The synthesis and X-ray crystal structure of 5'-methoxy-2,4,6-trimethyl-2'-nitrosobiphenyl is reported. The compound (C16H17NO2) is monoclinic, with a = 11.080(4), b = 16.899(6), c = 15.410(5) Angstrom, beta = 108.329(5)degrees, and space group P2(1)/n. There are two independent molecules within the crystal. In each of these molecules the two phenyl rings are mutually orthogonal, with interplanar dihedral angles of 85.09 and 89.43degrees respectively. The nitroso substituents are essentially coplanar with the phenyl ring, with torsional angles of only 3.5 and 2.2degrees, respectively, while the methoxy groups make angles of 5.2 and 10.0degrees, respectively, with the phenyl ring.
A method for producing an unsaturated organic compound represented by the formula (3):
(Y
1
)
m-1
—R
1
—R
2
—(Y
2
)
n-1
(3)
wherein Y
1
represents R
2
or X
1
, and Y
2
represents R
1
or B(X
2
)
2
, which comprises reacting a compound represented by the formula (1):
R
1
(X
1
)
m
(1)
wherein R
1
represents an aromatic group or the like, X
1
represents a leaving group and m represents 1 or 2, with a compound represented by the formula (2):
R
2
B(X
2
)
2
}
n
(2)
wherein R
2
represents an aromatic group or the like, X
2
represents a hydroxyl group or the like, and n represents 1 or 2,
in the presence of
(a) a nickel compound selected from a nickel carboxylate, nickel nitrate and a nickel halide,
(b) a phosphine compound such as 1,4-bis(dicyclohexylphosphino) butane,
(c) an amine selected from a primary amine and a diamine such as N,N,N′,N′-tetramethyl-1,2-ethanediamine, and
(d) an inorganic base.
The photolysis of electron-rich aryl nonaflates (ArONfs) in protic media was investigated and heterolysis of the ArâOS bond (from 3ArONf) took place. The reaction generated a triplet phenyl cation that added to Ï-bond nucleophiles. This metal-free arylation method was made further useful by adopting in situ preparation of ArONf from the corresponding phenol.
Highly active, air-stable palladium catalysts for Kumada–Tamao–Corriu cross-coupling reaction of inactivated aryl chlorides with aryl Grignard reagents
作者:George Y Li
DOI:10.1016/s0022-328x(02)01259-7
日期:2002.7
Palladium(II) chlorides possessing phosphinous acid ligands have proved to be remarkably active and efficient catalysts for cross-couplingreactions of inactivated arylchlorides with arylGrignardreagents (Kumada–Tamao–Corriu reaction) at room temperature to yield the corresponding biaryls with isolated product yields ranging from 51 to 99%. 1H- and 31P-NMR studies argue that these phosphinous acid