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As Grasso Luigi mentioned on the page of the figure itself: the orbital structure of the singlet Fluorenylidene is drawn in a misleading way. It looks like sp-hybridization, even though the singlet carbene has a sp2-hybridization (trigonal planar structure). It would be more precise to draw only the lobe with the electron pair, pointing upward. I also recommend writing the hybridization type of the respective carbenes next to it, so it is absolutely obvious with only one glance which orbital structure both carbenes have. GenericForce (talk) 21:47, 9 December 2018 (UTC)