start-ver=1.4 cd-journal=joma no-vol=696 cd-vols= no-issue=1 article-no= start-page=348 end-page=351 dt-received= dt-revised= dt-accepted= dt-pub-year=2011 dt-pub=20110101 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Rhenium-catalyzed insertion of terminal alkenes into a C(sp(2))?H bond and successive transfer hydrogenation en-subtitle= kn-subtitle= en-abstract= kn-abstract=Treatment of aromatic aldimines with terminal alkenes in the presence of a rhenium catalyst, [HRe(CO)(4)](n), gives 2-alkenylbenzylamines in good to excellent yields. This reaction proceeds via the insertion of the alkene into a C-H bond at the ortho-position of the imino group of the aromatic aldimine followed by sequential beta-hydride elimination from the formed alkyl rhenium intermediate and then by hydrogenation of the imino group of the aldimine. en-copyright= kn-copyright= en-aut-name=KuninobuYoichiro en-aut-sei=Kuninobu en-aut-mei=Yoichiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=NakaharaTakahiro en-aut-sei=Nakahara en-aut-mei=Takahiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=YuPeng en-aut-sei=Yu en-aut-mei=Peng kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=TakaiKazuhiko en-aut-sei=Takai en-aut-mei=Kazuhiko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Division of Chemistry and Biochemistry, Graduate School of Natural Science and Technology, Okayama University affil-num=2 en-affil= kn-affil=Division of Chemistry and Biochemistry, Graduate School of Natural Science and Technology, Okayama University affil-num=3 en-affil= kn-affil=Division of Chemistry and Biochemistry, Graduate School of Natural Science and Technology, Okayama University affil-num=4 en-affil= kn-affil=Division of Chemistry and Biochemistry, Graduate School of Natural Science and Technology, Okayama University en-keyword=Rhenium kn-keyword=Rhenium en-keyword=Insertion kn-keyword=Insertion en-keyword=Hydrogen transfer kn-keyword=Hydrogen transfer en-keyword=Aldimine kn-keyword=Aldimine en-keyword=Alkene kn-keyword=Alkene END start-ver=1.4 cd-journal=joma no-vol=104 cd-vols= no-issue=1-2 article-no= start-page=9 end-page=18 dt-received= dt-revised= dt-accepted= dt-pub-year=2011 dt-pub=2011 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Structure of the catalytic, inorganic core of oxygen-evolving photosystem II at 1.9 ? resolution en-subtitle= kn-subtitle= en-abstract= kn-abstract=The catalytic center for photosynthetic water-splitting consists of 4 Mn atoms and 1 Ca atom and is located near the lumenal surface of photosystem II. So far the structure of the Mn(4)Ca-cluster has been studied by a variety of techniques including X-ray spectroscopy and diffraction, and various structural models have been proposed. However, its exact structure is still unknown due to the limited resolution of crystal structures of PSII achieved so far, as well as possible radiation damages that might have occurred. Very recently, we have succeeded in solving the structure of photosystem II at 1.9 angstrom. which yielded a detailed picture of the Mn(4)CaO(5)-cluster for the first time. In the high resolution structure, the Mn(4)CaO(5)-cluster is arranged in a distorted chair form, with a cubane-like structure formed by 3 Mn and 1 Ca, 4 oxygen atoms as the distorted base of the chair, and 1 Mn and 1 oxygen atom outside of the cubane as the back of the chair. In addition, four water molecules were associated with the cluster, among which, two are associated with the terminal Mn atom and two are associated with the Ca atom. Some of these water molecules may therefore serve as the substrates for water-splitting. The high resolution structure of the catalytic center provided a solid basis for elucidation of the mechanism of photosynthetic water splitting. We review here the structural features of the Mn(4)CaO(5)-cluster analyzed at 1.9 angstrom resolution, and compare them with the structures reported previously. en-copyright= kn-copyright= en-aut-name=KawakamiKeisuke en-aut-sei=Kawakami en-aut-mei=Keisuke kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=UmenaYasufumi en-aut-sei=Umena en-aut-mei=Yasufumi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=KamiyaNobuo en-aut-sei=Kamiya en-aut-mei=Nobuo kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=ShenJian-Ren en-aut-sei=Shen en-aut-mei=Jian-Ren kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Department of Chemistry, Graduate School of Science, and The OCU Advanced Research Institute for Natural Science and Technology (OCARINA), Osaka City University affil-num=2 en-affil= kn-affil=Department of Chemistry, Graduate School of Science, and The OCU Advanced Research Institute for Natural Science and Technology (OCARINA), Osaka City University affil-num=3 en-affil= kn-affil=Department of Chemistry, Graduate School of Science, and The OCU Advanced Research Institute for Natural Science and Technology (OCARINA), Osaka City University affil-num=4 en-affil= kn-affil=Division of Bioscience, Graduate School of Natural Science and Technology/Faculty of Science, Okayama University en-keyword=Crystal structure kn-keyword=Crystal structure en-keyword=Membrane protein structure kn-keyword=Membrane protein structure en-keyword=Oxygen-evolving complex kn-keyword=Oxygen-evolving complex en-keyword=Photosystem II kn-keyword=Photosystem II en-keyword=Water-oxidation kn-keyword=Water-oxidation END