tin(IV) chloride; 2,3-dicyano-5,6-dichloro-p-benzoquinone in dichloromethane T=-78 - 20°C;

trichloroacetic acid in toluene T=100°C;

in water T=20°C; Cycloaddition; Diels-Alder reaction; 48 h;

1: 4-methoxy-1-vinyl-benzene; (+/-)-2-(p-tolylsulfinyl)-1,4-benzoquinone in water T=20°C; Cycloaddition; Diels-Alder reaction; 48 h; 2: 1-methyoxy-1,3-cyclohexadiene in dichloromethane T=-20°C; Cycloaddition; Elimination; 24 h;