、 草酸醛 、 乙二醛-1,1-二甲基乙缩醛溶液 、 对甲苯磺酸 在
1,1,2,2-四甲氧基乙烷 作用下,
以
甲醇 、 水 为溶剂,
以162 g (1.08 mol, 90% based on glyoxal and 2,2-dimethoxyacetaldehyde) of 1,1,2,2-tetramethoxyethane were isolated的产率得到1,1,2,2-四甲氧基乙烷
参考文献:
名称:
Process for continuously preparing acetals of alpha, beta-dicarbonyl compounds
Electoral Competition Under the Threat of Political Unrest
作者:M. Ellman、L. Wantchekon
DOI:10.1162/003355300554836
日期:2000.5.1
We study elections in which one party (the strong party) controls a source of political unrest; e.g., this party could instigate riots if it lost the election. We show that the strong party is more likely to win the election when there is less information about its ability to cause unrest. This is because when the weak party is better informed, it can more reliably prevent political unrest by implementing a “centrist” policy. When there is uncertainty over the credibility of the threat, “posturing” by the strong party leads to platform divergence.
A process is described for preparing diacetals of glyoxal by reacting from 40 to 75% by weight aqueous glyoxal with monohydric alcohols in the presence of an acid catalyst, which comprises leaving a liquid mixture which, at the beginning of the reaction, comprises alcohol and glyoxal in a molar ratio of at least 15:1 and also water in a concentration of not more than 8% by weight in contact with the acid catalyst until concentration in the reaction mixture of the diacetal formed reaches at least 70% of the equilibrium concentration without more than 5% by weight of the alcohol used having already been distilled off.
Process for the separation, by countercurrentwise liquid-liquid extraction, of a glyoxal diacetal from a crude mixture comprising it
申请人:Simon Olivier
公开号:US20070073088A1
公开(公告)日:2007-03-29
The invention relates to a method for separating a diacetal of the glyoxal of a raw mixture comprising said diacetal of the glyoxal and a monoacetal of the glyoxal, by means of counter-current liquid-liquid extraction.
这项发明涉及一种通过逆流液液萃取的方法,用于分离一种原混合物中的丙二醛二缩醛和丙二醛单缩醛。
N,N'-dialkyl derivatives of polyhydroxyalkyl alkylenediamines
申请人:Ford Edward Michael
公开号:US20060013780A1
公开(公告)日:2006-01-19
Surfactant compositions containing compounds according to structure (I), and methods of making them, are disclosed. The compounds provide reduced dynamic and equilibrium surface tension, good solubility, moderate foaming, and good cleaning performance. The methods for making them involve reaction of N-(polyhydroxyalkyl)-alkylamines with dinitriles, dialdehydes, or acetals or hemiacetals of dialdehydes in the presence of hydrogen and a transition metal catalyst.
In structure (I), x is an integer from about 1 to 12, R
1
and R
2
are independently C3-C30 linear alkyl, cyclic alkyl, branched alkyl, alkenyl, aryl, alkylaryl, alkoxyalkyl, and dialkylaminoalkyl; and R
3
and R
4
are independently hydrogen or a pyranosyl group such as α-D-glucopyranosyl, β-D-glucopyranosyl, or β-D-galactopyranosyl.
[EN] PROCESS FOR THE PREPARATION OF QUATERNIZED PYRIDAZINE DERIVATIVES<br/>[FR] PROCÉDÉ DE PRÉPARATION DE DÉRIVÉS DE PYRIDAZINE QUATERNISÉS
申请人:SYNGENTA CROP PROTECTION AG
公开号:WO2022034204A1
公开(公告)日:2022-02-17
The present invention provides, inter alia, a process for producing a compound of formula (I) wherein the substituents are as defined in claim 1. The present invention further provides intermediate compounds utilised in said process, and methods for producing said intermediate compounds.