenes (tolanes) of formula (I) which are starting materials for production of stilbenes products.
摘要:
A process for the preparation of 1-ethynyl-3,3-dimethylcyclohexan-1-ol from dimedone by a reaction sequence of reduction and ethynylation and its further transformation into green ketone.
摘要:
A process for the preparation of 1-(3,5-diacetoxyphenyl)-ethanol by catalytic hydrogenation of 3,5-diacetoxy-acetophenone in the presence of a Ni-alloy as catalyst in a C1-3-carboxylic acid ester as solvent.