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Knoevenagel condensation and the synthesis of 4H-chromene derivatives catalyzed by K2CO3 under ultrasound irradiation
Yu-cai ZENG,Xiao-ling LIU,Su-zhen YANG,Li-man GUO
China Surfactant Detergent & Cosmetics . 2019, (1): 34 -39 .  DOI: 10.3969/j.issn.1001-1803.2019.01.008