Light-Enabled Radical 1,4-Aryl Migration Via a Phospho-Smiles Rearrangement
作者:Maxime De Abreu、Philippe Belmont、Etienne Brachet
DOI:10.1021/acs.joc.0c02540
日期:2021.3.5
Rearrangement reactions in organic chemistry are attractive strategies to build efficiently complex scaffolds, in just one step, from simple starting materials. Among them, aryl migrations are certainly one of the most useful and straightforward rearrangement for building attractive carbon–carbon bonds. Of note, anionicaryl migration reactions have been largely described compared to their radical
Phosphoramidates as Transient Precursors of Nitrogen‐Centered Radical Under Visible‐Light Irradiation: Application to the Synthesis of Phthalazine Derivatives
作者:Maxime De Abreu、Mohamed Selkti、Philippe Belmont、Etienne Brachet
DOI:10.1002/adsc.202000018
日期:2020.5.26
N‐Centered Radical (NCR) precursors under visible‐light irradiation. More precisely among this class of phosphorus‐derived compounds, we studied the radical reactivity of phosphonohydrazones, under mild reaction conditions, which allowed the synthesis of a wide and diversified library of the scarcely reported phthalazine scaffold. Mechanistic investigations confirmed the formation of a NCR from these brand‐new
Storage stable compositions are disclosed which comprise an epoxide containing compound, a phenolic hydroxyl containing compound, and a catalyst compound for catalyzing the reaction between epoxide groups and aromatic hydroxyl groups which catalyst comprises the product resulting from contacting an onium compound, non-heterocyclic amine compound, heterocyclic nitrogen compound or salt thereof with an acid or a salt of an acid having a weak nucleophilic anion.
Latent catalysts, cure-inhibited epoxy resin compositions and laminates prepared therefrom
申请人:THE DOW CHEMICAL COMPANY
公开号:EP0458502A2
公开(公告)日:1991-11-27
In summary, the application is related to the discovery of a class of compounds which comprises boric acid or maleic acid or a mixture of boric acid with at least one acid having a weak nucleophilic anion, which inhibits the reaction of a polyepoxide with a curing agent at low temperatures. In another embodiment the application is a latent catalyst system adapted for curing a polyepoxide resulting from contacting I) a catalyst for the cure of a polyepoxide compound comprising an amine, heterocyclic nitrogen phosphine, sulfide, phosphine, sulfide, ammonium, phosphonium, sulfonium, arsonium, containing compound or a mixture thereof; with II) boric acid, or a mixture of boric acid with at least an acid having a weak nucleophilic anion. Further the application relates to epoxy resin compositions containing the inhibitor or latent catalytic composition. In still another embodiment the application relates to a composition useful for curing a polyepoxide which contains: A) an inhibiting amount of boric acid or maleic acid or a mixture of boric acid with at least one acid having a weak nucleophilic anion; and optionally B) a catalytic amount of a catalyst useful for accelerating the reaction of a polyepoxide with the curing agent, wherein the inhibitor and catalyst may be present in complex form.
总之,本申请涉及一类化合物的发现,该化合物由硼酸或马来酸或硼酸与至少一种具有弱亲核阴离子的酸的混合物组成,在低温下可抑制聚环氧化物与固化剂的反应。在另一个实施方案中,本申请涉及一种潜伏催化剂系统,该系统适用于固化聚环氧乙烷,该固化聚环氧乙烷化合物的催化剂包括胺、杂环含氮膦、硫化物、膦、硫化物、铵、鏻、锍、胂、含化合物或其混合物;与 I) 硼酸或硼酸与至少一种具有弱亲核阴离子的酸的混合物接触后产生的聚环氧乙烷。此外,本申请还涉及含有抑制剂或潜在催化成分的环氧树脂组合物。在另一个实施方案中,本申请涉及一种用于固化聚环氧树脂的组合物,该组合物含有A) 抑制量的硼酸或马来酸或硼酸与至少一种具有弱亲核阴离子的酸的混合物;以及 B) 催化量的催化剂,用于加速聚环氧化物与固化剂的反应,其中抑制剂和催化剂可以复合物形式存在。
Catalysts and epoxy resin composition containing the same
申请人:THE DOW CHEMICAL COMPANY
公开号:EP0553887A2
公开(公告)日:1993-08-04
Storage stable compositions are disclosed which comprise an epoxide containing compound, a phenolic hydroxyl containing compound, and a catalyst compound for catalyzing the reaction between epoxide groups and aromatic hydroxyl groups which catalyst comprises the product resulting from contacting an onium compound, non-heterocyclic amine compound, heterocyclic nitrogen compound or salt thereof with an acid or a salt of an acid having a weak nucleophilic anion.