Dinitrogen Tetraoxide Complexes of Iron(III) and Copper(II) Nitrates as Versatile Reagents for Organic Syntheses. Efficient Oxidative Deprotection of Silyl or Tetrahydropyranyl Ethers, Acetals, and Thioacetals
作者:Habib Firouzabadi、Nasser Iranpoor、Mohammad Ali Zolfigol
DOI:10.1246/bcsj.71.2169
日期:1998.9
efficiently in the absence of solvents at room temperature. Over-oxidation of the products has not been observed in these reactions. A synergic effect of N2O4 upon the oxidation abilities of metal nitrates is observed.
Chloral Hydrate as a Water Carrier for the Efficient Deprotection of Acetals, Dithioacetals, and Tetrahydropyranyl Ethers in Organic Solvents
作者:Sosale Chandrasekhar、Annadka Shrinidhi
DOI:10.1080/00397911.2013.876652
日期:2014.7.3
Abstract The efficientdeprotection of several acetals, dithioacetals, and tetrahydropyranyl (THP) ethers under ambient conditions, using chloral hydrate in hexane, is described. Excellent yields were realized for a wide range of both aliphatic and aromatic substrates. The method is characterized by mild conditions (room temperatures or below), simple workup, and the ready availability of chloral hydrate
A variety of acetals and ketals are efficiently and rapidly converted to the corresponding carbonyl compounds by using WCl6 in dichloromethane or acetonitrile at room temperature.
在室温下,在二氯甲烷或乙腈中使用 WCl6 可将各种缩醛和缩酮高效快速地转化为相应的羰基化合物。
Pyridinium poly(hydrogen fluoride)-assisted cleavage of acetals and ketals
Acetals, including ketals, were smoothly cleaved by the action of pyridinium poly(hydrogenfluoride) without addition of water or an alcohol in an anhydrous solvent.
在无水溶剂中不加水或醇的情况下,缩醛(包括缩酮)在吡啶鎓聚(氟化氢)的作用下被平滑地裂解。
A remarkable iodine-catalyzed protection of carbonyl compounds
作者:Bimal K. Banik、Marin Chapa、Jocabed Marquez、Magda Cardona
DOI:10.1016/j.tetlet.2005.01.176
日期:2005.3
report here a remarkably simple molecular iodine-catalyzed protection method for various carbonyl compounds as ketals in a general reaction. The iodine-catalyzed reaction of mandelic acid and lacticacid with several aldehydes has furnished a highly diastereoselectivesynthesis of cis and trans dioxolanones.