Organic compounds -- part of the class 532-570 series – Organic compounds – Phosphorus esters
Reexamination Certificate
2005-12-27
2005-12-27
McKenzie, Thomas C. (Department: 1624)
Organic compounds -- part of the class 532-570 series
Organic compounds
Phosphorus esters
C558S162000, C568S010000
Reexamination Certificate
active
06979746
ABSTRACT:
A diphosphonic acid ester of formula [VII] or [VII′] and a diphosphonium salt of formula [VIII] or [VIII′] are provided:wherein R75, R76, R75′and R76′may be the same or different and independently represent an alkyl or alkenyl group having from 1 to 4 carbon atoms, a cyclohexyl group or a phenyl group, R77, R78, R79and R80may be the same or different provided that at least three thereof are cyano groups and the others independently represent a hydrogen atom, a cyano group, a nitro group or a halogen atom, R77′, R78′, R79′and R80′may be the same or different and independently represent a group selected from a hydrogen atom and a halogen atom provided that at least three thereof are fluorine atoms and X represents a halogen atom.These compounds are useful as synthetic intermediates for the preparation of luminescent bis(aminostyryl)benzene compounds.
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Ichimura Mari
Ishibashi Tadashi
Takada Ichinori
Tamura Shinichiro
McKenzie Thomas C.
Sonnenschein Nath & Rosenthal LLP
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