Nickel compounds cause the coupling reaction between allyl and aryl halides. Hydrolysis of allyl isothiocyanate gives allylamine. Rearrangements of carbanions of allyl ethers are anionic. Molecules that can form allyl or benzyl carbocations are especially reactive. The electrophilic chemical allyl isothiocyanate causes nociceptive sensitization in larvae. A further metabolite allyl methyl sulfide is responsible for garlic breath. The organic halide reactant can be alkenyl, aryl, allyl, or propargyl. This is because garlic's strong-smelling sulfur compounds are metabolized, forming allyl methyl sulfide. The monomer DADMAC is formed by reacting two equivalents of allyl chloride with dimethylamine. The compound consists of a phenyl group attached to allyl. Other routes are from butadiene, allyl acetate and succinic acid. This is caused by allyl methyl sulfide (AMS). Pure samples can be prepared by hydrolysis of allyl isothiocyanate. In the Doyle-Kirmse reaction certain diazo compounds react with allyl sulfides to the homoallyl sulfide. A different oxidation pathway of the allyl side chain can form safrole epoxide.