The present invention is directed to a novel compound, but-2-enoic acid 1,2-dimethyl-butyl ester, and a method of improving, enhancing or modifying a fragrance formulation through the addition of an olfactory acceptable amount of but-2-enoic acid 1,2-dimethyl-butyl ester.
OPTICAL RECORDING MEDIUM AND COMPOUND USED FOR THE SAME
申请人:SHIOZAKI Hiroyoshi
公开号:US20090306376A1
公开(公告)日:2009-12-10
A compound comprising a ring structure including a ring composed of four carbon atoms and two nitrogen atoms and a substituted or unsubstituted amino group bonded to the ring structure.
The Butenes from the Reduction of Isobutyraldehyde by s-Butylmagnesium Bromide
作者:William G. Young、John D. Roberts
DOI:10.1021/ja01222a510
日期:1945.6
diisopropyl ketone by a Grignard reagent involves hydrogen atoms attached to the beta-carbon atom of the Grignard reagent. If the Grignard reagent had no hydrogen atoms on the β-carbon, as with neopentylmagnesium chloride, no reduction was detected. It was pointed out that a correlation exists between the extent of reduction of diisopropyl ketone and the number and primary, secondary or tertiary character of
Whitmore 和 George 已经表明,通过格氏试剂还原二异丙基酮涉及连接到格氏试剂的 β-碳原子上的氢原子。如果格氏试剂在 β-碳上没有氢原子,如新戊基氯化镁,则未检测到还原。有人指出,二异丙基酮的还原程度与格氏试剂的β-氢的数量和一级、二级或三级特征之间存在相关性。然而,很难从使用几种格氏试剂获得的数据确定不同类别 β-氢原子的相对还原率,因为加成和烯醇化的竞争反应也受到结构的显着影响。
[DE] VERFAHREN ZUR HERSTELLUNG VON ASTAXANTHIN AUS ASTACIN<br/>[EN] METHOD FOR PRODUCING ASTAXANTHIN FROM ASTACIN<br/>[FR] PROCÉDÉ DE FABRICATION D'ASTAXANTHINE À PARTIR D'ASTACINE
申请人:BASF SE
公开号:WO2016023732A1
公开(公告)日:2016-02-18
Die Erfindung betrifft ein Verfahren zur stereounselektiven sowie zur stereoselektiven Synthese von Astaxanthin aus Astacin. Hierzu setzt man ein Reduktionsmittel ein, das ausgewählt ist aus der Gruppe Wasserstoffgas, einem sekundären Alkohol, Ameisensäure sowie den Salzen der Ameisensäure oder aus einem Gemisch wenigstens zweier Vertreter der vorab angegebenen Verbindungsklassen. Ein weiterer Gegenstand der Erfindung ist die Verwendung von Astacin als Ausgangsverbindung für die Synthese von Astaxanthin.
PROCESS FOR OBTAINING A DIALKYL CARBONATE AND AN ALKYLENE GLYCOL
申请人:SCHMIDT Andrea
公开号:US20130144080A1
公开(公告)日:2013-06-06
The invention relates to a process for obtaining a dialkyl carbonate and an alkylene glycol from a stream comprising dialkyl carbonate, alkylene carbonate, alkylene glycol and alcohol, comprising the following steps:
(a) distillatively removing a stream (
5
) comprising dialkyl carbonate and alkylene glycol as a heteroazeotrope from the stream comprising dialkyl carbonate, alkylene carbonate, alkylene glycol and alcohol in a first distillation stage (
1
),
(b) separating the stream (
5
) comprising dialkyl carbonate and alkylene glycol as a heteroazeotrope into a first crude product stream (
27
) comprising essentially di-alkyl carbonate and a second crude product stream (
29
) comprising essentially alkylene glycol in an apparatus for phase separation (
25
).