The product of the reaction of D-ribono-1,4-lactone with benzaldehyde and concentrated HCl has been shown, by X-ray crystallography of its acetate, to be 3,4-O-(R)-benzylidene-D-ribono-1,5-lactone and not the 3,5-acetal as previously suggested; with ZnCl2 as catalyst the products are 2,3-O-(R)- and -(S)-benzylidene-D-ribono-1,4-lactone the former preponderating.
N. Baggett, J. G. Buchanan, M. Y. Fatah, C. H. Lachut, K. J. McCullough and J. M. Webber, J. Chem. Soc., Chem. Commun., 1985, 1826 DOI: 10.1039/C39850001826
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