e.g. Filippa Pettersson or Cancer Res. 75(6) , 1102-12, (2015) or 10.1002/anie.201600521
… -Fused Dihydrobenzocyclobutene-1, 2-diones and Benzocyclobutene-1, 2-diones via Annulation of 1, 2-Bis (methylene) carbocycles with 3-Chloro-3-cyclobutene-1, 2 …
AH Schmidt, G Kircher, M Willems
Index: Brown, Roger F. C.; Coulston, Karen J.; Eastwood, Frank W.; Saminathan, Sugirtham Australian Journal of Chemistry, 1987 , vol. 40, # 1 p. 107 - 120