Compounds of the formula ##STR1## where X represents O or S and R represents C.sub.1-4 alkyl, phenyl or (C.sub.1-4 alkyl)phenyl. The compounds are prepared by reacting the ring-opened intermediate, obtained by reacting cis-1-(3-chloro-2-propenyl)-3,5,7-triaza-1-azoniatricyclo (3. 3.1.1.sup.3,7) decane chloride with excess aqueous sodium hydroxide, with an equivalent amount of a corresponding halide formate or halide thioformate, ClC=X(OR), at about 0° C in the presenceof a hydrogen chloride acceptor and using a non-nucleophilic organic solvent as reaction medium. The carbamate products have antimicrobial utility.
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