Iron-Catalyzed, Site-Selective Difluoromethylthiolation (−SCF<sub>2</sub>H) and Difluoromethylselenation (−SeCF<sub>2</sub>H) of Unactivated C(sp<sup>3</sup>)–H Bonds in <i>N</i>-Fluoroamides
作者:Hongwei Zhang、Fei Yu、Chuang Li、Peiyuan Tian、Yulu Zhou、Zhong-Yan Cao
DOI:10.1021/acs.orglett.1c01443
日期:2021.6.18
The iron-catalyzed δ-C(sp3)–H bond difluoromethylthiolation and difluoromethylselenation of aliphatic amides with high site selectivity are reported. Essential to the success is the employment of an amide radical formed in situ to activate the inert C(sp3)–H bond and the utilization of the easily handled PhSO2SCF2H and PhSO2SeCF2H as coupling reagents under mild conditions. This scalable protocol exhibits
报道了铁催化的 δ-C(sp 3 )-H 键二氟甲硫基化和脂肪族酰胺的二氟甲基硒化,具有高位点选择性。成功的关键是使用原位形成的酰胺自由基来激活惰性 C(sp 3 )-H 键,并在温和条件下使用易于处理的 PhSO 2 SCF 2 H 和 PhSO 2 SeCF 2 H 作为偶联剂. 这种可扩展的协议展示了具有多功能功能组的广泛基板范围。机理研究表明,反应通过-SCF 2 H 和-SeCF 2 H 自由基转移进行。
(1-Selenocyanatoethyl)benzene: A Selenocyanation Reagent for Site-Selective Selenocyanation of Inert Alkyl C(sp<sup>3</sup>)–H Bonds
作者:Fei Yu、Chuang Li、Chuangye Wang、Hongwei Zhang、Zhong-Yan Cao
DOI:10.1021/acs.orglett.1c02564
日期:2021.9.17
Addition of Grignard and organolithium reagents to N-sulfonyl aldimines generated in situ from aldehydes and N-sulfinylsulfonamides
作者:Joseph Sisko、Steven M. Weinreb
DOI:10.1021/jo00288a080
日期:1990.1
[EN] CELLULOSE ACYLATE FILM, METHOD OF PRODUCING THE SAME, CELLULOSE DERIVATIVE FILM, OPTICALLY COMPENSATORY FILM USING THE SAME, OPTICALLY-COMPENSATORY FILM INCORPORATING POLARIZING PLATE, POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY DEVICE<br/>[FR] FILM EN ACYLATE DE CELLULOSE, METHODE DE PRODUCTION DE CE FILM, FILM EN DERIVE DE CELLULOSE, FILM OPTIQUEMENT COMPENSATOIRE FAISANT APPEL A CE DERNIER, FILM OPTIQUEMENT COMPENSATOIRE INTEGRANT UNE PLAQUE DE POLARISATION, PLAQUE DE POLARISATION ET DIS
申请人:FUJIFILM CORP
公开号:WO2007061139A1
公开(公告)日:2007-05-31
[EN] A method of producing a cellulose derivative film, the method comprising: forming a film with a solvent cast method from a dope including a cellulose derivative satisfying following conditions (a) and (b): (a) at least one among three hydroxyl groups included in a glucose unit of cellulose is substituted by a substituent of which a polarizability anisotropy ?a represented as following Expression (1) is 2.5-x10-24 cm³ or higher: Expression (1): ?a =ax- (ay+ az)/2, wherein ax, ay and az is as defined in the specification; and (b) when a substitution degree by a substituent of which ?a is 2.5x10-24 cm³ or higher is PA, and a substitution degree by a substituent of which ?a is lower than 2.5x10-24 cm3 is PB, the PA and PB satisfy following Expressions (3) and (4): Expression (3): 2PA + PB > 3.0; and Expression (4): PA > 0.2. [FR] L'invention concerne une méthode de production d'un film en dérivé de cellulose. Cette méthode consiste à: former un film à l'aide d'une méthode de coulage de solvant, à partir d'un dopant comprenant un dérivé de cellulose satisfaisant les conditions (a) et (b). Les conditions (a) et (b) sont décrites comme suit: (a) au moins un groupe parmi les trois groupes hydroxyle compris dans une unité de glucose de la cellulose est substitué par un substituant dont une anisotropie de polarisabilité ?areprésentée par l'expression (1) est supérieure ou égale 2,5-x10-24