Rapid and highly efficient trimethylsilylation of alcohols and phenols with hexamethyldisilazane (HMDS) catalyzed by reusable zirconyl triflate, [ZrO(OTf)2]
In this paper, rapid and efficient trimethylsilylation of alcohols and phenols with hexamethyldisilazane in the presence of catalytic amounts of ZrO(OTf)(2) is reported. Primary, secondary and tertiary alcohols as well as phenols were efficiently converted to their corresponding TMS ethers in short reaction times at room temperature. It is noteworthy that this method can be used for chemoselective silylation of primary alcohols in the presence of secondary and tertiary alcohols and phenols. (C) 2008 Elsevier B.V. All rights reserved.
Pyridylmethylsilanes as dicarboxyacid receptors: Experimental and theoretical study
A series of literature known (1-3) [1-4] and new Si-tripodal receptors for anion sensing, based on 1-3 pyridylmethyl functionalized side arms as recognition sites, was designed, successfully synthesized and characterized by H-1 and C-13 NMR spectra (4-9). These ligands showed high selectivity and strong binding affinity toward investigated dicarboxyacid anions. The complexes formation was confirmed by F-19 NMR spectra.All supramolecular complexes were structurally authenticated using parametric method 5 (PM5) with the MO-G for SCIGRESS program. The results brought information of the type and nature of intermolecular interactions present in the complexes and extended structures. (C) 2012 Elsevier B.V. All rights reserved.