Use of functionalized onium salts as a soluble support for organic synthesis
申请人:Vaultier Michel
公开号:US20070043234A1
公开(公告)日:2007-02-22
The invention relates to the use of a onium salt functionalized by at least one organic function, as a soluble support, in the presence of at least one organic solvent, for organic synthesis of a molecule, in a homogenous phase, by at least one transformation of said organic function. The onium salt enables the synthesized molecule to be released. The onium salt is present in liquid or solid form at room temperature and corresponds to formula A
1
+
, X
1
−
, wherein A
1
+
represents a cation and X
1
−
represents an anion.
Regio- and Stereoselective Route to Tetrasubstituted Olefins by the Palladium-Catalyzed Three-Component Coupling of Aryl Iodides, Internal Alkynes, and Arylboronic Acids
作者:Chengxiang Zhou、Richard C. Larock
DOI:10.1021/jo048265+
日期:2005.5.1
The Pd-catalyzed three-component coupling of readily available aryl iodides, internalalkynes, and arylboronic acids provides a convenient, one-step, regio- and stereoselective route to tetrasubstitutedolefins in good to excellent yields, although electron-poor aryl iodides and dialkylalkynes normally afford only low yields under our standard reaction conditions. The proper combination of substrates
transitions. Meanwhile, the emission of these compounds in solution at room temperature (λ em = 458 ~ 509 nm) can be attributed to the 1π,π*/1ICT state. Introduction of freely rotatable TPE to conventional β-diketone luminophors quenches their light emissions in the solutions, but endows these molecules with aggregation-induced emission (AIE) characteristics in the condensed phase due to the restriction
合成并表征了一系列带有四亚苯基(TPE)部分的β-二酮衍生物。通过光谱学和理论方法对它们的光物理性质进行了系统的研究。所有化合物显示出300和450nm之间的宽吸收带,其被分配给1 π-π*的共轭体系的分子内混合电荷转移的过渡(ICT)过渡。同时,这些化合物在室温下溶液(发射λ EM = 458〜509纳米)可以归因于在1个π,π* / 1 ICT状态。将可自由旋转的TPE引入常规β-二酮发光体在溶液中淬灭了它们的光发射,但是由于分子内旋转的限制,使这些分子在凝聚相中具有聚集诱导发射(AIE)特性。光谱研究和理论计算表明,这些β的光物理性质-二酮衍生物可以通过附加的取代基进行调节,这对于合理设计具有高固态发光性能的AIE化合物将很有用。此外,这些AIE活性化合物表现出独特的压电氟致变色特性,并且在磨碎发烟后可逆地转换。已经研究了它们的光物理性质,目的是为阐明结构性质相关性和开发新的多刺激响应性发光材料提供基础。
The inherent mechanism of mechanochromism under different stress: electron cloud density distribution, J-type stacking, pore structure and collapse of J-type stacking