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Montmorillonite K 10 and montmorillonite KSF were found to be new and reusable catalysts for chemoselective conversion of amines to N-t-Boc derivatives at room temperature under solvent-free conditions without competitive formation of isocyanate, urea and N,N-di-t-Boc. Various aromatic, heteroaromatic and aliphatic amines afforded N-t-butylcarbamates in excellent yields on treatment with (Boc) ...
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