Hoffmann-la Roche Inc.

Renee Zurfluh

Hans Bruderer

The invention is concerned with novel heterocyclic compounds of the formula ##STR1## wherein R is C.sub.1-12 -alkyl, C.sub.3-12 -alkenyl, C.sub.3-12 -alkynyl or C.sub.3-8 -cycloalkyl and X signifies oxygen or sulfur, and none of the possible multiple bonds of R is present in the .alpha.-position of X, and their acid addition salts, processes for their manufacture, pest control compositions which contain these compounds as the active substance as well as the use of such compounds or compositions for the control of pests. Moreover, the invention is concerned with starting materials used for the preparation of such compounds.

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Bulach, Switzerland

Renee Zurfluh