Synthesis of 4-ketocyclopentene and cyclopentadiene compounds
申请人:——
公开号:US20020002308A1
公开(公告)日:2002-01-03
A process for forming 4-ketocyclopentene and substituted 4-ketocyclopentene compounds starting from the corresponding 1-carbohydrocarbyloxy-2-keto-4-hydroxy-5-cyclopentene by reduction followed by decarboxylation using zinc dichloride or zinc dibromide. The ketone may thereafter be converted to a cyclopentadiene compound by reducing the ketone to form an alcohol, replacing the hydroxyl functionality of the alcohol under substitution conditions with a leaving group, and deprotonating the resulting product under base induced elimination conditions to form the cyclopentadiene compound. Alternatively functionalized cyclopentadienyl compounds can be produced without isolation of an unsubstituted cyclopentadienyl compound by combining the elimination and deprotonation steps with a replacement step in a single unit operation.
A method of producing an organic compound, which contains a step of performing a deodorization step using a flow reaction in a flow passage to remove, from a reaction liquid, a malodorous material generated or remaining in a reaction step,
wherein the organic compound is an industrially useful compound.
The novel process for preparing dialkyl dicarbonates by reacting the corresponding alkyl haloformates with alkali metal hydroxides, alkaline earth metal hydroxides and/or carbonates in the presence of water-immiscible organic solvents and in the presence of a catalyst is characterized in that the catalyst used is at least one tertiary alkylamine of the formula (I)
NR
1
R
2
R
3
(I),
where the substituents are each as defined in the description.
BILAYER MEMBRANES PREPARED FROM MODIFIED DIALKYLAMMONIUM SALTS AND METHYLDIALKYLSULFONIUM SALTS
作者:Toyoki Kunitake、Yoshio Okahata
DOI:10.1246/cl.1977.1337
日期:1977.11.5
Electron microscopy showed that modified dialkylammonium salts and methyldialkylsulfonium salts formed bilayers in dilute aqueous solutions. The effect of polar head groups on the aggregation properties of the amphiphiles was discussed.
[DE] VERFAHREN ZUR HERSTELLUNG VON DIALKYLDICARBONATEN<br/>[EN] METHOD FOR PRODUCING DIALKYL DICARBONATES<br/>[FR] PROCEDE POUR LA PRODUCTION DE BICARBONATES DE DIALKYLE
申请人:LANXESS DEUTSCHLAND GMBH
公开号:WO2005110964A1
公开(公告)日:2005-11-24
Das neue Verfahren zur Herstellung von Dialkyldicarbonaten durch Umsetzung der entsprechenden Halogenameisensäurealkylester mit Alkali- oder Erdalkalihydroxiden und/oder -carbonaten in Gegenwart von mit Wasser nicht mischbaren organischen Lösungsmitteln und in Gegenwart eines Katalysators ist dadurch gekennzeichnet, dass als Katalysator mindestens ein tertiäres Alkylamin der Formel (I) NR1R2R3 (I), worin die Substituenten die in der Beschreibung angegebene Bedeutung haben, eingesetzt wird.