Access to a Stable Si2N2 Four-Membered Ring with Non-Kekulé Singlet Biradical Character from a Disilyne Takeuchi, Katsuhiko ; Ichinohe, Masaaki ; Sekiguchi, Akira Abstract Publication: Journal of the American Chemical Society Pub Date: August 2011 DOI: 10.1021/ja2059846 Bibcode: 2011JAChS.13312478T