Exploring the chelating potential of 1,3-bis(furyl)-1,1,3,3-tetramethyldisilazides

摘要

A range of furyl-substituted silylamides of the group 1 metals have been isolated and structurally characterized. The lithium salts of the neutral compounds (RMe2Si)(2)NH [1H, R = furyl; 2H, R = 2-methylfuryl; 3H, R = 2-trimethylsilylfuryl] are formed directly in a one-pot reaction between the chloraminosilane, (ClMe2Si)(2)NH and three equivalents of the appropriate furyl lithium species. Conversion of the Li-salts to the neutral compounds 1H and 2H by quenching with NH4Cl, and reaction of the unpurified products with KNH2 afforded the corresponding potassium salts K{1} and K{2}. The crystal structures of [Li{2}](2), [Li{3}](2)(THF), [K{1}(toluene)](2) and [K{2}(toluene)](2) have been determined, in which, as predicted, the ability of the furyl group to coordinate to the metal is related to the size of the substituent in the 2-position. (c) 2005 Elsevier B.V. All rights reserved.