Evidence on the role of a methoxy-substituent in directing cyclobutene formation in alkyne–quinone photoadditions is presented which does not support an enhancement of π,π*-character in the reactive state.
S. P. Pappas and N. A. Portnoy, J. Chem. Soc. D, 1970, 1126b DOI: 10.1039/C2970001126B
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