1: 1-(Chloromethyl)-2-iodobenzene With iso-propylmagnesium bromide in tetrahydrofuran T=-10°C; Substitution; 1.5 h; 2: isobutyraldehyde in tetrahydrofuran T=-10°C; Grignard reaction; 1 h; 3: in tetrahydrofuran Cyclization; 12 h; Heating; Further stages.;

1: 1,3-dihydro-isobenzofuran With n-butyllithium; 2-(dimethylamino)-ethanol in hexane T=-15°C; 0.333333 h; 2: 2-iodo-propane in tetrahydrofuran T=-78°C;

in N,N,N',N',N'',N''-hexamethylphosphoric triamide T=220°C; reaction of benzenedimethanol derivatives; Product distribution;