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Synthesis of alkyl substituted cyclobutenediones by free radical chemistry. Carbon for nitrogen replacement in the α-Amino acid Bioisostere -- 34-Diamino-3-cyclobutene-1,2-dione.William A. Kinney · 1993
A new process for the regiocontrolled synthesis of substituted catechols and other 1,2-dioxygenated aromatics: conjugate addition of vinyl-, aryl-, and heteroarylcopper reagents to cyclobutenediones followed by thermal rearrangementGurski, Angela; Liebskind, Lanny S. · Journal of the American Chemical Society · 1993
4,4'-Bi(cyclobutene-1,2-diones): bisquarylsLiebeskind, Lanny S.; Yu, Marvin S.; Yu, Richard H.; Wang, Jianying; Hagen, Karl S. · Journal of the American Chemical Society · 1993