We describe mono-substituted helical poly(phenyl)acetylene, a structural variation of polyacetylene that may overcome its problem: the lack of chemical stability. Helical polyacetylene shows an intrinsic stiff rod structure, which can be enhanced by the choice of suitable side groups. The structure looks like a narrow spiral with a conjugated electron system, covered by attached side groups spiralling in the opposite sense. We consider this unique material as a prototype for molecular electronic device use. It provides the electronic function, mechanical packaging and electrical insulation through a variety of side groups and exhibits useful self-assembly properties. We provide evidence that such materials, in many variations, show the expected overall structure, can be synthesized through living polymerization (which is necessary for the fabrication of monomers by monomer controlled structures), do show enhanced chemical stability, are amenable to self-assembly, may be deposited in an oriented fashion and do show electrical conductivity.