768-56-9Relevant articles and documents
Paramagnetische 17-Elektronen-+-Komplexe; Synthese, Struktur und katalysche Anwendung
Sernau, Volker,Huttner, Gottfried,Fritz, Martin,Zsolnai, Laszlo,Walter, Olaf
, p. C23 - C29 (1993)
The paramagnetic 17-electron η3-allylic complexes 3-Allyl)>+ (Tripod = CH3C(CH2PPh2)3; Allyl = C3H5, 2a; CH2C(CH3)CH2, 2b; (CH3)CHCHCH2, 2c) have been obtained from (Tripod)Co(η2-O2CCH3)+, 1, as crystalline BPh4-salts.The compounds have been characterized by X-ray analyses as well as by usual techniques including ESR.Compounds 2 have been found to act as effective catalysts for allylic alkylations.As an example the catalytic formation of 4-phenylbutene-1 is given.
In-situ facile synthesis novel N-doped thin graphene layer encapsulated Pd@N/C catalyst for semi-hydrogenation of alkynes
Lin, Shanshan,Liu, Jianguo,Ma, Longlong,Sun, Jiangming
, (2021/12/03)
Transition metal-catalyzed semi-hydrogenation of alkynes has become one of the most popular methods for alkene synthesis. Specifically, the noble metal Pd, Rh, and Ru-based heterogeneous catalysts have been widely studied and utilized in both academia and industry. But the supported noble metal catalysts are generally suffering from leaching or aggregation during harsh reaction conditions, which resulting low catalytic reactivity and stability. Herein, we reported the facile synthesis of nitrogen doped graphene encapsulated Pd catalyst and its application in the chemo-selective semi-hydrogenation of alkynes. The graphene layer served as “bulletproof” over the active Pd Nano metal species, which was confirmed by X-ray and TEM analysis, enhanced the catalytic stability during the reaction conditions. The optimized prepared Pd@N/C catalyst showed excellent efficiency in semi-hydrogenation of phenylacetylene and other types of alkynes with un-functionalized or functionalized substituents, including the hydrogenation sensitive functional groups (NO2, ester, and halogen).
Ni-Catalyzed Carboxylation of Aziridines en Route to β-Amino Acids
Davies, Jacob,Janssen-Müller, Daniel,Zimin, Dmitry P.,Day, Craig S.,Yanagi, Tomoyuki,Elfert, Jonas,Martin, Ruben
supporting information, p. 4949 - 4954 (2021/04/07)
A Ni-catalyzed reductive carboxylation of N-substituted aziridines with CO2 at atmospheric pressure is disclosed. The protocol is characterized by its mild conditions, experimental ease, and exquisite chemo- and regioselectivity pattern, thus unlocking a new catalytic blueprint to access β-amino acids, important building blocks with considerable potential as peptidomimetics.
Exploiting the radical reactivity of diazaphosphinanes in hydrodehalogenations and cascade cyclizations
Cheng, Jin-Pei,Yang, Jin-Dong,Zhang, Jingjing
, p. 4786 - 4790 (2020/06/18)
The remarkable reducibility of diazaphosphinanes has been extensively applied in various hydrogenations, based on and yet limited by their well-known hydridic reactivity. Here we exploited their unprecedented radical reactivity to implement hydrodehalogenations and cascade cyclizations originally inaccessible by hydride transfer. These reactions feature a broad substrate scope, high efficiency and simplicity of manipulation. Mechanistic studies suggested a radical chain process in which a phosphinyl radical is generated in a catalytic cycle via hydrogen-atom transfer from diazaphosphinanes. The radical reactivity of diazaphosphinanes disclosed here differs from their well-established hydridic reactivity, and hence, opens a new avenue for diazaphosphinane applications in organic syntheses.