in tetrahydrofuran Me3Ga adding to a freshly prepared soln. of Na pyrazolate, then tropolone adding to give a yellowish ppt.; refluxing for 40 h, filtering, solidremoving;

18-crown-6 ether in N,N-dimethyl-formamide T=150°C; Alkylation; 2 h;

18-crown-6 ether in N,N-dimethyl-formamide T=150°C; Alkylation; 2 h;

in tetrahydrofuran byproducts: 3,5-dimethylpyrazole; (under Ar, Schlenk); mixt. of Fe-complex and Na-salt in THF stirred for 15 min at 40°C; solvent evapd. in vacuo, residue extd. with THF, Al2O3 column chromy. with hexane, THF, washed with EtOH, H2O, acetone, dried in vacuo; elem. anal.;