Tritylon group alcohol protection

The tritylone group (22), which has been used199 for the protection of alcohols, resembles the trityl group, but it is more stable to acid. It... 

The suitability of tritylone ethers as protecting groups for alcohols has been explored, with cholesterol among model alcohols.The ether (134) was formed from tritylone alcohol and cholesterol under acidic conditions with azeotropic... 

The utility of but-2-enyl ethers as alcohol protecting groups has been described the function is stable to mild acid and base, but is readily cleaved by potassium t-butoxide in DMSO at room temperature. A full description of the use of tritylone ethers as protecting groups has been published. 

An alcohol protecting group cleavable by specific base catalysis is offered as an alternative to the more common acid-labile functions. Tritylone ethers... 

The tritylone ether is used to protect primary hydroxyl groups in the presence of secondary hydroxyl groups. It is prepared by the reaction of an alcohol with 9-phenyl-9-hydroxyanthrone under acid catalysis (cat. TsOH, benzene, reflux, 55-95% yield).It can be cleaved under the harsh conditions of the WolfT-Kishner reduction (H2NNH2, NaOH, 200°, 88% yield), " and by electrolytic reduction (-1.4 V, LiBr, MeOH, 80-85% yield). It is stable to 10% HCl, 55 h. ... 

Tritylone ethers (57), used as acid-stable protecting groups for alcohols, are cleaved under Wolff-Kishner (Huang-Minlon) conditions as the unblocking step. ... 

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