in benzene byproducts: tetraphenylcyclopentadienone; Ar-atmosphere; heating Cr-complex with 2 equiv. of PhC2Ph for 12 h; evapn., chromy. (SiO2, petroleum ether/EtOAc=19:1, then 4:1); elem. anal.;
参考文献
Journal of Organometallic Chemistry, , vol. 567, # 1-2 p. 83 - 100