ChemInform Abstract The allyloxy(allylthio)thienopyrimidones (III), prepared by allylation of the phenolates(thiolates) (I), react with bromine or iodine to give the tricyclic compounds (IV) mentioned in the title.

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258ChemInform Abstract The ester (I) reacts with the selenium tetrahalides, formed in situ from selenium dioxide (II) and the corresponding hydrogen halides (III), exclusively at the C=C bond of the allyl group to give the Markovnikov products (IV). The analogous reaction with tellurium tetrahalides under rearrangement leads to the formation of the adducts (VI). (Mechanism).

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