3867-18-3Relevant articles and documents
BN Polystyrenes: Emerging Optical Materials and Versatile Intermediates
Van De Wouw, Heidi L.,Klausen, Rebekka S.
, p. 1117 - 1125 (2019)
BN polystyrenes are an emerging class of polyolefins functionalized with aromatic side chains in which at least one CC bond is replaced with a BN bond. This class of structures exhibits unusual photophysical properties relative to organic polymers. BN pol
Synthesis of triphenylarsonium [11C]methylide, a new 11C-precursor. Application in the preparation of [2-11C]indole
Zessin,Steinbach,Johannsen
, p. 725 - 736 (1999)
The synthesis of the new and highly reactive 11C-precursor triphenylarsonium [11C]methylide 1 and its conversion into [2-11C]indole 6 is described. [11C]Methyltriphenylarsonium iodide 4 was prepared by quaterniz
In-situ facile synthesis novel N-doped thin graphene layer encapsulated Pd@N/C catalyst for semi-hydrogenation of alkynes
Liu, Jianguo,Lin, Shanshan,Sun, Jiangming,Ma, Longlong
, p. 553 - 560 (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).
Directing-group-assisted markovnikov-selective hydrothiolation of styrenes with thiols by photoredox/cobalt catalysis
Xiao, Qian,Zhang, Hong,Li, Jing-Hong,Jian, Jing-Xin,Tong, Qing-Xiao,Zhong, Jian-Ji
supporting information, p. 3604 - 3609 (2021/05/10)
In contrast with the well-developed radical thiol-ene reaction to access anti-Markovnikov-type products, the research on the catalytic Markovnikov-selective hydrothiolation of alkenes is very restricted. Because of the catalyst poisoning of metal catalysts by organosulfur compounds, limited examples of transition-metal-catalyzed thiol-ene reactions have been reported. However, in this work, a directing-group-assisted hydrothiolation of styrenes with thiols by photoredox/cobalt catalysis is found to proceed smoothly to afford Markovnikov-type sulfides with excellent regioselectivity.
Uncovering New Excited State Photochemical Reactivity by Altering the Course of the de Mayo Reaction
Kandappa, Sunil Kumar,Valloli, Lakshmy Kannadi,Jockusch, Steffen,Sivaguru, Jayaraman
supporting information, p. 3677 - 3681 (2021/04/07)
An unprecedented and previously unknown photochemical reactivity of 1,3-dicarbonyl compounds is observed with amino-alkenes leading to dihydropyrans. This novel photochemical reactivity changes the established paradigm related to the De Mayo reaction between 1,3-dicarbonyl compounds and alkenes. This new reaction allows convenient access to the Marmycin core in a single step from commercially available reactants. The origin and scope of this new photoreaction is detailed with preliminary photophysical and mechanistic investigations.