A simple, highly efficientsynthesis of a series of novel chiral non-racemic rigid tetracyclic phosphorus ligands, applicable in important chemical asymmetric transformations, was performed. In a tandem cross-coupling/C-H bond activation reaction, a well-recognised and readily available ligand (R,R)-NORPHOS was used as the starting material. The palladium complexes of new ligands were obtained and
The rearrangement of aromatic nitro compounds. Part 3. The mechanism of rearrangement of nitrated hydrocarbons in trifluoromethanesulphonic acid
作者:John V. Bullen、John H. Ridd、Omaima Sabek
DOI:10.1039/p29900001681
日期:——
1,3-Dialkyl-2-nitrobenzenes (C6H3R2NO2; R = Me, Et, and Pri) rearrange in trifluoromethane-sulphonic acid to the corresponding 4-nitro derivatives; with R = Et, this reaction is accompanied by dehydration to 7-ethyl-3-methylanthranil. The reaction rate increases markedly with the size of the alkyl group; with R = Me, the reaction was studied at 110 °C but, with R = Pri, temperatures of 36–54 °C were
1,3-二烷基-2-硝基苯(C 6 H 3 R 2 NO 2; R = Me,Et和Pr i)在三氟甲烷磺酸中重排为相应的4-硝基衍生物;当R = Et时,该反应伴随脱水成7-乙基-3-甲基蒽。反应速度随着烷基的大小而显着增加。在R = Me的情况下,在110°C下研究了反应,但是在R = Pr i的情况下,使用了36–54°C的温度。R = Me的研究表明反应是一阶反应,速率系数(k 1)随着溶液的酸度[d(log k 1)/ d(– H 0)迅速增加。)] = 1.45,随着酸度降低至0.49。用2 H和15 N进行的双标记实验表明该反应是分子内的。在这些条件下,1,2,4-三甲基-3-硝基苯也重排,主要得到5-硝基异构体。根据硝基的直接1,3-转移来讨论以上结果。
The application relates to 2-amino-4-(substituted amino)phenyl carbamate derivatives, or pharmaceutically acceptable salts or solvates thereof, as KCNQ2/3 potassium channel modulators, and methods of their uses.
Binäre Diketopyrrolopyrrol-Pigmentzusammensetzung zur Verwendung in Colorfiltern
申请人:Clariant International Ltd.
公开号:EP2146230A2
公开(公告)日:2010-01-20
Binäre Pigmentzusammensetzung aus Verbindungen der Formel (I) und (II), gekennzeichnet durch eine mittlere Teilchengröße d50 von 10 bis 60 nm, wobei weniger als 5 Volumen-% der Teilchen größer als 70 nm sind, wobei das Massenverhältnis von Verbindung der Formel (I) zu Verbindung der Formel (II) 99,5 zu 0,5 bis 80 zu 20 ist,
worin
n eine Zahl von 0 bis 4 darstellt; und
X OH, F, Cl, Br, CN, CF3, Nitro, C1-C8-Alkyl, C5-C7-Cycloalkyl, C2-C8-Alkenyl, C1-C8-Alkoxy, Phenyl oder Benzyl ist.