Ruthenium(IV) complexes were identified as key intermediates of C−H/O−H activations by weak O‐coordination. Thus, the annulations of sulfoxonium ylides by benzoic acids provided expedient access to diversely‐decorated isocoumarins with ample scope. Detailed experimental and computational studies provided strong support for a facile BIES‐C−Hactivation, along with cyclometalated ruthenium(IV) intermediates
group assisted C–H activation with maleimides leading to novel and switchable decarboxylative Heck-type and [4 + 1] annulation products catalyzed by Rh(III) has been reported. In these reactions, solvents play a vital role in switching the selectivity. An aprotic solvent, THF, leads to the decarboxylative Heck-type product while the protic solvent, TFE, results in the [4 + 1] annulation product. The
Aerobic oxidative CH functionalizations of weakly coordinating benzoic acids have been accomplished with versatile ruthenium(II) biscarboxylates under ambient oxygen or air. Mechanistic studies identified the key factors controlling the elementary step of the oxidation of the ruthenium(0) complex.
Preparation of Naphthalene-2,3,6,7-tetracarboxylic Acid
作者:Koji Chiba、Hideyuki Tagaya、Hiroshi Kono
DOI:10.1246/cl.1988.1933
日期:1988.11.5
In the presence of sodium iodide and cadmium oxide, sodium 1-naphthoate was effectively converted into naphthalene-2,3,6,7-tetracarboxylate at 480 °C under carbon dioxide pressure. The minor product was naphthalene-2,6-dicarboxylate. Also in the rearrangement of sodium 2-naphthoate, the addition effect of sodium iodide was observed.
Synthesis and molecular structure of the five-coordinate zirconium complex (CH3C5H4)2ZrCl(α-C10H7COO)
作者:Zhi-Qiang Wang、Shi-Wei Lu、He-Fu Guo、Ning-Hai Hu、Yong-Sheng Liu
DOI:10.1016/s0277-5387(00)86159-8
日期:1991.1
Bis(methylcyclopentadienyl)chloro(α-naphthoyloxy)zirconium, (CH3C5H4)2Zr Cl(α-C10H7COO), has been synthesized by the reaction between (MeCp)2ZrCL2 and equimolar sodium α-naphthoate in toluene at room temperature. The molecular structure of the title complex was determined by X-ray diffraction. The molecules have a five-Coordinatebentmetallocenestructure in which the α-naphthoxyligand is bidentate