1: (1-dibromomethylene-prop-2-ynyl)-benzene With n-butyllithium in hexane; toluene T=-40 - -20°C; Fritsch-Buttenberg-Wiechell rearrangement; 2: With zinc(II) chloride in tetrahydrofuran; hexane; toluene T=-40 - 0°C; 3: 1,3-diiodobenzene With tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran; hexane; toluene T=70°C; Negishi coupling; 20 h; Further stages.;

1: (1-dibromomethylene-prop-2-ynyl)-benzene With n-butyllithium in hexane; toluene T=-20 - 0°C; Fritsch-Buttenberg-Wiechell rearrangement; 2: methyl iodide in diethyl ether; hexane; toluene T=-20 - 20°C; Further stages.;

1: (1-dibromomethylene-prop-2-ynyl)-benzene With n-butyllithium in hexane; water; toluene T=-20 - 0°C; Fritsch-Buttenberg-Wiechell rearrangement; 2: methyl iodide in various solvents T=-20 - 20°C; Further stages.;