in ethylene glycol dimethyl ether all operations in sealed evacuated tubes with thoroughly dried and degassed solvents; La cutting and t-BuOCu stirred at ca. 20° for 35 h; excess of La and copper ppt. sepd. by centrifugation; reaction mixt. concd. and kept at 80° until complete dissolution of a finely dispersed ppt.; cooled slowly to 20°; crystals sepd. and dried in vacuo; identified by elem. anal.;

in ethylene glycol dimethyl ether all operations in sealed evacuated tubes with thoroughly dried and degassed solvents; Nd cutting and t-BuOCu stirred at ca. 20° for 35 h; excess of Nd and copper ppt. sepd. by centrifugation; reaction mixt. concd. and kept at 80° until complete dissolution of a finely dispersed ppt.; cooled slowly to 20°; crystals sepd. and dried in vacuo; identified by elem. anal.;

in ethylene glycol dimethyl ether all operations in sealed evacuated tubes with thoroughly dried and degassed solvents; Sm cutting and t-BuOCu stirred at ca. 20° for 35 h; excess of Sm and copper ppt. sepd. by centrifugation; reaction mixt. concd. and kept at 80° until complete dissolution of a finely dispersed ppt.; cooled slowly to 20°; crystals sepd. and dried in vacuo; identified by elem. anal., IR spec.;

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