in petroleum ether addn. of azo compd. to Fe-compd. in petroleum ether (-30°C), standing at room temp. (24 h); filtn., concn. and chromy. on silica gel, elution with petroleum ether gives traces of Fe3(CO)12 and triiron compd., then elution with petroleum ether/CH2Cl2 gives semidine complex;

in hexane Irradiation (UV/VIS); soln. of Fe(CO)5 and cis-C8H14 irradiated at -35°C for 24 h, cis-azobenzene added, stirred and warmed to room temp. in 24 h; filtered, volume reduced under vacuo, chromd. (silicagel, hexane);

methanol; (methoxy(methyl)carbene)pentacarbonylchromium(0) 1.) hexane, r.t., 2.5 h, 2.) r.t., 14 h; Yield given. Multistep reaction. Yields of byproduct given;

(methoxy(methyl)carbene)pentacarbonylchromium(0) 1.) hexane, r.t., 2 h, 2.) irradiation, 18 h; Yield given. Multistep reaction;

1.) toluene, -40 deg C, 1 h, 2.) CDCl3, RT, 3 h; Yield given. Multistep reaction. Yields of byproduct given;

1.) CDCl3, -78 deg C, 2.) CDCl3, RT, 48 h; Yield given. Multistep reaction. Yields of byproduct given;