1: With naphthalene; lithium in tetrahydrofuran T=-15°C; Ring cleavage; metalation; 7 h; 2: With water in tetrahydrofuran Substitution; reduction; 0.25 h; Title compound not separated from byproducts;

1: With 4,4'-di-tert-butylbiphenyl; lithium in tetrahydrofuran T=-50°C; 6 h; 2: With water in tetrahydrofuran T=-50°C; 0.25 h; Further stages.;

1: With naphthalene; lithium in tetrahydrofuran T=-15°C; Ring cleavage; metalation; 7 h; 2: With water in tetrahydrofuran Substitution; reduction; 0.25 h; Title compound not separated from byproducts;

potassium permanganate; N-benzyl-N,N,N-triethylammonium chloride in dichloromethane 6 h; Heating;