benzophenone in neat (no solvent) Kinetics; Irradiation (UV/VIS); photolysis (mercury lamp, 300 nm lamps, merry-go-round unit), irradn. under N2 in pyrex tubes for 50 min.; centrifugation, fitration through a pipette (Celite), detd. by UV;

1'-hydrazinophthalazine hydrochloride in ethanol 4 h; Heating;

CaO in 1,4-dioxane

sodium acetate 1 h; Heating;

1.1: NaH / dioxane / 0.4 h / Heating 1.2: dioxane / 4 h / Heating 2.1: H2SO4; AcOH / 2 h / Heating View Scheme