The original poster wanted to dehalogenate the bisulfite adduct of a p-Halophenylacetone, and I have cotten used to that many people here just say "aw, fuck it" when my advice involves adding another step to their original route... I cannot help becoming a little cynical. The problem is definitely not with the actual acetal protection, but if the poster would bother to do it or not...
In this case the acetalization of the ketone would be effected by refluxing the phenylacetone in toluene with excess ethyleneglycol and 1% of a suitable acid catalyst (tosic acid) while separating the formed water using a dean-stark apparatus (the water removal drives the rxn forward). Workup involves washing twice with 5% bicarbonate, once with brine, dry the solution over MgSO4 (or even better Na2SO4, as it is less acidic) and evaporating the toluene in vacuo. Ideally this Phenyl-2-propanone ethylidene acetal should now be vacuum distilled before the next step.
Deprotection is a breeze - heating the acetal in 5% H2SO4, or by any other well-known method, UTFSE.
