Ni-Catalyzed Site-Selective Dicarboxylation of 1,3-Dienes with CO<sub>2</sub>
作者:Andreu Tortajada、Ryo Ninokata、Ruben Martin
DOI:10.1021/jacs.7b13220
日期:2018.2.14
A site-selective catalytic incorporation of multiple CO2 molecules into 1,3-dienes en route to adipic acids is described. This protocol is characterized by its mildconditions, excellent chemo- and regioselectivity and ease of execution under CO2 (1 atm), including the use of bulk butadiene and/or isoprene feedstocks.
描述了一种位点选择性催化将多个 CO2 分子结合到 1,3-二烯到己二酸的过程中。该协议的特点是条件温和,具有出色的化学和区域选择性,并且在 CO2 (1 atm) 下易于执行,包括使用散装丁二烯和/或异戊二烯原料。
Lithium hydroxide as base in the Wittig reaction. A simple method for olefin synthesis
A mild and practical procedure for the Wittig olefination, promoted by lithium hydroxide and triphenylbenzyl phosphonium bromide, has been set up for the synthesis of stilbenes and styrenes. The experimental conditions allow aromatic, heteroaromatic, unsaturated and saturated aliphatic aldehydes to give final products in good yields.
Preparation and reactivity of dinuclear RuII complexes with bridging thiolate ligands [Cp★Ru(μ-SR)2RuCp★] (Cp★ η5-C5Me5; R iPr, tBu, 2,6-Me2C6H3).Oxidative addition of alkyl halides at the diruthenium center
fluxional nature of complexes3 in solution resulting from the Ru2S2 ring inversion. Complex 3a (R iPr) underwent oxidative addition of RX (R PhCH2CH2 or PhCH2, X Br; R Me or Et, X I) and H2 across the Ru2 center to give [Cp★RuR(μ-SiPr)2RuCp★X] (7) and [Cp★RuH(μ-SiPr)2RuCp★H], respectively. The structure of 7a (R PhCH2CH2, X Br) has been determined by X-ray crystallography. Crystal data for 3c:
的[Cp★的RuCl]的反应4(CP★η 5 -C 5我5)与纳斯尔(R我PR,吨卜,2,6--ME 2 ç 6 ħ 3)在THF双核,得到钌II络合物与两个桥接硫醇盐配体[Cp★Ru(μ-SR)2 RuCp★](3)。X射线分析3c(R = 2,6-Me 2 C 6 H 3)揭示了具有两个赤道C 6 H 3 Me 2的折叠Ru 2 S 2芯结构。固态有-2,6个基团,而1 H NMR可变温度研究的结果可诊断因Ru 2 S 2环反转而形成的络合物3在溶液中的通量性质。复杂的图3a(R我PR)后行氧化加成RX的(R的PhCH 2 CH 2或物理信道2,X溴; RMe或Et,XI)和H 2穿过的Ru 2中心,得到的[Cp ★RUR(μ-S我PR)2 RuCp★X](7)和的[Cp★期RuH(μ-S我PR)2 RuCp★H],分别。的结构图7a(R的PhCH 2 CH 2,X溴