Mohanty

Mohanty et al. were the first to introduce pendent r-butyl groups in die polymer backbones. The resulting material was quite soluble in aprotic dipolar solvents.83 The PEEK precursors were prepared under a mild reaction condition at 170°C. The polymer precursor can be converted to PEEK in die presence of Lewis acid catalyst A1C13 via a retro Friedel-Crafts alkylation. Approximately 50% of die rerr-butyl substitutes were removed due to die insolubility of the product in die solvent used. Later, Risse et al. showed diat complete cleavage of f< rf-butyl substitutes could be achieved using a strong Lewis acid CF3SO3H as both die catalyst and the reaction medium (Scheme 6.15).84... 

Irback A, Mohanty S. Folding thermodynamics of peptides. Biophys J 2005 88 1560-9. 

S. Mohanty and S. Khataniar. Sodium orthosilicate an effective additive for alkaline steamflood. J Petrol Sci Eng, 14(l-2) 45-49, December 1995. 

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