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When α-alkoxy-β-ketophosphonates, prepared by the Rh(II) mediated insertion reaction of α-diazo-β-ketophosphonates into the OH bond of primary alcohols, were reduced either by NaBH4 in the presence of CaCl2 or by DIBAL, they respectively gave the corresponding anti or syn stereomeric hydroxyphosphonates with pronounced to complete stereoselectivity. Submitted to the action of potassium tert-butoxyde,...
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