[reaction: see text] Rhodium-catalyzed tandem hydroformylation/acetalization of alpha,omega-alkenediols gives facile access to perhydrofuro[2,3b]furans and perhydrofuro[2,3b]pyrans in good yields. Similarly, benzoannelated tetrahydrofuro[2,3b]furans are obtained by hydroformylation of o-hydroxy cinnamyl alcohols.
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Roggenbuck et al. (2001) studied this question.
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