1: 1.65 g / potassium hydroxyde / H2O; various solvent(s) / 10 h / Heating 2: 960 mg / lithium aluminium hydride / tetrahydrofuran / 3 h / Heating 3: 1.) boron trifluoride-ether; 2.) dichlorodicyanobenzoquinone / 1.) reflux, 4.5 h; 2.) benzene, reflux, 3 h View Scheme

1: 1.65 g / potassium hydroxyde / H2O; various solvent(s) / 10 h / Heating 2: 960 mg / lithium aluminium hydride / tetrahydrofuran / 3 h / Heating 3: 1.) boron trifluoride-ether; 2.) dichlorodicyanobenzoquinone / 1.) reflux, 4.5 h; 2.) benzene, reflux, 3 h View Scheme