ChemInform Abstract: La(OTf)3‐Catalyzed, Three‐Component Synthesis of Spiro[Indolo‐3, 10′‐indeno[1, 2‐b]quinolin]‐2, 4, 11′‐triones in PEG‐400 under Conventional Heating and Ultrasonic Irradiation. Issue 31 (14th July 2016)