Iron(III)-Catalyzed Ortho-Preferred Radical Nucleophilic Alkylation of Electron-Deficient Arenes
作者:Fei Yu、Ting Wang、Huan Zhou、Yajun Li、Xinhao Zhang、Hongli Bao
DOI:10.1021/acs.orglett.7b03244
日期:2017.12.15
ortho-preferred, radical alkylation of electron-deficient (hetero)arenes is reported. A variety of electron-deficient arenes were shown to react with various primary alkyl sources, producing the alkylated (hetero)arenes in good yields. This reaction might be an alkyl radical, nucleophilic aromatic substitution reaction, rather than the traditional electrophilic Friedel–Crafts reaction. HOMO–LUMO analysis and
LATENT CURING AGENT AND CURABLE POLYURETHANE COMPOSITION
申请人:SIKA TECHNOLOGY AG
公开号:US20200140599A1
公开(公告)日:2020-05-07
A compound of formula (I) having advantageous properties when used as a latent curing agent for compositions containing isocyanate groups, and to compositions containing the compound of formula (I). The compound of formula (I) is odourless, is liquid and has comparatively low viscosity at room temperature and is stable in storage together with isocyanates. It makes possible odourless single-component polyurethane compositions which have good stability in storage, do not produce bubbles when cured in the presence of moisture, and cause no problematic odour emissions, giving a cured elastic material having good mechanical properties, good heat stability, a surprisingly non-adhesive surface and little tendency towards plasticizer migration.
A polyaldimine of the formula (I) with advantageous properties in use as latent hardener for compositions including isocyanate groups, and compositions containing the polyaldimine of the formula (I) and at least one polyisocyanate and/or at least one polyurethane polymer containing isocyanate groups. The polyaldimine of the formula (I) is odourless, pH-neutral, liquid at room temperature, has low viscosity, has little sensitivity to heat and moisture, and is stable in storage together with isocyanates. It can provide odourless single-component polyurethane compositions which have good stability in storage and which do not produce bubbles when hardened in the presence of moisture, and which cause no problematic odour emissions, giving a hardened elastic material with good mechanical properties and surprisingly little tendency towards plasticizer migration.
AROMATIC ALDEHYDE, AND EPOXY RESIN CURING AGENT AND EPOXY RESIN COMPOSITION COMPRISING THE AROMATIC ALDEHYDE
申请人:Mitsubishi Gas Chemical Company, Inc.
公开号:US20150111991A1
公开(公告)日:2015-04-23
There are provided a novel aromatic aldehyde compound capable of providing an epoxy resin coating film and an epoxy resin cured material satisfying all of the excellent surface property (smoothness, gloss), drying property, water resistance, transparency and adhesion, and an epoxy resin curing agent and an epoxy resin composition containing the aromatic aldehyde compound. The aromatic aldehyde has a branched alkyl group having 10 to 14 carbon atoms.
AROMATIC ALDEHYDE, EPOXY RESIN CURING AGENT COMPRISING AROMATIC ALDEHYDE, AND EPOXY RESIN COMPOSITION COMPRISING SAME
申请人:Mitsubishi Gas Chemical Company, Inc.
公开号:EP2857378A1
公开(公告)日:2015-04-08
There are provided a novel aromatic aldehyde compound capable of providing an epoxy resin coating film and an epoxy resin cured material satisfying all of the excellent surface property (smoothness, gloss), drying property, water resistance, transparency and adhesion, and an epoxy resin curing agent and an epoxy resin composition containing the aromatic aldehyde compound. The aromatic aldehyde has a branched alkyl group having 10 to 14 carbon atoms.