Process for the preparation of halogenated (meth)acrylic esters and poly (meth) arcylates obtained with said (meth)acrylic esters
申请人:Akzo Nobel N.V.
公开号:EP0824096A2
公开(公告)日:1998-02-18
The present invention is directed to a process for the preparation of (meth)acrylates of halogenated alcohols by direct esterification of said alcohols with (meth)acrylic acid (chloride) wherein at least 2,6-substituted pyridine derivative is used as a polymerization inhibitor at room temperature or lower. Suitable at least 2,6-substituted pyridine derivatives are 2,6-lutidine, 2,4,6-collidine or 2,6-di-tert.butyl-4-methyl pyridine.
With the halogenated (meth)acrylate esters prepared with the process according to the invention, very pure homo- and copolymers can be prepared, resulting in polymers having a low optical loss of 0.1 dB/cm or lower at 1300 nm and lower than 0.4 dB/cm at 1550 nm.
We report on a series of novel 5,6-disubstituted uracils with significant inhibitory activity against human and Escherichia coli thymidine phosphorylases. Bis-uracil conjugates were identified as the most potent inhibitors of TPs in this study.
Verfahren zur Herstellung von 2,4-Dihydroxypyrimidinen
申请人:BAYER AG
公开号:EP0182190A2
公开(公告)日:1986-05-28
2,4-Dihydroxypyrimidine der Formel
mit den in der Beschreibung angegebenen Substituentenbedeutungen erhält man durch Umsetzung von Pyrimidinen der Formel
mit den in der Beschreibung angegebenen Substituentenbedeutungen mit wäßrigen Alkalien bei erhöhter Temperatur. Aus den Dihydroxypyrimidinen erhält man durch Umsetzung mit Hydroxy/Chlor-Austauschreagentien 2,4,5,6-Tetrachlorpyrimidin.
PROCESS FOR PRODUCING TRICHLOROPYRIMIDINE COMPOUND
申请人:Sumitomo Chemical Company, Limited
公开号:EP2128141A1
公开(公告)日:2009-12-02
A process for producing a trichloropyrimidine compound represented by the formula (2):
wherein R represents a hydrogen atom etc., comprising reacting a dihydroxypyrimidine compound represented by the formula (1):
wherein R represents the same meaning as above, with sulfuryl chloride and at least one chlorinating agent selected from the group consisting of hydrogen chloride, thionyl chloride, phosgene, phosphorus oxychloride, phosphorus pentachloride and phosphorus trichloride in the presence of an organic base.