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      The Palladium-Catalyzed Intermolecular C–H Chalcogenation of Arenes

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          A short history of SHELX

          An account is given of the development of the SHELX system of computer programs from SHELX -76 to the present day. In addition to identifying useful innovations that have come into general use through their implementation in SHELX , a critical analysis is presented of the less-successful features, missed opportunities and desirable improvements for future releases of the software. An attempt is made to understand how a program originally designed for photographic intensity data, punched cards and computers over 10000 times slower than an average modern personal computer has managed to survive for so long. SHELXL is the most widely used program for small-molecule refinement and SHELXS and SHELXD are often employed for structure solution despite the availability of objectively superior programs. SHELXL also finds a niche for the refinement of macromolecules against high-resolution or twinned data; SHELXPRO acts as an interface for macromolecular applications. SHELXC , SHELXD and SHELXE are proving useful for the experimental phasing of macromolecules, especially because they are fast and robust and so are often employed in pipelines for high-throughput phasing. This paper could serve as a general literature citation when one or more of the open-source SHELX programs (and the Bruker AXS version SHELXTL ) are employed in the course of a crystal-structure determination.
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            Palladium(II)-catalyzed C-H activation/C-C cross-coupling reactions: versatility and practicality.

            In the past decade, palladium-catalyzed C-H activation/C-C bond-forming reactions have emerged as promising new catalytic transformations; however, development in this field is still at an early stage compared to the state of the art in cross-coupling reactions using aryl and alkyl halides. This Review begins with a brief introduction of four extensively investigated modes of catalysis for forming C-C bonds from C-H bonds: Pd(II)/Pd(0), Pd(II)/Pd(IV), Pd(0)/Pd(II)/Pd(IV), and Pd(0)/Pd(II) catalysis. A more detailed discussion is then directed towards the recent development of palladium(II)-catalyzed coupling of C-H bonds with organometallic reagents through a Pd(II)/Pd(0) catalytic cycle. Despite the progress made to date, improving the versatility and practicality of this new reaction remains a tremendous challenge.
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              Carboxylate-assisted transition-metal-catalyzed C-H bond functionalizations: mechanism and scope.

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                Author and article information

                Journal
                The Journal of Organic Chemistry
                J. Org. Chem.
                American Chemical Society (ACS)
                0022-3263
                1520-6904
                January 02 2015
                December 10 2014
                January 02 2015
                : 80
                : 1
                : 367-374
                Affiliations
                [1 ]Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
                [2 ]College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, P. R. China
                Article
                10.1021/jo502402d
                25437148
                f52047be-6323-4db3-bb28-baaa09c25dcc
                © 2015
                History

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