Reaktion #65965

Reaktionsgleichung

1-Naphthol methanol

ammonia

SnCl4

alpha-naphthol

1-naphthol

→

2-methyl-1-naphthol

4-methyl-naphthol

Lösungsmittel

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigethe following reaction scheme
2. 2
   SonstigeThe resulting precipitate was dried
3. 3
   Sonstigecrushed
4. 4
   Sonstigeto form a catalyst

Vorschrift

Tasaka et al (JP 50047958) disclose the following reaction scheme: methylation of alpha-naphthol at position 2 was effected by vapor phase methylation of 1-naphthol at elevated temperature in the presence of catalyst comprising CeO2 and Sb2O3, GeO2, SnO2 or MgO. Aqueous ammonia (28%) was added to a mixture of SnCl4 and Ce(NO3)4 -2NH4NO3 2H2O in water at 50° C. The resulting precipitate was dried, calcinated for 3 hours at 600° C., and crushed to form a catalyst. 1-Naphthol/methanol mixture (1:6 molar) was passed over the catalyst at 425° C. and 1000 hr-1 space velocity to give 72.5 wt. % 2-methyl-1-naphthol, 2.6 wt. % 4-methyl-naphthol and 2.2 wt. % of other material.

Quelle