Catalytic activation of unstrained C(aryl)–C(aryl) bonds in 2,2′-biphenols
作者:Jun Zhu、Jianchun Wang、Guangbin Dong
DOI:10.1038/s41557-018-0157-x
日期:2019.1
install phosphinites as a recyclable directing group. Using hydrogen gas as the reductant, monophenols are obtained with a low catalyst loading and high functional group tolerance. This approach is also applied to the synthesis of 2,3,4-trisubstituted phenols. A further mechanistic study suggests that the C–C activation step is mediated by a rhodium(i) monohydride species. Finally, a preliminary study on
[EN] PRODUCTION OF HIGHLY PURE META,META-COUPLED BIS(4-ALKYLPHENOL) DERIVATIVES AND USES THEREOF<br/>[FR] PRODUCTION DE DÉRIVÉS DE BIS(4-ALKYLPHÉNOL) MÉTA,MÉTA-COUPLÉS TRÈS PURS ET LEURS UTILISATIONS
申请人:UNIV LEUVEN KATH
公开号:WO2018134427A1
公开(公告)日:2018-07-26
In general the present invention concerns a method for production of highly pure m,m'- coupled bis(4-alkylphenol) derivatives from particular lignin-derived 4-alkylphenol derivatives. More specifically this invention relates to a process for the selective purification of m,m'- coupled bis(4-alkylphenol) derivatives by selective crystallization in the presence of residual substrate and isomeric and/or oligomeric by-products/impurities. This new class of bis(4-alkylphenol)s are valuable precursors for renewable thermoplastics, (high temperature) resins/thermosets, bio-derived C15-C19 fuel additives, antioxidants, UV-stabilizers, plasticizers, soluble n-type perylene copolymers and/or positive working photoresists.
SULFAMOYLBENZAMIDE DERIVATIVES AS ANTIVIRAL AGENTS AGAINST HBV INFECTION
申请人:Guo Ju-Tao
公开号:US20140206666A1
公开(公告)日:2014-07-24
Pharmaceutical compositions of the invention comprise sulfamoylbenzamide derivative useful as pregenomic RNA encapsidation inhibitors, useful for the treatment of Hepatitis B virus (HBV) infection.
PROCESS FOR PRODUCING POLY (ALKYLENE OXIDE) IN THE PRESENCE OF A PHOSPHAZENIUM SALT OR COMPOUND
申请人:——
公开号:US20030105361A1
公开(公告)日:2003-06-05
The present invention provides a novel salt useful as an active species in an organic reaction and represented by the following chemical formula (1):
1
wherein n stands for an integer of from 1 to 8, Z
n−
represents an n-valent anion of an active hydrogen compound, a, b, c and d each stands for a positive integer, and Rs represent the same or different hydrocarbon groups. Also disclosed is a simple and efficient process for producing a poly(alkylene oxide) by polymerizing an alkylene oxide compound in the presence of the salt represented by the chemical formula (1).
A magnesium phenate is prepared by a process which comprises reacting (1) magnesium oxide, magnesium hydroxide, magnesium carbonate, magnesium bicarbonate or a magnesium carboxylate with (2) a phenol, a methylene bis-phenol or a sulphurised phenol in the presence of (3) a solvent comprising an organic compound containing one or more alcoholic hydroxyl groups e.g. an alkoxy alcohol and (4) a promoter selected from a ketone, diketone such as α or β diketone, aldehyde or carboxylic acid and (5) optionally a diluent oil. This magnesium phenate may be used as a detergent for a lubricating oil.