Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2006-07-25
2006-07-25
Dentz, Bernard (Department: 1625)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C548S101000, C548S111000, C549S006000, C549S216000, C549S222000, C558S085000, C558S155000, C556S021000, C556S023000, C568S017000
Reexamination Certificate
active
07081533
ABSTRACT:
The present invention concerns novel unsymmetrical chiral diphosphines of a mixed aliphatic-aromatic type and processes for synthesizing them, complexes of these compounds and their use as catalysts.
REFERENCES:
Hupe et al, Organic Letters, 3(1), p. 127-130, Dec. 13, 2000.
E. Hupe et al.: “Steroselective synthesis of secondary organuzinc reagents and their reaction with heteroaromatic electrophiles” Organic Letters, vol. 3, No. 1, pp. 127-130 2001.
T. Benicori et al.: “2,2′, 5,5′-tetramethyl-4,4′-bis(diphenylphosphino)-3,3′-bithiophene: A new, very efficient, easily accessible chiral biheteroaromatic ligand for homohenous stereoselective catalysis” J. Org. Chem., vol. 65, No. 7, pp. 2043-2047 2000.
G. Zhu et al.: “Highley enantioselective rh-catalyzed hydrogenations with a new chiral 1,4-bisphosphine containing a cyclic backbone” J. Am. Chem. Soc., vol. 119, No. 7, pp. 1799-1800.
M. Cereghetti et al.: “(R)- and (S)-6,6′-dimethyl- and 6,6′-dimethoxy-2,2′-diiodo-1, 1′-biphenyls: versatile intermediates for the synthesis of atropisomeric diphosphine ligands” Tetrahedron Letters, vol. 37, No. 30, pp. 5347-5250 1996.
A. Boudier et al.: “Palladium catalyzed stereoselective cross-couplings and acytations of chiral secondary diorgaozincs” Tetrahedron Letters, vol. 40, pp. 687-690 1999.
Bosch Boris E
Dingerdissen Uwe
Hupe Eike
Knochel Paul
Monsees Axel
Degussa - AG
Dentz Bernard
Oblon, Spivak, McClelland, Maier & Neutadts, P.C.
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