18-crown-6 ether in sulfolane; diethylene glycol dimethyl ether T=170°C; 15 h;

1: in diethyl ether T=0 - 20°C; 2: in acetone 96 h; Irradiation;

1: 49 percent / LAH / tetrahydrofuran / 20 h / -5 - 0 °C 2: 40 percent / PCC, Na2SO4 / CH2Cl2 / 15 h / Ambient temperature 3: Na2SO4 / benzene / 12 h / Ambient temperature 4: 15 percent Chromat. / benzene / 12 h / 200 °C / other temperature, time, Ea; thermal isomerisation of N-arylmethyl and N-alkyl-2,2-dihalogenocyclopropyl imines, effect of various additivities View Scheme