Catalytic C–N and C–H Bond Activation: ortho-Allylation of Benzoic Acids with Allyl Amines
摘要:
A facile insertion of ruthenium into aromatic C-H and allylic C-N bonds are the key steps in a [Ru(p-cymene)Cl-2](2)-catalyzed ortho-C-H allylation of benzoic acids. This protocol allows drawing on the large pool of allylic amines for state-of-the-art ortho-functionalizations of arenes, turning neutral amines into leaving groups. Concise syntheses of biologically active compounds provide further evidence of the synthetic potential of this methodology.
Carboxylate-directed C–H allylation with allyl alcohols or ethers
作者:Xiao-Qiang Hu、Zhiyong Hu、A. Stefania Trita、Guodong Zhang、Lukas J. Gooßen
DOI:10.1039/c8sc01741g
日期:——
A [Ru(p-cymene)Cl2]2 catalyst activates allylalcohols and ethers for the regioselective ortho-C–H allylation of aromatic and heteroaromatic carboxylates. The reaction is orthogonal to most C–H functionalisations with allylalcohols in that allyl arenes rather than carbonyl compounds are obtained. A wide range of substrates are thus smoothly transformed to allylarenes at 50 °C in phosphate-buffered
Stabilized thermoplastic composition, method of making, and articles formed therefrom
申请人:Glasgow Katherine
公开号:US20070082989A1
公开(公告)日:2007-04-12
A thermoplastic composition comprises a polycarbonate, an ionizing radiation stabilizing additive, and a poly-substituted aromatic compound of formula:
wherein X is an aryl group; Y is a non-hydrogen substituent group, a is 1 to 4, b is 0 to 4, a+b is less than or equal to 4, and c is 0 or 1; and wherein the amounts and identities of the polycarbonate, ionizing radiation stabilizing additive, and poly-substituted aromatic compound are selected such that a molded article having a thickness of 3.18 millimeters and comprising the thermoplastic composition has, after exposure to gamma radiation at 83 kGy and when measured according to ASTM D1925-70, an increase in yellowness index (dYI) of less than or equal to 50, when compared to the unexposed thermoplastic composition.
A process for preparing a substantially saltfree N-acyl taurine by reacting 1 mole of a higher molecular weight carboxylic acid chloride with 1 mole of a taurine salt containing at least 1 N-bonded H atom in a lower alkanol initially containing no more than about 15% by weight of water and about 1 mole of an alkali metal hydroxide at elevated temperatures, preferably at reflux, separating the insoluble precipitated alkali metal chloride from the alkanolic reaction medium at a temperature high enough to solubilize the N-acyl taurine reaction product, and cooling the reaction medium low enough to precipitate the desired N-acyl taurine.
一种制备基本上不含盐的 N-酰基牛磺酸的工艺,其方法是:在最初含有不超过约 15%(重量)水和约 1 摩尔碱金属氢氧化物的低级烷醇中,使 1 摩尔较高分子量的羧酸氯化物与 1 摩尔含有至少 1 个 N 键 H 原子的牛磺酸盐在高温下反应、最好在回流条件下,在足以溶解 N-酰基牛磺酸反应产物的高温下,将不溶解的沉淀碱金属氯化物从烷醇反应介质中分离出来,并将反应介质冷却到足以沉淀出所需的 N-酰基牛磺酸的低温。
Method for production of carbon black graft polymer
申请人:NIPPON SHOKUBAI CO., LTD.
公开号:EP0749991A2
公开(公告)日:1996-12-27
A method for the production of a carbon black graft polymer by the reaction of carbon black and a polymer (A) having an epoxy group and/or a thioepoxy group, which method is characterized by the fact that the reaction of carbon black and the polymer (A) is carried out by means of a continuous kneading device and the polymer (A) fed to the continuous kneading device is in such a state that the effective pendant number (Peff) represented by the following formula falls in the range of 0.5 ∼ 1.3 per moleculePeff = Mn/(E - Ac)
(wherein Mn represents the number average molecular weight of the polymer (A), E the number or mols of the epoxy group and/or the thioepoxy group per g of the polymer (A), and Ac the number of mols of the epoxy- or thioepoxy-reactive group per g off the polymer (A)).
Kosmetische und dermatologische Lichtshutzformulierungen mit einem Gehalt an Benzotriazolderivaten und Alkylnapthalaten
申请人:Beiersdorf AG
公开号:EP1127568A2
公开(公告)日:2001-08-29
Lichtschutzwirksame Wirkstoffkombinationen aus
(a) einer oder mehreren UV-Filtersubstanzen, gewählt aus der Gruppe der Benzotriazolderivate und
(b) einem oder mehreren Dialkylnaphthalaten, welche sich durch die Strukturformel
worin R1 und R2 unabhängig voneinander gewählt werden aus der Gruppe der verzweigten und unverzweigten Alkylgruppen mit 6 bis 24 Kohlenstoffatomen.