Cs. Penkett et Id. Simpson, New methods of preparing cyclopentenone ketals: The photosolvolysis of 3-alkoxypyridinium tetrafluoroborates, SYNLETT, (1), 1999, pp. 93-95
A new base catalysed method of ketal formation is reported, such that subst
ituted cyclopentenone ketals are prepared from 3-alkoxypyridinium tetrafluo
roborate salts.