Methods for Producing Fluorine-Containing Hydroxyaldehyde, Fluorine-Containing Propanediol, and Fluorine-Containing Alcohol Monomer
申请人:Central Glass Company, Limited
公开号:US20150361026A1
公开(公告)日:2015-12-17
As shown by the following reaction formula, disclosed is a fluorine-containing hydroxyaldehyde production method, including the step of obtaining a fluorine-containing hydroxyaldehyde represented by the general formula (1) by reacting a fluorine-containing ketone represented by the general formula (4) and an aldehyde represented by the general formula (5) in the presence of an organic base selected from a heterocyclic compound which contains a nitrogen atom in its ring or a tertiary amine. By this production method, it is possible to obtain the fluorine-containing hydroxyaldehyde in a high yield. Furthermore, it is possible to easily obtain in high yields a fluorine-containing propanediol, which is a derivative of this fluorine-containing hydroxyaldehyde, and a fluorine-containing alcohol monomer by using the same.
Radical scavenging of four tea catechins, (-)-epicatechin (EC), (-)-epigallocatechin (EGC), (-)-epicatechin gallate (ECg) and (-)-eppigallocatechin gallate (EGCg), and the model compounds of their partial structure was examined against the 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical using stopped-flow and spectrophotometric methods. The number of DPPH radicals scavenged by a polyphenol molecule was larger than that of phenolic hydroxyl groups, suggesting that hydrogens which bond directly to the aromatic ring can also participate in radical scavenging. A model for the scavenging reaction was proposed in which the reaction proceeded with successive dehydrogenation from a polyphenol molecule. Analysis of the second order reaction rate constants and the activation parameters between DPPH and polyphenol at the early stage of the reaction showed that the values depended on the number of phenolic hydroxyl groups and their mutual position. Contribution of the A ring of catechins to the rate constants was estimated to be far smaller than that from the B ring. In the EGCg molecule, the B ring and the gallate group were not independent, but acted as a single group for DPPH radical scavenging.
Processes for producing fluorine-containing 2,4-diols and their derivatives
申请人:Komata Takeo
公开号:US20050215836A1
公开(公告)日:2005-09-29
A process for producing a fluorine-containing 2,4-diol represented by the formula [4],
wherein R
1
represents a hydrogen atom or an acyclic or cyclic alkyl group having a carbon atom number of 1 to 7; R
2
represents an acyclic or cyclic alkyl group having a carbon atom number of 1 to 7, a phenyl group, or a substituted phenyl group; and R
1
and R
2
are optionally bonded to each other to form a ring, includes reducing a hydroxy ketone represented by the formula [3],
wherein R
1
and R
2
are defined as above, by hydrogen in the presence of a ruthenium catalyst.
Process for producing alpha-substituted acrylic norbornanyyl compounds
申请人:Komata Takeo
公开号:US20050131248A1
公开(公告)日:2005-06-16
A process for producing an α-substituted acrylic norbornanyl compound represented by the formula [3] includes reacting an α-substituted acrylic acid anhydride represented by the formula [1] with a substituted norbornanyl alcohol represented by the formula [2].
wherein R
1
represents a hydrogen atom, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group, fluoromethyl group, difluoromethyl group, trifluoromethyl group, or perfluoroethyl group, and wherein one of R
2
, R
3
and R
4
is a CF
3
C(CF
3
)(OH)CH
2
— group, and each of the other two of R
2
, R
3
and R
4
is a hydrogen.
Novel Water-Soluble Diorganyl Tellurides with Thiol Peroxidase and Antioxidant Activity
作者:Takahiro Kanda、Lars Engman、Ian A. Cotgreave、Garth Powis
DOI:10.1021/jo990842k
日期:1999.10.1
at pH = 7.4 by using the coupled GSSG reductase assay. Dialkyl telluride 10 turned out to be the most efficient catalyst. Several alkylaryl tellurides 8 were also more efficient than any of the previously tested organotellurium compounds in this model. Bulky and electron-withdrawing aryl substituents seemed to reduce activity, whereas electron-donating groups enhanced it. Alkylaryl selenide 9 was