Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Organic compound containing
Reexamination Certificate
2005-04-12
2005-04-12
Nazario-Gonzalez, Porfirio (Department: 1621)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Organic compound containing
C502S166000, C549S212000, C549S220000, C549S221000, C556S021000, C556S023000, C568S015000, C568S017000, C568S881000, C568S885000
Reexamination Certificate
active
06878665
ABSTRACT:
The invention relates to novel diphosphines, in optically pure or racemic form, of formula (I):in which:R1and R2are a (C5-C7)cycloalkyl group, an optionally substituted phenyl group or a 5-membered heteroaryl group; andA is (CH2—CH2) or CF2.The invention further relates to the use of a compound of formula (I) as a ligand for the preparation of a metal complex useful as a chiral catalyst in asymmetric catalysis, and to the chiral metal catalysts comprising at least one ligand of formula (I).
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patent: 6333291 (2001-12-01), Yokozawa et al.
patent: 0 850 945 (1998-07-01), None
Pai, et al. Synthesis of new chiral diposphine ligand (BisbenzodioxanPhos) and Its application In asymmetric catalytic hydrogenation. Tetrahedron Letters, Elsevier Science Publishers, Amsterdam, NL,vol. 43, No. 15 pp. 2789-2792 (2002).
Tsivunin, et al “Phosphorylation of 1, 4-benzodiozane” Journal of General Chemistry USSR., vol. 51, No. 7, pp. 1317-1319 (1981).
Champion Nicolas
Dellis Philippe
Duprat de Paule Sébastien
Genet Jean-Pierre
Vidal Virginie
Nazario-Gonzalez Porfirio
Synkem
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