A Divergent Method for Preparing 1-Aryl- and 1,3-Diarylazulenes from Ethyl 3-(Cyclohepta-1,3,5-trien-1-yl)-3-oxopropionate - Oda, Mitsunori; Kajioka, Takanori; Haramoto, Kanae; Miyatake, Ryuta; Kuroda, Shigeyasu (Synthesis, 1999)