cas 2916-28-1, 2-ethyl-2,4-dimethyl-1,3-dioxolane

Articles about 2916-28-1Total 9 be found

Method for improving activity of propylene epoxide catalyst and co-producing ketal (acetal)
The invention provides a method for synthesizing propylene epoxide and co-producing ketal (acetal) by taking a by-product PG as a raw material in propylene epoxidation in the presence of heteropoly acid as a catalyst. Negative effects of alcohol substances to the activity of the catalyst in epoxidation reaction are eliminated, the activity of the catalyst is improved, the catalyst is used stably,meanwhile, downstream application of the by-product PG is expanded, and a preparation method for ketal (acetal) is provided. The method has the advantages of gentle reaction conditions, good catalyzing stability, good catalyst using effect, and resource utilization of the by-product.
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Paragraph 0020; 0037; 0038; 0039

(2019/01/17)

Phosphorus promoted SO42-/TiO2 solid acid catalyst for acetalization reaction
A novel phosphorus modifed SO42-/TiO2 catalyst was synthesized by a facile coprecipitation method, followed by calcination. The catalytic performance of this novel solid acid was evaluated by acetalization. The results showed that the phosphorus was very effcient to enhance the catalytic activity of SO42-/TiO2. The solid acid owned high activity for the acetalization with the yields over 90%. Moreover, the solid acid could be reused for six times without loss of initial catalytic activities.
Zhong, Shaofeng,Ou, Qiongrong,Shao, Linjun
p. 3005 - 3008
(2015/11/27)

Synthesis of novel solid acidic ionic liquid polymer and its catalytic activities
The novel solid acidic ionic liquid polymer has been synthesized through the copolymerization of acidic ionic liquid oligomers and resorcinol- formaldehyde (RF resin). The catalytic activities were investigated through the acetalization. The results showed that the PIL was very efficient for the reactions with the average yield over 99.0%. The procedure was quite simple with just one-step to complete both the reactions. The high hydrophobic BET surface, high catalytic activities and high stability gave the PIL great potential for green chemical processes. Pleiades Publishing, Ltd., 2013.
Liang, Xuezheng
p. 724 - 729
(2014/01/23)

Synthesis of a novel multi-SO3H functionalized ionic liquid and its catalytic activities
A novel multi-SO3H functionalized ionic liquid is synthesized and a detailed account of its cata- lytic activities in acetalization and acetylation is given. The results showed that the ionic liquid is very efficient in the conventional acid-catalyzed reactions with good to excellent yields within a short reaction time. Oper- ational simplicity, small amounts required, low cost of the catalyst, high yields, scalability and reusability are the key features of this methodology, which indicates the high potentialities of the novel ionic liquid to be used in environmentally friendly processes. Pleiades Publishing, Ltd., 2012.
Xudong, Sun,Huiquan, Xiao,Yijun, Du,Jingjing, Zhang,Xuezheng, Liang,Chenze, Qi
p. 301 - 305
(2012/10/29)

Synthesis of a novel ionic liquid with both Lewis and Br?nsted acid sites and its catalytic activities
The novel ionic liquid with both Lewis and Br?nsted acid sites has been synthesized and its catalytic activities for acetalization and Michael addition were investigated carefully. The novel ionic liquid was stable to water and could be used in aqueous solution. Furthermore, the molar ratio of the Lewis and Br?nsted acid sites could be adjusted according to different reactions. The results showed that the novel ionic liquid was very efficient for the traditional acid-catalyzed reactions with good to excellent yields in short time.
Liang, Xuezheng,Qi, Chenze
experimental part
p. 808 - 812
(2012/01/04)

Synthese d'acetals cycliques dans des conditions douces; Applications a l'acetalisation du chloramphenicol
Acetalization of 1-2 and 1-3 diols, even as sterically crowded as chloramphenicol, by carbonyl derivatives with substituents of various sizes has been performed at room temperature under mild conditions, by using heterogeneous catalysis (sulfonated polystyrene) in the presence of molecular sieves.Several new acetals of chloramphenicol have thus been obtained in good yields, isolated and characterized.
Meslard, J. C.,Subira, F.,Vairon, J. P.,Guy, A.,Garreau, R.
p. 84 - 89
(2007/10/02)

Heterobicycles sulfures derives de l'α-thioglycerol. Synthese d'alkyl-2,8-dioxa-6-thiabicyclooctanes
The synthesis of 2,8-dioxa-6-thiabicyclooctanes, substituted by alkyl or phenyl groups in positions 1, 4, or 7, is described.Four synthetic routes are compared: (i) action of sodium sulfide on 2,4-dichloro-1,3-dialkyldioxolanes; (ii) action of sodium sulfide on the ditosylates of 2,4-dihydroxyalkyl-1,3-dioxolanes; (iii) action of α-haloketones on α-thioglycerol; and (iv) action of α-hydroxyketones on α-thioglycerol.The structures of the dioxathiabicyclooctanes have been established by proton nmr (mass spectra have already been described) and chemically confirmed by desulfurization by Raney Nickel.
Gelas, Jacques,Teppaz-Misson, Marc
p. 1487 - 1493
(2007/10/02)

Enantiomeric Interactions and Reaction Rates: Ketalization of (S)- and (RS)-1,2-Propanediols
Aliphatic ketones, e.g., butanone, are converted nearly quantitatively to the corresponding dioxolanes (ketals) in neat (S)- or (RS)-1,2-propanediol containing dichloroacetic acid.The reactions follow the pseudo-first-order law at a given acid concentration, are inhibited by water, and proceed approximately twofold faster in (RS)-diol-O,O-d2 than in undeuterated diol.No difference in rates greater than 1percent could be detected between (S)- and (RS)-diols at identical temperatures, acid concentrations, and water concentrations.Thus, for a chiral diol molecule and the activated complex, free-energy differences are virtually the same in (S)- and (RS)-diols as solvents.Differences in interactions among identical and enantiomeric molecules, if any, are evidently matched by differences in the activated complexes.
Wynberg, Hans,Lorand, John P.
p. 2538 - 2542
(2007/10/02)

Investigation of the Effectiveness of Various 1-Dialkylamino-1-methoxycarbenium-Methyl Sulfates in the Course of Acetalization
The rate of dimethyl ketal formation from acetone and methanol in the presence of several 1-dialkylamino-1-methoxycarbenium methyl sulfates 1a, 5a-g is studied.The fastest rate was observed in the case of 5c.In the presence of 5c, the reaction of carbonyl compounds with either methanol or 1,2-diols gave the dimethyl ketals 6 and 1,3-dioxolanes 7, respectively.
Kantlehner, Willi,Gutbrod, Heinz-Dieter,Funke, Bernd
p. 246 - 252
(2007/10/02)