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Protection of aliphatic and aromatic aldehydes as 1,1‐diacetates using VSO4.5H2O under solvent‐free conditions is carried out. The products are obtained in good to excellent yields. Ketones are not affected under these conditions.

Nitration O 0255 Nitration of Aromatic Compounds Catalyzed by Divanadium-Substituted Molybdophoshoric Acid, H 5 [PMo 10 V 2 O 40 ]. -ortho-and para-Nitro compounds are obtained in good to excellent yields under mild reaction conditions. -(HERAVI*, M. M.; BAKHTIARI, K.; BENMORAD, T.; BAMOHARRAM, F. F.; OSKOOIE, H. A.; TEHRANI, M. H.; Monatsh. Chem. 138 (2007) 5, 449-452; Dep. Chem., Sch. Sci., Azzahra Univ., Tehran, Iran; Eng.) -M. Bohle 34-039