Preparation of 3-bromomethyl-3-butenal diethylacetal and its conversion into isoprenoid aldehydes derivatives
摘要:
The cyclopropanation of ethyl 3,3-diethoxypropionate with alkoxytitanacyclopropane reagents followed by the cleavage of the three-membered carbocycle in the formed cyclopropyl mesylate provided in a good yield 3-bromomethyl-3-butenal diethylacetal. The latter was brought into reactions of aldehyde allylation and cross-coupling with allyl halides in the intermediate stages at the generation of carbanionic intermediates. The conversion of compounds obtained into the corresponding beta, gamma- or alpha,beta-unsaturated aldehydes demonstrated the opportunity of applying 3-bromomethyl-3-butenal diethylacetal as a C-5-isoprenoid building block.
Comparison of the Key Aroma Compounds in Fresh, Raw Ginger (<i>Zingiber officinale</i> Roscoe) from China and Roasted Ginger by Application of Aroma Extract Dilution Analysis
作者:Tanja Schaller、Peter Schieberle
DOI:10.1021/acs.jafc.0c06731
日期:2020.12.23
By application of a comparative aroma extract dilution analysis on the volatile fractions isolated by solvent extraction and solvent-assisted flavor evaporation (SAFE) from fresh raw Chinese ginger (Zingiber officinaleRoscoe) and roasted ginger, 21 or 33 odorants, respectively, with flavor dilution (FD) factors in the range of 32–4096 were identified. In raw ginger, the highest FD factors were found
METHOD FOR PRODUCING OPTICALLY ACTIVE, RACEMIC MENTHOL
申请人:Heydrich Gunnar
公开号:US20100249467A1
公开(公告)日:2010-09-30
The present invention relates to a particularly economic overall method for producing menthol, specifically for producing optically active, essentially enantiomerically and diastereomerically pure L-menthol and racemic menthol, starting from the starting material citral which is available inexpensively on an industrial scale. The method comprises the following steps
a.1) catalytic hydrogenation of neral and/or geranial to give citronellal,
b.1) cyclization of citronellal to isopulegol in the presence of an acidic catalyst,
c.1) purification of isopulegol by crystallization and
d.1) catalytic hydrogenation of isopulegol to give menthol.
Kontinuierliches Verfahren zur Herstellung von Neral in reiner oder angereicherter Form
申请人:BASF SE
公开号:EP2008989A1
公开(公告)日:2008-12-31
Die vorliegende Erfindung betrifft ein kontinuierliches Verfahren zur Herstellung von Neral (cis-Citral) in reiner oder angereicherter Form durch destillative Abtrennung von Neral aus Stoffgemischen die im wesentlichen Neral und Geranial (trans-Citral) enthalten. Dabei wird die destillative Abtrennung in einer Trennwandkolonne oder in einer Zusammenschaltung von zwei Destillationskolonnen in Form einer thermischen Kopplung vorgenommen.
A FRAGRANCE-DELIVERY COMPOSITION COMPRISING PERSULFATE ION-CROSSLINKED POLYVINYL ALCOHOL MICROCAPSULES AND METHOD OF USE THEREOF
申请人:APPVION, INC.
公开号:EP2907568A1
公开(公告)日:2015-08-19
An aqueous composition is provided having a pH of from about 2.0 to about 5.7 to about 12.8 and comprising boron or persulfate ion-crosslinked polyvinyl alcohol microcapsules. A method of delivering a fragrance to a substrate is further provided comprising applying to the substrate an aqueous composition comprised of fragrance-containing, boron or persulfate ion-crosslinked, polyvinyl alcohol microcapsules, as well as a method of cleaning a substrate comprising applying to the substrate an aqueous composition comprised of fragrance-containing, boron or persulfate ion-crosslinked, polyvinyl alcohol microcapsules together with at least one cleaning component.