Keywords: Ph3P=CH2-ylid-phosphorane-resonance-2D.png Resonance structures of the methylenetriphenylphosphorane molecule Ph<sub>3</sub>P CH<sub>2</sub> Structure drawn in http //www cambridgesoft com/software/details/ ds 2 dsv 73 ChemDraw Ultra 11 0 Own 2009-05-21 Ben Mills Benjah-bmm27 Images by Ben Mills Mesomerism Phosphorus ylides |