Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2011-08-23
2011-08-23
Davis, Brian J (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C568S829000, C568S830000
Reexamination Certificate
active
08003829
ABSTRACT:
The present invention relates to a method of working up an aluminum-containing reaction product from the production of isopulegol by cyclization of citronellal in the presence of complex compounds, comprising at least one ligand of the formula (I),where R1, R2, R3are chosen from hydrogen, halogen, nitro, C1-C8-alkyl, C1-C8-alkoxy, di(C1-C4-alkyl)amino and aryl; R4, R5are chosen from halogen, nitro, C1-C8-alkyl, C1-C8-alkoxy, di(C1-C4-alkyl)amino, aryl or heteroaryl;in which a) the reaction product is subjected to distillative separation to obtain an isopulegol-enriched top product and an isopulegol-depleted bottom product and b) the ligand of the formula (I) is separated off from the bottom product.Moreover, the invention relates to a method of producing isopulegol, and to a method of producing menthol.
REFERENCES:
patent: 3023253 (1962-02-01), Bain et al.
patent: 3064311 (1962-11-01), Bain et al.
patent: 3218361 (1965-11-01), Webb
patent: 3739035 (1973-06-01), Webb et al.
patent: 5663460 (1997-09-01), Yamamoto et al.
patent: 5814231 (1998-09-01), Borho et al.
patent: 5914012 (1999-06-01), Kaibel et al.
patent: 6774269 (2004-08-01), Iwata et al.
patent: 2005/0169987 (2005-08-01), Korber
patent: 2008/0139852 (2008-06-01), Bergner et al.
patent: 2008/0167504 (2008-07-01), Friedrich et al.
patent: 2008/0207957 (2008-08-01), Friedrich et al.
patent: 2008/0214877 (2008-09-01), Rauls et al.
patent: 2010/0010253 (2010-01-01), Heydrich et al.
patent: 2010/0185024 (2010-07-01), Rauls et al.
patent: 350461 (1961-01-01), None
patent: 2530481 (1977-01-01), None
patent: 2534558 (1977-02-01), None
patent: 3302525 (1984-07-01), None
patent: 19536827 (1997-04-01), None
patent: 10224087 (2003-12-01), None
patent: 0804951 (1997-11-01), None
patent: 1053974 (2000-11-01), None
patent: 1225163 (2002-07-01), None
patent: 1374732 (1964-10-01), None
patent: 2004121903 (2004-04-01), None
patent: WO-03/083028 (2003-10-01), None
patent: WO-2006/056435 (2006-06-01), None
patent: WO-2006/069659 (2006-07-01), None
patent: WO-2006/092433 (2006-09-01), None
Wright, Fred, E., “The crystallization of menthol”, J. Am. Chem. Soc., vol. 39, No. 8, pp. 1515-1525 (1917).
Kuhnert-Brandstaetter, et al. “Thermoanalytische Untersuchungen an Mentholen”, Archiv der Pharmazie, vol. 307, No. 7, pp. 497-503 (1974).
Bernstein J., “Polymorphism in Molecular Crystals”, Oxford, Clarendon Press, 2002, pp. 94-150 (2002).
Van't Land, C., M., “Industrial Crystallization of Melts”, Marcel Dekker, pp. 61-63 (2005).
Arkenbout, G., F., “Melt Crystallization Technology”, Technomic Publishing Company, Inc., Lancaster, Basel, pp. 229-232 (1995).
Wynn, Nicholas P., “Separate Organics by Melt Crystalization”, Chemical Engineering Process, vol. 88, No. 3, (1992), pp. 52-60.
Ebel Klaus
Friedrich Marko
Gralla Gabriele
Heydrich Gunnar
BASF SE
Connolly Bove & Lodge & Hutz LLP
Davis Brian J
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