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.
A Combined Mössbauer, Magnetic Circular Dichroism, and Density Functional Theory Approach for Iron Cross-Coupling Catalysis: Electronic Structure, In Situ Formation, and Reactivity of Iron-Mesityl-Bisphosphines
作者:Stephanie L. Daifuku、Malik H. Al-Afyouni、Benjamin E. R. Snyder、Jared L. Kneebone、Michael L. Neidig
DOI:10.1021/ja503596m
日期:2014.6.25
effective catalysts for C-C cross-coupling, the nature of the in situ formed iron species, elucidation of the active catalysts and the mechanisms of catalysis have remained elusive. A combination of (57)Fe Mössbauer and magneticcirculardichroism (MCD) spectroscopies of well-defined and in situ formed mesityl-iron(II)-SciOPP species combined with densityfunctionaltheory (DFT) investigations provides
Catalyst for cross-coupling reaction comprising unsubstituted or substituted bisphosphinobenzenes
申请人:Nakamura Masaharu
公开号:US08637710B2
公开(公告)日:2014-01-28
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.
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.