Financial supports from Woosuk Univ. as well as LINC program funded by Korean Ministry of Education, Science and Technology in 2013 are gratefully acknowledged.
 and K Lee , “S-[3-Cyano-2-oxo-3-(triphenyl-λ5-phosphanylidene)propyl] O-ethyl Carbonodithioate: A Novel Xanthate Reagent for the Synthesis of α-keto (cyanomethylene)triphenylphosphorane Ylides from Olefins”, Bulletin of the Korean Chemical Society, vol. 12, no. 12, Dec 2013.