Manganese(IV) oxide
Recent Literature
Manganese dioxide is employed as an in situ oxidant for the one-pot conversion
of alcohols into imines. In combination with polymer-supported cyanoborohydride
(PSCBH), a one-pot oxidation-imine formation-reduction sequence enables alcohols
to be converted directly into both secondary and tertiary amines.
L. Blackburn, R. J. K. Taylor, Org. Lett.,
2001, 3, 1637-1639.
N-Heterocyclic carbenes catalyze the oxidation of various allylic, propargylic,
and benzylic alcohols to esters with manganese(IV) oxide in excellent yields.
Saturated esters can also be accessed from aldehydes using this method. A
desymmetration of meso-1,2-diols using a chiral catalyst is described.
B. E. Maki, A. Chan, E. M. Phillips, K. A. Scheidt, Org. Lett., 2007,
9, 371-374.
Improved Dimethylsulfoxonium Methylide Cyclopropanation Procedures,
Including a Tandem Oxidation Variant
R. J. Paxton, R. J. K. Taylor, Synlett, 2007, 633-637.
Permanganate supported on active manganese dioxide can be used
effectively for the oxidation of arenes, alcohols and sulfides under
heterogeneous or solvent-free conditions.
A. Shaabania, P. Mirzaeia, S. Naderia, D. G. Leeb, Tetrahedron,
2004, 60, 11415-11420.
A. Shaabania, P. Mirzaeia, S. Naderia, D. G. Leeb, Tetrahedron,
2004, 60, 11415-11420.
A. Shaabania, P. Mirzaeia, S. Naderia, D. G. Leeb, Tetrahedron,
2004, 60, 11415-11420.
The reaction of 1-aryl-2,2,2-trifluorodiazoethanes with alkenes provides
trifluoromethyl-substituted cyclopropanes with high diastereoselectivity and
enantioselectivity in the presence of an adamantylglycine-derived dirhodium
complex Rh2(R-PTAD)4 as catalyst.
J. R. Denton, D. Sukumaran, H. M. L. Davies, Org. Lett., 2007,
9, 2625-2628.
4-Substituted-1,4-dihydropyridines are readily and efficiently
aromatized in only one minute using commercial manganese dioxide in the
absence of an inorganic support at 100 °C under microwave irradiation.
This rapid procedure gives the dehydrogenated or 4-dealkylated product
in excellent yield.
M. C. Bagley, M. C. Lubinu,
Synthesis, 2006, 1283-1288.
