Preparation of rose oxide predominantly containing the Z isomer

Details Preparation of rose oxide predominantly containing the Z isomer Preparation of rose oxide predominantly containing the Z isomer

1982-12-09

1984-01-31

Chan, Nicky

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30904

Patent

active

044291442

ABSTRACT:
A mixture of Z- and E-2-[2-methylprop-1-en-1-yl]-4-methyltetrahydropyran isomers, of the formulae Z-I and E-I ##STR1## containing not less than 85% of Z-I and not more than 15% of E-I, is prepared by a process wherein 2-[2-methylprop-1-en-1-yl]-4-methylenetetrahydropyran of the formula II ##STR2## is hydrogenated over a platinum dioxide or platinum/charcoal catalyst in the presence of a strongly acidic cation exchanger. The product is a useful fragrance material which also occurs naturally and is known as rose oxide.

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patent: 3166575 (1965-01-01), Naves et al.
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patent: 3252998 (1966-05-01), Ohloff et al.
patent: 3328426 (1967-06-01), Ohloff
patent: 3657278 (1972-04-01), Bose et al.
patent: 4340544 (1982-07-01), Suzukamo et al.

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