Ramazani, A.; Ahmadi, E.; Noshiranzadeh, N. Stereoselective Synthesis of Dialkyl 1,1-Diacetyl-8a-Hydroxy-8-Oxo-1,2,8,8atetrahydrocyclopenta[ a]indene-2,3-Dicarboxylates from the Reaction of Dialkyl 2-(1-Acetyl-2- Oxopropyl)-3-(tributylphosphoranylidene) Succinates With Indene-1,2,3-Trione. ajc 2010, 18, 704-706.