Synthesis of 2-Alkynoates by Palladium(II)-Catalyzed Oxidative Carbonylation of Terminal Alkynes and Alcohols
作者:Qun Cao、N. Louise Hughes、Mark J. Muldoon
DOI:10.1002/chem.201602558
日期:2016.8.16
PdII catalyst, utilizing a simple and inexpensive amine ligand (TMEDA), allows 2‐alkynoates to be prepared in high yields by an oxidativecarbonylation of terminal alkynes and alcohols. The catalyst system overcomes many of the limitations of previous palladiumcarbonylation catalysts. It has an increased substrate scope, avoids large excesses of alcohol substrate and uses a desirable solvent. The catalyst
found to be excellent ligands with Pd(OAc)2 in the palladium-catalyzed air (balloon) oxidation of alcohols in toluene at 80 degrees C. Comparison with structurallyrelatedpyridine ligands revealed that introduction of the 2,3,4,5-tetraphenylphenyl substituent at the 3-position of pyridine ring effectively suppresses the Pd black formation, maintaining the catalytic activity for a long time to give aldehydes
new bipyridyl– and pyridylquinolyl–phenothiazine structures were synthesized through Pd-catalyzed C–N couplings between phenothiazine and the corresponding bromo-heteroaryls. For the 2-(N-phenothiazine)-bipyridine, boat conformation was determined for the phenothiazine moiety by X-ray diffraction analysis. Single well-defined palladium acetate complexes were observed by 1H NMR analysis with the 4-(N
通过吩噻嗪与相应的溴-杂芳基之间的钯催化C-N偶联,合成了三个新的联吡啶基和吡啶基喹啉基-吩噻嗪结构。对于2-(N-吩噻嗪)-联吡啶,通过X射线衍射分析确定吩噻嗪部分的舟状构象。通过4-(N-吩噻嗪)-联吡啶和吡啶基-5-(N-吩噻嗪)-喹啉的1 H NMR分析观察到单一的明确定义的乙酸钯络合物。与裸配体相比,在这些情况下,UV-可见吸收光谱显示,配位时λmax发生了明显的红移。自由和协调的4-(N-吩噻嗪)-联吡啶表明发生了从吩噻嗪到联吡啶的电子转移。这种联吡啶基-吩噻嗪结构有可能在近紫外线照射下调节配位基团的电子密度,这可能是一类用于有机金属催化的新型光敏配体的起源。
New π-extended catecholato complexes of Pt(<scp>ii</scp>) and Pd(<scp>ii</scp>) containing a benzothienobenzothiophene (BTBT) moiety: synthesis, electrochemical behavior and charge transfer properties
synthesis of metal complexes involving a BTBT moiety, which was achieved by complexation of 2,2′-bipyridyl complexes of Pt(II) and Pd(II) with dihydroxy-substituted BTBT (1) as a new π-extended catecholato ligand (tBu2Bpy = 4,4′-di-tert-butyl-2,2′-dipyridyl). The resulting complexes M(tBu2Bpy)(O2BTBT) (M = Pt (3Pt) and Pd (3Pd)) were characterized by UV–vis spectroscopy, density functional theory (DFT) calculations
苯并噻吩并苯并噻吩(BTBT)及其衍生物作为有机场效应晶体管材料和分子导体受到越来越多的关注。该报告介绍了涉及BTBT部分的金属配合物的首次合成,该合成是通过将Pt(II)和Pd(II)的2,2'-联吡啶配合物与作为新的π-的二羟基取代的BTBT(1)配合而实现的。扩展的儿茶酚配体(t Bu 2 Bpy = 4,4'-二叔丁基-2,2'-二吡啶基)。将得到的配合物M(吨卜2 BPY)(O 2 BTBT)(M =的Pt(3点)和Pd(3PD))通过紫外可见光谱,密度泛函理论(DFT)计算和循环伏安法进行表征。在包含两个氧取代基并随后进行金属配位后,BTBT的给电子能力大大增强。这使的化学氧化3点和3PD与单电子氧化状态的温和的化学氧化剂(二茂铁鎓六氟磷酸盐)和形成。虽然3点和第三方开发表现出源自邻苯二酚→Bpy配体到配体的电荷转移跃迁的吸收带,是此类儿茶酚络合物的典型特征,自由基阳离子表现出独特的π–π
Synthesis, Structure, and Reactivity of the Novel Pentacoordinate Palladium Complex [Pd(Phen)<sub>2</sub>(CO<sub>2</sub>CH<sub>3</sub>)](PF<sub>6</sub>)
作者:Rossella Garrone、Anna Maria Romano、Roberto Santi、Roberto Millini
DOI:10.1021/om980315b
日期:1998.9.1
Reaction of [Pd(phen)(CO2CH3)2] (1) with phenanthrolinium hexafluorophosphate (2) gives in high yield the unprecedented pentacoordinate palladium complex [Pd(phen)2(COOMe)](PF6) (3) in which Pd displays a strongly distorted square pyramidal coordination. The reactivity of 3 toward bases was explored too.