Highly Efficient Copper‐Mediated Atom‐Transfer Radical Addition (ATRA) in the Presence of Reducing Agent
作者:William T. Eckenhoff、Sean T. Garrity、Tomislav Pintauer
DOI:10.1002/ejic.200701144
日期:2008.2
(TPMA)Br][Br] complexes in ATRA reactions of polybrominated compounds to alkenes in the presence of reducing agent (AIBN) was reported. [Cu II (TPMA)Br][Br], in conjunction with AIBN, effectively catalyzed ATRA reactions of CBr 4 and CHBr 3 to alkenes with concentrations between 5 and 100 ppm, which is the lowest number achieved in copper-mediated ATRA. The molecular structure of Cu I (TPMA)Br indicated that
Cu I (TPMA)Br [TPMA = tris(2-pyridylmethyl)amine] 和 [Cu II (TPMA)Br][Br] 配合物在多溴化合物与烯烃的 ATRA 反应中的合成、表征和特殊活性还原剂(AIBN)的报道。[Cu II (TPMA)Br][Br] 与 AIBN 结合,有效地催化 CBr 4 和 CHBr 3 生成烯烃的 ATRA 反应,浓度在 5 到 100 ppm 之间,这是在铜介导的 ATRA 中达到的最低值。Cu I (TPMA)Br 的分子结构表明,由于 TPMA [Cu I -N: 2.1024(15), 2.0753(15), 2.0709(15) 和 2.4397 (14) A] 和溴化物阴离子连接到铜 (I) 中心 [CU I -Br 2.5088(3) A]。变温 1 H NMR 和循环伏安法研究证实了 Cu I (TPMA)Br 和 [Cu
Photoinitiated ambient temperature copper-catalyzed atom transfer radical addition (ATRA) and cyclization (ATRC) reactions in the presence of free-radical diazo initiator (AIBN)
作者:Marielle Nicole C. Balili、Tomislav Pintauer
DOI:10.1039/c0dt01764g
日期:——
monoadduct was obtained in lower yields in the ATRA of less active halogenated compounds, which was mostly due to incomplete alkene conversions. Ambient temperature ATRA of CCl4 to various 1,6-dienes followed by sequential ATRC was also performed in the presence of UV light using [CuII(TPMA)Cl][Cl] complex and AIBN. High yields of the 5-exo-trig cyclic product were obtained for all dienes with preferential
Highly Efficient Ambient-Temperature Copper-Catalyzed Atom-Transfer Radical Addition (ATRA) in the Presence of Free-Radical Initiator (V-70) as a Reducing Agent
作者:Tomislav Pintauer、William T. Eckenhoff、Carolynne Ricardo、Marielle N. C. Balili、Ashley B. Biernesser、Sean J. Noonan、Matthew J. W. Taylor
DOI:10.1002/chem.200802048
日期:2009.1
Copper can do it! Highlyefficient ambient‐temperature copper‐catalyzed ATRA of polyhalogenated compounds to alkenes in the presence of free‐radicalinitiator 2,2′‐azobis(4‐methoxy‐2,4‐dimethyl valeronitrile) (V‐70) is reported. V‐70 has been shown to be a very effective reducingagent, enabling selective formation of the ATRA product with α‐olefins and highly active monomers, such as methyl acrylate
using the complexes generated in situ from a mixture of common copper(II) halides and the ligand. The photoelectrochemical properties of the copper(II)-quinoline complexes suggest their effective reduction by light-induced homolysis to form the corresponding active copper(I) species without the necessity of an external reducing agent. Excellent yields of regio- and stereoselective addition products (>20
合成了喹啉基配体的铜( II )配合物,并研究了它们在卤代烃与烯烃的原子转移自由基加成(ATRA)反应中的催化性能。在室温下的白光照射下,配合物有效地催化加成反应并抑制烯烃的自由基聚合。通过使用由普通卤化铜( II )和配体的混合物原位产生的配合物,可以方便地进行反应。铜( II )-喹啉配合物的光电化学性质表明它们通过光致均裂有效还原形成相应的活性铜( I) 不需要外部还原剂的物种。通过使用 1 mol% 或更少的催化剂,可以获得优异的区域和立体选择性加成产物(>20 个实例)。评估了常用添加剂 AIBN 和 Na 2 CO 3的作用,表明这些添加剂通过防止反应过程中 HX 的积累来减轻催化剂中毒。
Kharasch; Jensen; Urry, Journal of the American Chemical Society, 1947, vol. 69, p. 1104