A conjugated polymer with a butatriene segment in the main chain, poly(biphenyl-4,4'-diyl-1,4-bis(4-dodecyloxyphenyl)buta-1,2,3-triene-1,4-diyl), was synthesized from 1,4-bis(4-bromophenyl)-1,4-bis(4-dode-cyloxyphenyl)buta-1,2,3-triene by dehalogenative poly-codensation using Ni(cod)(2). The polymer was well soluble in usual organic solvents such as CHCl3 and THE Structural analyses and characterizations were carried out by IR, NMR, UV-Vis, PL, and Raman spectroscopy, as well as electrical conductivity. it is suggested that pi -conjugation is extended to some degree through biphenylylene and butatrienylene linkages.