Thermochromic effect in distibines. The role of conjugation

Article abstract of DOI:10.1021/om00149a009

The thermochromic 2,2′,5,5prime;-tetrakis(methylene)bistibolane (3) and 2,2prime;,5,5prime;-tetrakis(methylene)bibismolane (4) were prepared by multistep syntheses from 2,5-dibromohexa-1,5-diene. The band structure of 3 and the related 2,2prime;,5,5prime;