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US 2003/0149285 A1Published application
Method for producing 1,1' binaphthalenylidene-4,4'-diones
OwnerMichael Hauck, Josef Heveling +1inventors
InventorsMichael Hauck, Josef Heveling, Alain Wellig
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Abstract
The invention relates to a method for producing 1,1′ binaphthalenylidene-4,4′-diones of general formula (I), wherein R1 represents C1-6 alkyl, C1-6 alkoxy, phenyl, substituted phenyl, benzyl or benzyloxy; R2, R3, R4, and R5 independently of one another represent hydrogen, C1-6 alkyl, C1-6 alkoxy, phenyl, substituted phenyl, benzyl or benzyloxy. Production takes place by oxidative coupling of the corresponding naphthols in the presence of a peroxide and a precious metal catalyst.
Claims8
A process for preparing 1,1′-binaphthalenylidene-4,4′-diones of the general formula
- 3
- where
- R1 is C1-6-alkyl, C1-6-alkoxy, phenyl, substituted phenyl, benzyl or benzyloxy;
- R2, R3, R4 and R5 are each independently hydrogen, C1-6-alkyl, C1-6-alkoxy, phenyl, substituted phenyl, benzyl or benzyloxy,
- by oxidative coupling of naphthols of the general formula
- 4
- where R1, R2, R3, R4 and R5 are each as defined above,
- characterized in that the oxidative coupling is effected in the presence of a peroxide and also of a noble metal catalyst.
5 more elements
Dependencies are inferred from the claim text.