Keywords
acetaldehyde
acetals
Diels–Alder adducts
levoglucosenone
McMurry reaction
pinacol reaction
Abstract
Reactions of acetaldehyde with Diels–Alder adducts of levoglucosenone with butadiene, isoprene, and cyclohexa-diene assisted by low-valence titanium afford products of acetaldehyde addition to the acetal center with opening of the 1,6-anhydro bridge. In the case of the cyclopentadiene adduct, the reaction gives the product of addition of the ethyl substituent to the acetal center while the 1,6-anhydro bridge remains unchanged.
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