| (19) |
 |
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(11) |
EP 0 018 833 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
28.01.1981 Bulletin 1981/04 |
| (43) |
Date of publication A2: |
|
12.11.1980 Bulletin 1980/23 |
| (22) |
Date of filing: 01.05.1980 |
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| (84) |
Designated Contracting States: |
|
AT BE CH DE FR GB IT LI NL SE |
| (30) |
Priority: |
04.05.1979 GB 7915620
|
| (71) |
Applicant: BUSH BOAKE ALLEN Limited |
|
() |
|
| (72) |
Inventors: |
|
- Ferber, Gerald John
()
- Botten, Jacqueline Ann
()
- Mellor, Michael
()
|
|
| |
|
| (54) |
Odorous products; preparation thereof |
(57) The dihydropyran and dioxan which may be obtained by the Prins reaction between allo-ocimene
and formaldehyde have been discovered to possess attractive floral odours. They are
useful as ingredients of compounded perfumery compositions. Three novel triene alcohols
are also produced by the Prins reaction which find use as intermediates in the preparation
of the dihydropyrans and dioxans. The cis isomer of the dihydropyran may be converted
into the trans isomer. The dihydropyran wherein at least 10% of the compound takes
the form of the trans isomer is novel.