MANUFACTURE OF 3,4-DIHYDRO-ALPHA-PYRON, LACTONE AND SUBSTITUTED LACTONE AND THEIR MANUFACTURE

MANUFACTURE OF 3,4-DIHYDRO-ALPHA-PYRON, LACTONE AND SUBSTITUTED LACTONE AND THEIR MANUFACTURE

1. Process for the production of 3,4-dihydro-alpha-pyrones of the formula see diagramm : EP0075680,P5,F18 wherein R**1 , R**2 and R**3 can be the same or different and stand for hydrogen or alkyl groups with 1 to 10 C-atoms, characterised in that a compound of the formula see diagramm : EP0075680,P5...

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1. Verfasser: HANSUUGEORUKU SHIYUMITSUTO
Format: Patent
Sprache:eng
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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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Zusammenfassung:1. Process for the production of 3,4-dihydro-alpha-pyrones of the formula see diagramm : EP0075680,P5,F18 wherein R**1 , R**2 and R**3 can be the same or different and stand for hydrogen or alkyl groups with 1 to 10 C-atoms, characterised in that a compound of the formula see diagramm : EP0075680,P5,F4 wherein R**1 , R**2 and R**3 have the aforementioned meaning and R**4 denotes the residues see diagramm : EP0075680,P5,F6 see diagramm : EP0075680,P5,F7 see diagramm : EP0075680,P5,F8 or -O-R**5 wherein R**5 stands for lower alkyl groups, is heated.