The addition of benzoic acid as a co-catalyst facilitating cooperative Brønsted acid catalysis was found to be valuable for reactions involving phenols and higher substituted alcohols. Mechanistic investigations, including kinetic and 1H NMR binding studies in conjunction with density function theory calculations, are described that collectively support a Brønsted acid mode of catalysis.
Silica‐Gel‐Supported Aluminium Chloride: A Stable, Efficient, Selective, and Reusable Catalyst for Tetrahydropyranylation of Alcohols and Phenols
作者:Kaveh Parvanak Borujeni
DOI:10.1080/00397910600764725
日期:2006.9
Abstract A simple, effective, and highly chemoselective method to form 2‐tetrahydropyranyl ethers of alcohols and phenols in the presence of silica‐gel‐supported aluminium chloride as a heterogeneous Lewisacidcatalyst is described. The catalyst can be easily recovered and reused without appreciable change in its efficiency.
Chemoselective tetrahydropyranylation of alcohols and phenols using polystyrene supported aluminium chloride as a catalyst
作者:Bahman Tamami、Kaveh Parvanak Borujeny
DOI:10.1016/j.tetlet.2003.11.056
日期:2004.1
A simple, efficient and highly chemoselective method for tetrahydropyranylation of alcohols and phenols has been developed by their reaction with 3,4-dihydro-2H-pyran at room temperature in the presence of a catalytic amount of polystyrenesupported AlCl3. The method is also highly selective for monoprotection of symmetrical diols.
Mild and efficient tetrahydropyranylation and deprotection of alcohols catalyzed by heteropoly acids
作者:Árpád Molnár、Tímea Beregszászi
DOI:10.1016/0040-4039(96)01965-x
日期:1996.11
A simple, mild and effective method to form 2-tetrahydropyranyl ethers of alcohols and phenol and the removal of this protective group in the presence of heteropoly acids as catalysts are described.
Zirconium Sulfophenyl Phosphonate Zr(O3PCH3)(1.2)(O3PC6H4SO3H)(0.8) was found to be an efficient heterogeneous catalyst for the tetrahydropyranylation of alcohols and phenols. (C) 1998 Elsevier Science Ltd. All rights reserved.