Thermal Rearrangement of Sulfamoyl Azides: Reactivity and Mechanistic Study
作者:Xiaodong Zou、Jiaqi Zou、Lizheng Yang、Guigen Li、Hongjian Lu
DOI:10.1021/acs.joc.7b00308
日期:2017.5.5
The rearrangement of sulfamoyl azides under thermal conditions to form a C–C bond while breaking two C–N bonds is reported. Mechanisticstudy shows that this reaction goes through a Curtius-type rearrangement to form a 1,1-diazene, then which rearranges possibly through both a concerted rearrangement process and a stepwise radical process. This rearrangement could be used in the synthesis of complex
CATALYST FOR CROSS-COUPLING REACTION, AND PROCESS FOR PRODUCTION OF AROMATIC COMPOUND USING THE SAME
申请人:Nakamura Masaharu
公开号:US20110152523A1
公开(公告)日:2011-06-23
The present invention provides a process for efficiently producing an alkylated aromatic compound in good yield, by a cross-coupling reaction between an alkyl halide and an aromatic magnesium reagent. A process for producing an aromatic compound represented by Formula (1):
R—Ar′ (1)
wherein R is a hydrocarbon group, and Ar′ is an aryl group;
the process comprising:
reacting a compound represented by Formula (2):
R—X (2)
wherein X is a halogen atom, and R is as defined above, with a magnesium reagent represented by Formula (3):
Ar′—MgY (3)
wherein Y is a halogen atom, and Ar′ is as defined above, in the presence of a catalyst for cross-coupling reactions comprising an iron compound and a bisphosphine compound represented by Formula (4):
wherein Q is a divalent group derived from an aromatic ring by removing two hydrogen (H) atoms on adjacent carbon atoms; and each Ar is independently an aryl group.
ABSTRACT A rapid and highly efficient method for the radical formation using potassium alkylfluoroborates as radical precursor is devised and developed which conducts under relatively mild condition using silver(I) oxide as the oxidant. The observed silver mirror phenomenon hints at the fact that Ag2O is the real oxidant. This approach effectively overcomes the drawbacks-stringent reaction conditions
The synergy between the CsPbBr<sub>3</sub> nanoparticle surface and the organic ligand becomes manifest in a demanding carbon–carbon coupling reaction
作者:Ignacio Rosa-Pardo、Carla Casadevall、Luciana Schmidt、Miguel Claros、Raquel E. Galian、Julio Lloret-Fillol、Julia Pérez-Prieto
DOI:10.1039/d0cc01339k
日期:——
We demonstrate here the suitability of CsPbBr3 nanoparticles as photosensitizers for a demanding photoredox catalytic homo- and cross-coupling of alkyl bromides at room temperature by merely using visible light and an electron donor, thanks to the cooperative action between the nanoparticle surface and organic capping.
An iron(II) chloride complex possessing a sterically demanding ortho-phenylene-tethered bisphosphine ligand shows a high catalytic activity in the Kumada–Tamao–Corriu coupling of nonactivated alkyl halides with aryl Grignard reagents. Primary, secondary, and tertiary alkyl halides can participate as an electrophilic coupling partner. A radical clock experiment using (iodomethyl)cyclopropane exclusively gives the corresponding ring-opening coupling product, suggesting intermediacy of alkyl radical species.