1: octyne-4 With n-butyllithium; zirconocene dichloride in tetrahydrofuran; hexane T=-78 - 0°C; 2: oxalyl dichloride With N,N'-dimethyl-N,N'-propyleneurea; copper(l) chloride T=0°C; 0.5 h;

1: (4Z,6Z)-5,6-dipropyl-4,7-diiododeca-4,6-diene With tert.-butyl lithium in diethyl ether; pentane T=-78°C; 1 h; 2: With copper(l) chloride in diethyl ether; pentane T=-78°C; 0.5 h; 3: carbon monoxide With di-tert-butyl peroxide in diethyl ether; pentane T=0°C; P=760.051 Torr; 1 h; Further stages.;

1: (4Z,6Z)-5,6-dipropyl-4,7-diiododeca-4,6-diene With tert.-butyl lithium in tetrahydrofuran T=-78°C; 1 h; 2: carbon dioxide T=-30°C; 0.0833333 h; Further stages.;

1: (4Z,6Z)-4,7-Dibromo-5,6-dipropyl-deca-4,6-diene With magnesium; ethylene dibromide in tetrahydrofuran T=60°C; 8 h; 2: carbon dioxide in tetrahydrofuran T=20°C; 1 h;

triphenylphosphine in hexane under N2, Schlenk tube technique; stirred for 2 h; ppt. filtered off, washed with hexane, dried, resulting compd. identified as Pt(PPH3)2Cl2; hexane soln. dried in a rotary evaporator, resulting solid identified as tetrapropylcyclopentadienone derivative;

1: octyne-4 With n-butyllithium; (C5H5)ZrCl2 in tetrahydrofuran T=-78 - 20°C; 3 h; 2: carbon monoxide in tetrahydrofuran T=50°C; 12 h;

bis(1,5-cyclooctadiene)nickel (0) 1) THF, reflux; 2) 6N-HCl; Multistep reaction;