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The addition of sulfenvl chlorides or sulfur dichloride to unsaturated compounds proceeds via thiiranium ions. The present article reviews the electronic and steric factors influencing the nature of these ions and their effects on subsequent ring opening and product formation. For the purpose of this discussion results primarily from electrophilic ring opening have been chosen to illustrate these factors. Solvent and temperature effects have been disregarded.
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Wolfgang H. Mueller (1969) studied this question.
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