n-butyllithium in ethylene glycol dimethyl ether; hexane
n-BuLi in hexane was added to a frozen soln. of amidine in monoglyme, mixt. allowed to warm to room temp. and stand for 0.5 h; prepd. mixt. wastransferred onto a frozen mixt. of CuCl and monoglyme; stirring at roomtemp. for 12 h; filtration, washing with hexane, drying in vac., recrystn. from CH2Cl2;elem. anal.;
