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Direct C-sulfinylation of Grignard reagents with sulfinic acid (4) in the presence of activating reagents, such as phenyl phosphorodichloridate (1), diphenyl phosphorochloridate (2), and 3-phthalimidooxy-l,2-benzisothiazole 1,1-dioxide, were investigated. β-Keto sulfoxides were also formed by the reaction of enamines with 4 using 1 and 2 under similar conditions.
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NOGUCHI et al. (1983) studied this question.
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