Benzocyclobutenoacenaphthylene Stilbenes. 1. Synthesis and Thermal Properties
摘要:
In this paper the synthesis and characterization of a new class of molecules based an 6b,10b-dihydroobenzo[j]cyclobut[a]acenaphthylene (DBCA) with potentially interesting optical and electronic properties are described. The mentioned compounds contain one or two DBCA units linked via a double bond to an aromatic system. The synthesis of these compounds is mainly carried out by Heck and/or Wittig reactions. The introduction of DBCA units in molecules is interesting in two respects: (1) It will influence the electronic and optical properties of the compounds, and (2) it will induce dimerization (polymerization) because DBCA can, upon thermolysis or photolysis, be converted into a biradicaloid species ("pleiadene") which dimerizes. Thus suitable compounds could be used as monomers for photochemically or thermally induced polymerization.