[1-butyl-3-methylimidazolium(1+)][BF4(1-)] T=90°C; Knoevenagel condensation; 2 h;

1: 3-amino-5,5-dimethyl-2-cyclohexen-1-one; 4-bromo-benzaldehyde With toluene-4-sulfonic acid in water T=150°C; 0.0333333 h; microwave irradiation; 2: 1H-indene-1,3(2H)-dione in water T=150°C; 0.05 h; microwave irradiation; Further stages.;

acetic acid T=80°C; 0.166667 h; microwave irradiation;

1: 2-lt;4-Brom-benzylgt;-indandion-(1,3) With potassium hydride in acetonitrile T=20°C; 0.333333 h; Inert atmosphereGlovebox; 2: 4-acetylamino-2,2,6,6-tetramethylpiperidine-1-oxoammonium in acetonitrile T=24.84°C; Inert atmosphereGlovebox; Thermodynamic data;