By the McMurry reaction

Top S, Dauer B, Vaissermann J, Jaouen G (1997) Facile route to ferrocifen, 1-[4-(2-dimethy-laminoethoxy)]-l(phenyl-2-ferrocenyl-but-l-ene), first organometallic analogue of tamoxifen, by the McMurry reaction. J Organomet Chem 541 355-361... 

From a synthetic point of view, the titanium-induced mframolecular cyclization of dicarbonyl compounds is especially attractive in that carbocyclic rings of all sizes may be prepared in good yields, competitive with those obtained using the Dieckmann and acyloin cyclization methods. The synthesis of medium- and large-ring cycloalkenes by the McMurry reaction requires high-dilution conditions (< 0.0 IM) to repress intermol-ecular polymerization. ... 

McMurry reaction. Substituted phenanthrenes have been synthesized from 2,2 -diformylbiaryls by the McMurry reaction. 

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