Method for the isomerization of oxiranes
AssigneeDegussa AG
InventorsMarion Berg, Andreas Grund, Guenter Prescher
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Abstract
The method for the isomerization of oxiranes of the general formula: ##STR1## wherein R.sub.1 and R.sub.3 are hydrogen; R.sub.2 is alkyl or alkylene groups of 3 to 26 carbon atoms or the phenyl group which may also be substituted, and R.sub.4 is hydrogen or alkyl from 1 to 26 carbon atoms and in which the carbon atoms of the epoxy ring can also form components of a cyclic system, wherein as a catalyst there is used alkali iodide and a polyethyleneglycol with an average mol mass of 400 to 10,000 with a boiling point, preferably above the boiling point of the carbonyl compounds that are formed.
Claims10
A method for the isomerization of an oxirane selected from the group consisting of:
- .alpha. epoxyalkane having 10 to 16 carbon atoms,
- 1,2-epoxy-3,3-dimethylbutane,
- cycloalkenoxide with 6 to 12 carbon atoms,
- 1,2-epoxycyclododecandiene-5,9,
- styrene oxide,
- 1-(1,2-epoxypropyl)-3,4-methylenedioxybenzene,
- 1,2,7,8-diepoxyoctane, and
- neohexenoxide,
- comprising contacting said oxirane at an elevated temperature to a catalyst system composed of an alkali iodide and the polyetyleneglycol represented by the formula:
- HO--(CH.sub.2 --CH.sub.2 --O).sub.n H (II)
- wherein n is the number of recurring units of CH.sub.2 --CH.sub.2 --O such that said glycol has an average mol mass of 400 to 10,000, at a temperature of 120.degree. to 250 .degree. C.
Dependencies are inferred from the claim text.