Production method of fluorinated purine nucleoside derivative, intermediate therefor and production method thereof
申请人:Ajinomoto Co., Inc.
公开号:EP1816135A1
公开(公告)日:2007-08-08
Purine nucleosides which are fluorinated at the 3'-position (preferably the α-position), may be economically and efficiently produced by fluorinating a novel purine nucleoside derivative (1) in which the hydroxyl group at the 5'-position is protected to obtain a novel purine nucleoside derivative (2) in a high yield. The derivative (2) is subjected to desulfurization, deprotection of R1 and, as necessary protection, deprotection, or modification of nucleic acid base moiety, to obtain the desired purine nucleoside (3).
wherein each symbol is as defined in the specification.
Modified silicon dioxide material of fluorocarbon active agent type super-amphiphobic cutting-carrying agent suitable for water-based drilling fluid and preparation method thereof
申请人:CHINA UNIVERSITY OF PETROLEUM (BEIJING)
公开号:US10876034B1
公开(公告)日:2020-12-29
The present disclosure relates to the technical field of oil and gas drilling, and particularly relates to a modified silicon dioxide material of a fluorocarbon active agent type super-amphiphobic cutting-carrying agent suitable for a water-based drilling fluid, and a preparation method thereof. The preparation method of the modified silicon dioxide material comprises the following steps: subjecting silicon dioxide and a silane coupling agent represented by Formula (1) to a first contact reaction in a mixed solvent containing alcohol and water; subjecting the product of the first contact reaction, the compound represented by Formula (2) and the compound represented by Formula (3) to a second contact reaction; subjecting the product of the second contact reaction and the compound represented by Formula (4) to a third contact reaction. The modified silicon dioxide material can be used as a cutting-carrying agent in a water-based drilling fluid and produce an excellent cutting-carrying effect.
METHOD FOR PRODUCING TRIS(PERFLUOROALKANESULFONYL)METHIDE ACID SALT
申请人:Central Glass Company, Limited
公开号:EP2080753B1
公开(公告)日:2012-02-15
Method for Producing Tris(Perfluoroalkanesulfonyl)Methide Acid Salt
申请人:Nanmyo Tsutomu
公开号:US20100022803A1
公开(公告)日:2010-01-28
There is provided a method for producing a tris(perfluoroalkanesulfonyl)methide acid salt represented by formula [1], including the steps of (a) reacting a methylmagnesium halide represented by formula [2] with a perfluoroalkanesulfonyl fluoride represented by formula [3], thereby obtaining a reaction mixture; and (b) directly reacting the obtained reaction mixture with at least one selected from the group consisting of alkali metal halides, quaternary ammonium salts, and quaternary phosphonium salts. By this method, it is possible to easily produce the target methide acid salt with high yield.