The X-ray crystal structure analysis of the chloroform adduct of the bis(tripheny1phosphine) platinum di-oxygen complex (PPh3)2Pt02.2CHC13 is reported. The crystals belong to the monoclinic system a = 15.492(7), b = 13.520(5), c = 19.187(6) A; P = 98.97(6)". Space group C2/c. Z = 4 molecules per cell.A total of 2740 independent X-ray reflections were measured and refinement gave a final conventional R of 6.6%.The molecule has a two-fold axis of svmmetrv through the Pt atom with 0-0 normal to the axis. The 0-0 distance of 1.505 (16) is ii accord with that found with other transition elements when oxygen is taken up irreversibly to form di-oxygen complexes.On a determine par diffraction de rayons-x la structure cristalline du compose d'addition du chloroforme et du dioxo bis(triphCny1ephosphine) platine (PPh3),PtO2.2CHCl3. Ce compose cristallise avec une maille monoclinique de dimensions: a = 15.492 (7), b = 13.520 (5), c = 19.187 (6)
Rh(III)-catalyzed regioselective alkylation of indoles with diazo compounds as a highly efficient and atom-economic protocol for the synthesis of alkyl substituted indoles has been developed. The reaction could proceed under mild conditions and afford a series of desired products in good to excellent yields.
Diazo compounds had been widely employed as a class of environment friendly and highly efficient coupling reagents in transition-metal-catalyzed C-H bonds insertion reactions. Recently, C-H alkylation of various arenes and heteroarenes has been achieved enormous successes using diazo compounds as the alkylation reagents under a new catalytic model. The recent progress in diazo compounds mediated transition-metal-catalyzed C-H alkylation and tandem C-H alkylation/cyclization is reviewed, including reaction mechanism and synthetic applications. Furthermore, the prospects of this reaction are also discussed.
Oxacalix[4]arene-bridged pillar[5]arene dimers comprising a pair of enantiomers and a meso isomer were synthesized. Chiral [2]rotaxanes and [3]rotaxanes were constructed.
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