Splitting up pyran rings

Details Splitting up pyran rings Splitting up pyran rings

C - Chemistry, Metallurgy

07

C

260/584.6, 260/5

C07C 49/17 (2006.01) C07C 45/60 (2006.01) C07C 49/20 (2006.01)

Patent

CA 1102350

ABSTRACT OF THE DISCLOSURE 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 halo- gen-containing or hologen-donating catalyst at a comparatively low temperature, i.e. from 50°C to 130°C. Interesting results are obtained and a selection field is afforded as regards the products of the pyran-ring cleavage.

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