Corrigendum to “An efficient method for the synthesis of acylals from aldehydes using silica-supported perchloric acid (HClO4–SiO2)”

Silica‐supported perchloric acid as a recyclable catalyst for efficient trimethylsilyl cyanide addition to aldehydes

“…Because of their larger surface area, they provide better selectivity, higher activities and better mechanical and thermal stabilities, and can easily be recovered from reaction mixtures and reused. As found recently, silicasupported perchloric acid has emerged as a poweful catalyst for various organic transformations, including synthesis of bisindolylmethanes and bis-indolylglycoconjugates, [15] synthesis of 1,4-dihydropyridines, [16] synthesis of acylals from aldehydes, [17] transformation of thioglycosides to their corresponding 1-Oacetates, [18] 1,3-dithiolane/dithiane formation, [19] tetrahydropyranylation, oxathioacetalization and thioacetalization, [20] synthesis of coumarins via Pechmann condensation, [21] N-tertbutoxycarbonylation of amines, [22] selective removal of anomeric O-acetate groups in carbohydrates, [23] cleavage of benzylidene acetals, [24] glycosylation using sugar trichloroacetimidates as glycosyl donors, [25] selective deprotection of terminal isopropylidene acetals and trityl ethers, [26] Ferrier rearrangement of glycals, [27] acetal/ketal formation [28] and chemoselective carbon-sulfur bond formation. [29] Herein we report our findings on the Winkler reaction using HClO 4 -SiO 2 (0.6 mol%) to act as a highly effective catalyst.…”