Synthesis of perfluoroalkyl(Methoxy)borates and -boranes

Abstract

Interaction of lithium perfluoroalkyltrimethoxyborates, Li[C nF2n+IB(OMe)3] (n = 3, 4, 6), with ClSiMe 3 results in formation of the corresponding esters C nF2n+IB(OMe)2 in 93-95 % yields. They are sufficiently stable both CH2Cl2 and etherical solvents (etiler, THF) and react with C2F5Li to give Li[(C nF2n+I)(C2F5)B(OMe)2]. Metathesis of the latter with KF leads to corresponding potassium salts.