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A New Crystal Engineering Approach for the Synthesis of {[K.18-Crown-6]I₃}_n as a Nanotube-Like and Recyclable Catalyst for the Chemoselective Silylation of Alcohols

M.A. Zolfigol^a,*, E. Kolvari^a, N. Koukabi^a, S. Salehzadeh^a, G. Chehardoli^b, I.S. Tidmarsh^c and K. Niknam^d

^aFaculty of Chemistry, Bu-Ali Sina University, P. O. Box 4135, Hamedan 6517838683, Iran
^bSchoolof Pharmacy, Hamedan University of Medical Sciences, Hamedan, Iran
^cDepartment of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK
^dDepartment of Chemistry, Faculty of Sciences, Persian Gulf University, Bushehr 75169, Iran

     Reaction of 18-crown-6 with KI in ethanol solution followed by addition of iodine (I₂) afforded a unique triiodide salt with a nanotube-like structure ({[K.18-Crown-6]I₃}_n). It is shown that this reagent may be used for the chemoselective trimethylsilylation of alcohols. The synthesis of the crystalline reagent is a good example of crystal engineering. Reagent was recycled and reused.

Keywords: {[K.18-Crown-6]I₃}_n, 18-Crown-6, Triiodide, Nanotube-like, Sylilation of alcohols, Host-guest chemistry