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US 4,056,545 AGranted
Manufacture of olefinically unsaturated esters
AssigneeBASF SE
InventorsWerner Hoffmann, Manfred Baumann
Life of this patent
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Abstract
A process for the manufacture of .alpha.,.beta.,.gamma.,.delta.-unsaturated esters containing a very high proportion of the 4(Z)-isomer, which are valuable perfume and flavor materials. The .alpha.,.beta.,.gamma.,.delta.-unsaturated esters are manufactured by a Wittig synthesis from phosphoranes and fumaraldehyde-acid esters under specific conditions.
Claims8
A process for the manufacture of .DELTA.,.beta., .gamma.,.delta.-unsaturated esters containing a high proportion of the 2(E), 4(Z)-isomer of the formula:
- ##STR11## wherein R.sup.1 is a saturated hydrocarbon radical of 1 to 4 carbon atoms and R.sup.2 is a linear or branched hydrocarbon radical of 1 to 10 carbon atoms, which process comprises slowly introducing an ether solvent solution of a phosphorane of the formula:
- R.sup.2 -- CH = P(R.sup.3).sub.3 (II)
- wherein R.sup.2 is as defined above and R.sup.3 is phenyl or tolyl, at from 60.degree. to 150.degree. C, into an ether solvent solution of a fumaraldehyde-acid ester of the formula:
- ##STR12## wherein R.sup.1 is as defined above.
1 more element
Dependencies are inferred from the claim text.