描述了由六氢化物配合物OsH 6(P i Pr 3)2(1)促进的烷基腈向对称和不对称仲脂肪族仲胺的转化,并建立了涉及的反应机理。配合物1催化具有直链或支链的芳基,吡啶基和烷氧基官能化的烷基腈的上述转化。仲胺的形成涉及伯亚胺,伯胺和仲亚胺作为有机中间体。反应在温和的条件下(甲苯,100°C和4 bar H 2)进行。1的化学计量反应与新戊腈和2-甲氧基乙腈一起使我们能够分离三氢化物氮杂亚乙烯基衍生物OsH 3 {═N═CHR}(P i Pr 3)2(R = t Bu(3),CH 2 OMe(4))。它们的形成涉及将底物的N–C三键插入不饱和四氢化物OsH 4(P i Pr 3)2(A)的Os–H键中,这是通过从六氢化合物中消除H 2产生的前体。这些三氢化物氮杂亚乙烯基物质与H 2的反应是还原腈的N-C三键的关键步骤。在没有H 2的情况下,A对氮杂亚乙烯基配体的攻击会导致其C(sp 2)–C(sp
DOI:
10.1021/acs.organomet.0c00236
作为试剂:
描述:
2,4-二氯-3,5-二硝基三氟甲苯 、 甲烷 、 二正丙胺 在
乙醚 、 二正丙胺盐酸盐 、 乙醇 作用下,
以
乙醇 为溶剂,
反应 98.0h,
以to give the product (6.77 grams) as a viscous reddish oil的产率得到3-氯-2,6-二硝基-N,N-二丙基-4-(三氟甲基)苯胺
Russell-Jones theory for the dissociative volatilization process and a standard approach based on the Arrhenius model. The values of the parameters characterizing the thermal properties of alkanaminium hexachlorostannates, i.e. temperatures of the thermal effects, and the thermochemical and kinetic constants of thermolysis, depend on the number, length and structure of the alkyl substituent. The essential
摘要 热分析方法(DTA、TG 和 DTG)用于研究具有通式 [(CnH2n+1)pNH4-p]2SnCl6(其中 n = 1–4 和 p = 2–4)的无支链复合盐的热行为和其他几种环状和开链支链脂肪族链烷胺六氯锡酸盐。这些化合物的热解离通常可以使用等式来概括,其中 A 表示烷基(a = 0 和 s = 1 表示季铵盐,a = 1 和 s = 0 表示其他研究的化合物)。具有简单结构的衍生物的热解发生在一个步骤中并导致它们的完全挥发。其他化合物的分解,通常具有复杂的结构,伴随着副反应。实验 TG 曲线用于检查热解的热力学和动力学。热解离焓基于范特霍夫方程进行评估。导出的值与可用的文献数据一起用于确定盐的形成焓和晶格能。后者的数量也使用 Kapustinskii-Yatsimirskii 公式进行了检查。使用Jacobs 和Russell-Jones 解离挥发过程理论和基于Arrhenius
Direct Preparation of Amides from Amine Hydrochloride Salts and Orthoesters: A Synthetic and Mechanistic Perspective
作者:Martin J. Di Grandi、Caitlin Bennett、Kristen Cagino、Arnold Muccini、Corey Suraci、Shahrokh Saba
DOI:10.1080/00397911.2015.1096943
日期:2015.11.17
Abstract The conversion of a wide range of primary and secondary aliphatic and a few arylamine hydrochloridesalts to their corresponding acetamides with trimethyl orthoacetate is described. Mechanistic studies using NMR and gas chromatography–mass spectrometry techniques indicate these reactions proceed via an O-methylimidate intermediate that undergoes in situ demethylation by chloride, affording
3-(2-Acylamino-1-Hydroxyethyl)-Morpholine Derivatives and Their Use as Bace Inhibitors
申请人:Broughton Barff Howard
公开号:US20070225267A1
公开(公告)日:2007-09-27
The present invention provides BACE inhibitors of Formula (I); methods for their use and preparation, and intermediates useful for their preparation.
本发明提供了化学式(I)的BACE抑制剂;以及它们的使用和制备方法,以及用于它们制备的中间体。
Mapping and Fitting the Peripheral Benzodiazepine Receptor Binding Site by Carboxamide Derivatives. Comparison of Different Approaches to Quantitative Ligand−Receptor Interaction Modeling
electrostatic contribution to the interaction (CoMFA, CoMSIA, and surface approaches) perform well, but they do not improve the quantitative models. Moreover, useful hints for the identification of the antagonist bindingsite in the three-dimensional modeling of the receptor (direct approach) were provided by the receptor hypothesis derived by the pharmacophoric approach. The ligand-receptor complexes
Thermoanalytical and X-ray study of some alkylammonium tetrachlorozincates
作者:Roger Blachnik、Christoph Siethoff
DOI:10.1016/0040-6031(95)02768-8
日期:1996.5
DSC and X-raystudies on mono-, di-, tri- and tetraalkylammonium tetrachlorozincates (alkyl is ethyl, propyl, n-butyl or sec-butyl) were performed in the range 173-500 K. Transition temperatures, enthalpies, entropies, and also lattice parameters of the compounds are given.
在 173-500 K 范围内对单、二、三和四烷基四氯锌酸铵(烷基是乙基、丙基、正丁基或仲丁基)进行了 DSC 和 X 射线研究。转变温度、焓、熵、并给出了化合物的晶格参数。