Stereospecific cyclodehydration of 1,4-sulfanylalcohols to thiolanes: mechanistic insights
作者:Jean-Jacques Filippi、Elisabet Duñach、Xavier Fernandez、Uwe J. Meierhenrich
DOI:10.1016/j.tet.2008.07.088
日期:2008.10
A series of thiolanes were prepared by cyclodehydration of sulfanylalcohols in the presence of catalytic amounts of p-toluenesulfonic acid or by using K10 clay. The sulfur heterocycles were synthesised in good to excellent yields using either a conventional Dean–Stark method or microwave irradiation under solvent-free conditions. The reaction could be performed regio- and stereoselectively and its
[EN] INTEGRATED PROCESS FOR PRODUCING CYCLIC ACETALS AND OXYMETHYLENE POLYMERS<br/>[FR] PROCÉDÉ INTÉGRÉ DE PRODUCTION D'ACÉTALS CYCLIQUES ET DE POLYMÈRES D'OXYMÉTHYLÈNE
申请人:TICONA GMBH
公开号:WO2013076288A1
公开(公告)日:2013-05-30
A process for producing cyclic acetals is described. A formaldehyde source is contacted with an aprotic compound in the presence of a catalyst to produce the cyclic acetals. The aprotic compound can increase conversion rates and/or efficiency. In one embodiment, the formaldehyde source is obtained from methanol. In particular, methanol can be converted into formaldehyde which is then converted into a cyclic acetal. In one embodiment, the cyclic acetal can then be used to produce oxymethylene polymers.
[EN] PROCESS FOR PRODUCING A CYCLIC ACETAL IN A HETEROGENEOUS REACTION SYSTEM<br/>[FR] PROCÉDÉ DE PRODUCTION D'UN ACÉTAL CYCLIQUE DANS UN SYSTÈME RÉACTIONNEL HÉTÉROGÈNE
申请人:TICONA GMBH
公开号:WO2013076290A1
公开(公告)日:2013-05-30
A process for producing a cyclic acetal is disclosed. According to the process, a formaldehyde source is combined with an aprotic compound and contacted with a heterogeneous catalyst which causes the formaldehyde source to convert into a cyclic acetal such as trioxane. The catalyst, for instance, may comprise a solid catalyst such as an ion exchange resin. In one embodiment, the process is used for converting anhydrous formaldehyde gas to trioxane. The anhydrous formaldehyde gas may be produced form an aqueous formaldehyde solution by an extractive distillation.
Ink jet ink compositions and processes for high resolution and high speed printing
申请人:XEROX CORPORATION
公开号:EP0853108A1
公开(公告)日:1998-07-15
A thermal ink jet printing comprises incorporating into a thermal ink jet printer at least one ink jet ink with an ink composition comprising water; a colorant of a dye or pigment; a hydroxyamide derivative having at least one hydroxyl group and at least one amide group or a reaction product of oxyalkylene(s) and the said hydroxyamide derivative; a sulfur-containing humectant that is a sulfoxide or a sulfone or a thiol derivative. Printing with the ink jet ink is according to digital signals with at least one printhead which is selected from a group consisting of single, partial-width, and full-width array printheads using a checkerboard or single pass method onto a print substrate either with or without the presence of heat for drying. The ink jet ink has a good latency, long-term jetting stability, and good image quality on plain papers when it is used in a high resolution thermal ink jet printhead including a 600 spi printhead.
Process for producing a cyclic acetal in a heterogeneous reaction system
申请人:Celanese Sales Germany GmbH
公开号:US10829467B2
公开(公告)日:2020-11-10
A process for producing a cyclic acetal is disclosed. According to the process, a formaldehyde source is combined with an aprotic compound and contacted with a heterogeneous catalyst which causes the formaldehyde source to convert into a cyclic acetal such as trioxane. The catalyst, for instance, may comprise a solid catalyst such as an ion exchange resin. In one embodiment, the process is used for converting anhydrous formaldehyde gas to trioxane. The anhydrous formaldehyde gas may be produced form an aqueous formaldehyde solution by an extractive distillation. The aprotic compound and the formaldehyde solution may be extracted from the reaction product and recycled into the process.