potassium formate is described. With the aid of metal/NH cooperation, the C–N chelating Ir complexes derived from benzylic amines can efficiently promote the reduction involving the C–F bond cleavage under ambient conditions even in the absence of hydrosilanes or H2 gas, leading to the partiallyfluorinated products in good yields and with high selectivity.
The metal-free catalytic C–F bond activation of polyfluoroarenes was achieved with diazaphospholene as the catalyst and phenylsilane as the terminal reductant. Density functional theory calculations suggested a concerted nucleophilic aromatic substitution mechanism.
A transition‐metal‐free catalytic hydrodefluorination (HDF) reaction of polyfluoroarenes is described. The reaction involves direct hydride transfer from a hydrosilicate as the key intermediate, which is generated from a hydrosilane and a fluoride salt. The eliminated fluoride regenerates the hydrosilicate to complete the catalytic cycle. Dispersion‐corrected DFT calculations indicated that the HDF
描述了多氟芳烃的无过渡金属催化加氢脱氟(HDF)反应。该反应涉及从氢硅酸盐作为主要中间体的氢化物直接转移,这是由氢硅烷和氟化物盐生成的。除去的氟化物使氢硅酸盐再生,从而完成催化循环。分散校正的DFT计算表明HDF反应通过协调的亲核芳族取代(CS N Ar)过程进行。
Process for selective hydrodefluorination
申请人:Occidental Chemical Corporation
公开号:EP0563986A2
公开(公告)日:1993-10-06
A process for the selective hydrodefluorination of a tetrafluorophthalimide compound of the formula
where X is 1 and R is a monovalent organo group; or X is 2 and R is a divalent organo group; comprises reacting (I) the tetrafluorophthalimide with zinc in an aqueous alkali metal hydroxide medium. The product may be hydrolyzed to form 3,4,6-trifluorophthalic acid.
式中 X 为 1,R 为一价有机基团;或 X 为 2,R 为二价有机基团的四氟邻苯二甲酰亚胺化合物的选择性加氢脱氟工艺。
其中 X 为 1,R 为一价有机基团;或 X 为 2,R 为二价有机基团;该工艺包括 (I) 四氟邻苯二甲酰亚胺与锌在碱金属氢氧化物水介质中反应。产物可水解生成 3,4,6-三氟邻苯二甲酸。
Method for producing of phthalocyanine compound
申请人:NIPPON SHOKUBAI CO., LTD.
公开号:EP0882768A2
公开(公告)日:1998-12-09
A method for producing a novel phthalocyanine compound which excels in yield and purity, allows no introduction of a chlorine atom into the phthalocyanine skeleton, and possesses relatively bulky substituents is provided.
This method is characterized by causing an orthophthalonitrile compound having a substituent exhibiting smaller σp values than σm values in the Hammett's rule to react with a metal oxide in the presence of a compound forming in the aqueous solution thereof at 25°C an acid or conjugate acid having a dissociation index pKa (the logarithmic value of the reciprocal of the dissociation constant of the acid or conjugate acid) of not more than 7.0.