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Synthesis of Butenolides via Transition Metal2 Catalyzed Cyclization Reaction of 2 ,32Allenoic Acids
Ma Shengming, Yu Zhanqian
中国科学院大学学报 . 2005, (1): 110 -121 .  DOI: 10.7523/j.issn.2095-6134.2005.1.018