Acetic Acid → 7-[2-(2,3-Dihydro-1,4-oxathiin-6-yl)-2-n-propoxyiminoacetamido]-3-chloro-3-cephem-4-carboxylic acid

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4-Nitrobenzyl 7-[2-(2,3-dihydro-1,4-oxathiin-6-yl)-2-n-propoxyiminoacetamido]-3-chloro-3-cephem-4-carboxylate (syn isomer, 7.0 g.), acetic acid (2 ml.), water (10 ml.), 10% palladium-carbon (3.5 g.). tetrahydrofuran (100 ml.) and methanol (100 ml.) were treated in a similar manner to that of Example 19-(2). The obtained crystals were recrystallized from methylene chloride (20 ml.) to give 7-[2-(2,3-dihydro-1,4-oxathiin-6-yl)-2-n-propoxyiminoacetamido]-3-chloro-3-cephem-4-carboxylic acid (syn isomer, 2.31 g.).

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