2005

DeprotectionO 0345 A High Loading Sulfonic Acid-Functionalized Ordered Nanoporous Silica as an

Efficient and Recyclable Catalyst for Chemoselective Deprotection of tert-Butyl-dimethylsilyl Ethers. — Significant differences in the reactivity of aliphatic and aro-matic Tbs-ethers are observed allowing a selective deprotection process [cf. (XIII)]. The catalyst is thermally stable up to 240 °C and can be reused for at least 7 cycles with-out any loss of activity. — (KARIMI*, B.; ZAREYEE, D.; Tetrahedron Lett. 46 (2005) 27, 4661-4665; Dep. Chem., Inst. Adv. Stud. Basic Sci., Gava Zang, Zanjan 45195, Iran; Eng.) — Mais

42- 065