Bei der Umsetzung der Hydroxycumarine (I) mit Acetanhydrid in DMSO werden die Spaltprodukte (II) und daneben die kondensierten Cumarine (III) bzw. (IV) erhalten.
The geminal diacylates of a variety of aldehydes were prepared in good yields without any catalysts or solvent by simply refluxing the aldehydes with aliphatic acid anhydrides. The scope of the reactions and relative reactivities of aldehydes and acid anhydrides were examined.
The ecologically benign, efficient method for preparation of acylals avoids the utilization of halogenated solvents, additional additives or catalysts required in established procedures. The protocol seems to be restricted towards aliphatic acid anhydrides. -(RAHMAN, M. A. F. M.; JAHNG*, Y.; Eur.
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