Splitting up pyran rings

Details Splitting up pyran rings Splitting up pyran rings

1978-11-28

1980-10-07

Trousof, Natalie

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568414, 568417, C07C 4556

Patent

active

042268109

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.

REFERENCES:
patent: 2624764 (1953-01-01), Emerson et al.
patent: 3009959 (1961-11-01), Heath et al.
patent: 3255258 (1966-06-01), Charles et al.
patent: 3686321 (1972-08-01), Mueller et al.
patent: 3864403 (1975-02-01), Ember
Stone et al., J. Org. Chem., vol. 42(12), pp. 2151-2154 (1977).

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