Uniroyal Inc.

Allan K Tsai

Arthur D Brewer

Duncan D Lennox

A method of making certain 2,3-dihydro-1,4-dithiins of the following formula by the action of alpha-hydroxyketones (acyloins) of 1,2-dithiols: ##STR1## wherein R.sup.1 and R.sup.2 are hydrogen or alkyl having 1 to 6 carbon atoms or are joined together to form a ring with 3 or 4 methylene groups, and R.sup.3 and R.sup.4 are hydrogen or the same or different alkyl groups having 1 to 10 carbon atoms, which alkyl groups may be substituted with lower alkoxy groups.

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Waterloo, Canada

Allan K Tsai