4, 4'-Bi (cyclobutene-1, 2-diones): bisquaryls

LS Liebeskind, MS Yu, RH Yu, J Wang…

Index: Liebeskind, Lanny S.; Yu, Marvin S.; Yu, Richard H.; Wang, Jianying; Hagen, Karl S. Journal of the American Chemical Society, 1993 , vol. 115, # 20 p. 9048 - 9055

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Citation Number: 54

Abstract

Abstract: 4, 4'-Bi (cyclobutene-1, 2-diones), novel compounds derived from squaric acid, here named bisquaryls, were prepared for the first time either by the palladium-catalyzed oxidative dimerization of (tri-n-butylstanny1) cyclobutene-1, 2-diones (providing symmetrically substituted bisquaryls) or by a palladium4opper cocatalyzed cross-coupling of 3-substituted-4-(tri-n-butylstannyl)-3-cyclobutene-1, 2-diones with 3-halo-4-substituted-3- ...