W. Heilmayer et al., A CONVENIENT DE-NOVO SYNTHESIS OF FUNCTIONALIZED 2,4,6,8-TETRAOXAADAMANTANES, Journal of the Chemical Society, Chemical Communications, (7), 1995, pp. 797-798
Trioxabicyclononadienes 2 and 4, easily obtained by addition of nucleo
philes to the stable alpha-oxoketene 1, are transformed into the corre
sponding 2,4,6,8-tetraoxaadamantanes 3 and 5 in high yields by acid-ca
talysed hydrolysis.