1: 2,2'-methylene-5',6''-methylene-p-terpenyl With sodium t-butanolate in dimethyl sulfoxide T=20 - 65°C; 0.5 h; 2: methyl iodide in dimethyl sulfoxide T=65°C; 7 h;

1: 2,2'-methylene-5',6''-methylene-p-terpenyl With potassium tert-butylate in dimethyl sulfoxide T=5°C; 2: methyl iodide in dimethyl sulfoxide T=5°C;

hydrogenchloride in dichloromethane; water 5 h; Reflux;

sodium hydroxide in dimethyl sulfoxide

in tetrahydrofuran T=-78 - 20°C;

1: n-butyllithium / tetrahydrofuran / -78 - -40 °C 2: tetrakis(triphenylphosphine) palladium(0); potassium carbonate / tetrahydrofuran / 18 h / Reflux 3: pyridine; potassium permanganate / water / 24 h / Reflux 4: thionyl chloride / 5 h / Reflux 5: tetrahydrofuran / 10 h / Inert atmosphere; Reflux 6: hydrogenchloride / dichloromethane; water / 5 h / Reflux View Scheme

1: tetrabutylammomium bromide; palladium diacetate; potassium carbonate / water / 2 h / 70 °C 2: pyridine; potassium permanganate / water / 24 h / Reflux 3: thionyl chloride / 5 h / Reflux 4: tetrahydrofuran / 10 h / Inert atmosphere; Reflux 5: hydrogenchloride / dichloromethane; water / 5 h / Reflux View Scheme

1: pyridine; potassium permanganate / water / 24 h / Reflux 2: thionyl chloride / 5 h / Reflux 3: tetrahydrofuran / 10 h / Inert atmosphere; Reflux 4: hydrogenchloride / dichloromethane; water / 5 h / Reflux View Scheme

1: thionyl chloride / 5 h / Reflux 2: tetrahydrofuran / 10 h / Inert atmosphere; Reflux 3: hydrogenchloride / dichloromethane; water / 5 h / Reflux View Scheme

1: tetrakis(triphenylphosphine) palladium(0); potassium carbonate / tetrahydrofuran / 18 h / Reflux 2: pyridine; potassium permanganate / water / 24 h / Reflux 3: thionyl chloride / 5 h / Reflux 4: tetrahydrofuran / 10 h / Inert atmosphere; Reflux 5: hydrogenchloride / dichloromethane; water / 5 h / Reflux View Scheme