The treatment ofSterculia foetida oil with concentrated aqueous HCl or with HBr in acetic acid results in the addition of one hydrohalogen molecule per cyclopropenoid moiety. Iodine value (I.V.) and infrared absorption measurements indicate that the mechanism parallels that of the polymerization of sterculic acid and involves the formation of four isomeric monoun‐saturated monohalo moieties.
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Bailey et al. (1963) studied this question.
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