:Acylal
Acylals in organic chemistry are a group of chemical compounds sharing a functional group with the general structure RCH(OOCR)2. Acylals are obtained by reaction of carbonyls with acetic anhydride or other acid anhydrides and a suitable catalyst, for instance with sulfated zirconia{{cite journal | title = A mild and efficient method for the chemoselective synthesis of acylals from aromatic aldehydes and their deprotections catalyzed by sulfated zirconia | first1 = Guillermo E. | last1 = Negrón | first2 = Laura N. | last2 = Palacios | first3 = Deyanira | last3 = Angeles | first4 = Leticia | last4 = Lomas | first5 = Rubén | last5 = Gaviño | journal = J. Braz. Chem. Soc. | volume = 16 | issue = 3a | pages = 490–494 | location = São Paulo | date = May–June 2005 | doi = 10.1590/S0103-50532005000300025 | doi-access = free | url = https://www.redalyc.org/pdf/475/47549225.pdf }} at low temperatures when used as protective groups for aldehydes. High temperature exposure converts the acylal back to the aldehyde.