Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2011-07-19
2011-07-19
Saeed, Kamal A (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
active
07982052
ABSTRACT:
Process for the preparation of stable nitroxyl radicals (I) starting from N-benzylphthalimide in two steps. In the first step, the intermediate N-benzyl-1,1,3,3-tetra-alkylisoindoline is prepared by treatment with a Grignard reagent, prepared in methyl-tert-butyl ether, of N-benzylphthalimide, obtained in the same reaction environment starting from phthalic anhydride and benzylamine. In the second step, the N-benzyl-1,1,3,3-tetra-alkylisoindoline is transformed into the nitroxyl radical by hydrogenolysis and subsequent oxidation with hydrogen peroxide in the presence of a catalyst selected from acids and salts of polymolybdic or polytungstic acids.
REFERENCES:
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patent: 2007/0282113 (2007-12-01), Caldararo et al.
patent: 2004 078720 (2004-09-01), None
patent: 2006 029697 (2006-03-01), None
Griffiths, Peter G. et al., “Synthesis of the Radical Scavenger 1,1,3,3-Tetramethylisoindolin-2-yloxyl”, Australian Journal of Chemistry, vol. 36, No. 2, pp. 397-401, XP 000566821, (1983).
Caldararo Maria
Po Riccardo
Ricci Marco
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Polimeri Europa S.p.A.
Saeed Kamal A
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