Abstract
Reactions of six-membered cyclic boronic acidesters with aldehydes are known to result in formationof the corresponding 1,3-dioxanes [1, 2]. The presentcommunication reports on the stereochemical featuresof reactions of a series of 2,4,5-substituted 1,3,2-di-oxaborinanes I3 III with paraformaldehyde. Accordingto the GLC data, these reactions lead to formationof 4,5-disubstituted 1,3-dioxanesIV3 VI:
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