Palladium-catalyzed regioselective allylation of five-membered heteroarenes with allyltributylstannane
作者:Sheng Zhang、Xiaoqiang Yu、Xiujuan Feng、Yoshinori Yamamoto、Ming Bao
DOI:10.1039/c4cc10373d
日期:——
Palladium-catalyzedallylation reactions of 2-(chloromethyl)thiophenes, 2-(chloromethyl)furans, and N-protected 2-(chloromethyl)-1H-pyrroles with allyltributylstannane were described in this study. This type of allylation reaction regioselectively occurred on the heteroarene rings to produce allylated dearomatization products or allylated heteroarenes with satisfactory yields.
Pd-catalyzed allylative dearomatisation using Grignard reagents
作者:Cosimo Boldrini、Syuzanna R. Harutyunyan
DOI:10.1039/d1cc05609c
日期:——
naphthyl halides is shown to be feasible by employing Grignard reagents. The high reactivity of the nucleophile allows for fast reactions and low catalyst loading, while a plethora of successfully substituted compounds illustrate the broad scope. Five membered heteroaromatic compounds are also demonstrated to be reactive under similar conditions.
triplet 2-thienyl cation). Specific trapping by using oxygen along with computational analysis carried out by means of a density functional method support that, in the case of iodo derivatives, homolytic thienyl–I bond fragmentation occurs first and heteroaryl cations are formed by electron transfer within the triplet radical pair, thus opening an indirect access to such cations.
Silicone Composition and Organic Light-Emitting Diode
申请人:Suzuki Toshio
公开号:US20110017986A1
公开(公告)日:2011-01-27
A silicone composition comprising (A) a hydrolysis product prepared by reacting at least one thiophenyl-substituted silane and a cross-linking agent with water in the presence of an organic solvent to form an organic phase containing the hydrolysis product and an aqueous phase, and separating the organic phase from the aqueous phase, and (B) an organic solvent; and an organic light-emitting diode (OLED) containing a hole-transport/hole-injection layer comprising a cured polysiloxane prepared by applying the aforementioned silicone composition to form a film and curing the film.
allylation with simple alkenes to produce homo-allylic alcohols. This novel strategy directly uses easily available unactivated alkenes as alternative allyl sources instead of pre-synthesized allylic halides/alcohols, thus bypassing the need for exogeneous reductants. Mechanistic studies suggest that the unprecedented combination of allyl radical intermediates and CoI species to generate nucleophilic π-allylcobaltII
这项工作报告了第一个可见光介导的钴催化醛与简单烯烃的烯丙基化反应以生产均烯丙醇。这种新颖的策略直接使用容易获得的未活化烯烃作为替代烯丙基来源,而不是预先合成的烯丙基卤化物/醇,从而绕过了对外源还原剂的需求。机理研究表明,在光氧化还原条件下,烯丙基自由基中间体和 Co I物种的前所未有的组合产生亲核 π-烯丙基钴II代表了催化循环中的关键步骤。