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US 4,226,810 AGranted
Splitting up pyran rings
AssigneeAnic S.p.A.
InventorsVincenzo Redaelli, Renato De Simone, Edoardo Platone
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Abstract
A chemical method for splitting the pyran ring of compounds such as 2,6,6-trimethyl-5,6-dihydro-4H-pyran is disclosed which consists in reacting the 4H-pyran derivatives concerned with water and a halogen-containing or halogen-donating catalyst at a comparatively low temperature, i.e. from 50.degree. C. to 130.degree. C. Interesting results are obtained and a selection field is afforded as regards the products of the pyran-ring cleavage.
Claims8
A process for splitting up the ring 2,6,6-trimethyl-5,6-dihydro-4H-pyran comprising the step of heating same in the presence of a water and a halogen catalyst.
Dependencies are inferred from the claim text.