Process for the production of substituted vinylbenzenes
AssigneeLonza Ltd.
InventorsAleksander Warm, David Laffan
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Abstract
A process for the production of substituted vinylbenzenes of the general formula: ##STR1## wherein R is a lower alkyl group having 1 to 4 C atoms, R.sub.1 is hydrogen or an acetyl group and R.sub.2 is hydrogen, a lower alkyl group having 1 to 4 C atoms or a benzyl group. A trialkylhydroquinone is cyclized with an aldehyde to an acetal and the latter is pyrolized to the end product. The substituted vinylbenzenes are valuable intermediate products in the synthesis of antioxidants.
Claims4
A substituted vinylbenzene of formula:
- ##STR18## wherein R is a lower alkyl group having 1 to 4 C atoms, R.sub.1 is hydrogen or an acetyl group and R.sub.2 is hydrogen, a lower alkyl group having 1 to 4 C atoms or a benzyl group, provided that when R is a methyl group, R.sub.1 R.sub.2 are not hydrogen.
Acetic acid-4-hydroxy-2,5-6-trimethyl-3-vinylphenyl ester of formula:
- ##STR19##
A substituted vinylbenzene of formula:
- ##STR20## wherein R is a lower alkyl group having 1 to 4 C atoms, R.sub.1 is an acetyl group, and R.sub.2 is hydrogen, a lower alkyl group having 1 to 4 C atoms or a benzyl group.
A substituted vinylbenzene of formula:
- ##STR21## wherein R is a lower alkyl group having 1 to 4 C atoms, R.sub.1 is hydrogen or an acetyl group, and R.sub.2 is a lower alkyl group having 1 to 4 C atoms or a benzyl group.
Dependencies are inferred from the claim text.