CHROMAN DERIVATIVE AND ITS PRODUCTION

PURPOSE:To efficiently produce a new chroman derivative useful as an intermediate for producing hydrazine-based derivatives having high insecticidal activity. CONSTITUTION:The compound is expressed by formula I [R is 1-2C alkyl or halogen; R is 4-6C tertiary alkyl or halogen; R to R are H or methyl)...

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Bibliographische Detailangaben
Hauptverfasser:	SUGIZAKI HIROYASU, YANAGI MIKIO, TOTANI TETSUYA
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY GENERAL METHODS OF ORGANIC CHEMISTRY HETEROCYCLIC COMPOUNDS METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	PURPOSE:To efficiently produce a new chroman derivative useful as an intermediate for producing hydrazine-based derivatives having high insecticidal activity. CONSTITUTION:The compound is expressed by formula I [R is 1-2C alkyl or halogen; R is 4-6C tertiary alkyl or halogen; R to R are H or methyl), e.g. 8-t-butyl-5-methylchroman. This compound is obtained by catalytically hydrogenating a compound expressed by formula II, e.g. 8-t-butyl-5-methyl-2H- chromene in the presence of a hydrogenating catalyst (e.g. palladium-active carbon or Raney nickel) in a solvent in a hydrogen atmosphere, preferably at 20-50 deg.C temperature. An organic solvent, preferably an alcoholic, an ethereal solvent or a mixed solvent thereof with water is used as the solvent.