Réactifs de Polyvinylogation : accès aisé et rapide à des Polyénals variés.
摘要:
This work describes the synthesis and the reactivity of three reagents of polyvinylogation 1-3 By condensation with several aldehydes and ketones, these reagents allow the introduction of three or four doubles bonds, leading to polyenals 5-6 in one or two steps with good yields, A thorough study by high field NMR spectroscopy has been realised ; these polyenals show an all trans configuration.
Functionalized vinylic organolithium compounds, synthetic equivalent of ω-lithio sorbaldehyde
作者:L. Duhamel、G. Ple、Y. Ramondenc
DOI:10.1016/s0040-4039(00)70701-5
日期:1989.1
Functional vinylic anions and react with aldehydes and ketones leading after hydrolysis to polyenic aldehydes . They have been used for the synthesis of navenone B .
官能乙烯基阴离子和与醛和酮水解为多烯醛之后导致反应。它们已用于合成navenoneB 。
Réactifs de Polyvinylogation : accès aisé et rapide à des Polyénals variés.
作者:Y. Ramondenc、G. Ple
DOI:10.1016/s0040-4020(01)80239-8
日期:1993.1
This work describes the synthesis and the reactivity of three reagents of polyvinylogation 1-3 By condensation with several aldehydes and ketones, these reagents allow the introduction of three or four doubles bonds, leading to polyenals 5-6 in one or two steps with good yields, A thorough study by high field NMR spectroscopy has been realised ; these polyenals show an all trans configuration.
Syntheses and Spectroscopic and Quadratic Nonlinear Optical Properties of Extended Dipolar Complexes with Ruthenium(II) Ammine Electron Donor and <i>N</i>-Methylpyridinium Acceptor Groups
作者:Benjamin J. Coe、Lathe A. Jones、James A. Harris、Bruce S. Brunschwig、Inge Asselberghs、Koen Clays、André Persoons、Javier Garín、Jesús Orduna
DOI:10.1021/ja0315412
日期:2004.3.1
In this paper, we describe the extremely unusual opticalproperties of Ru(II)-based electron donor-acceptor (D-A) polyene and some closely related chromophores. For three different polyene series, the intense, visible d-->pi* metal-to-ligand charge-transfer bands unexpectedly blue-shift as the number of E-ethylene units (n) increases from 1 to 3, and the static first hyperpolarizabilities beta(0) determined
在本文中,我们描述了基于 Ru(II) 的电子供体-受体 (DA) 多烯和一些密切相关的发色团的极其不寻常的光学性质。对于三种不同的多烯系列,随着 E-乙烯单元 (n) 的数量从 1 增加到 3,强烈的、可见的 d-->pi* 金属-配体电荷转移带出人意料地蓝移,并且静电首先通过超瑞利散射和斯塔克光谱确定的超极化率 beta(0) 在 n = 2 时最大化,与其他已知的 DA 多烯形成鲜明对比,其中 beta(0) 随 n 稳定增加。瞬态密度泛函理论和有限场计算验证了这些经验趋势,这些趋势源于复合物的轨道结构。