Allene C3H4 Dimethylenemethane 1,2-Propadiene C 3 H 4      Real, long lived, electronically neutral reagent chemical. Gram formula weight (molecular mass) = 40.063 Melting point = -136 °C Boiling point = -34 °C Purity = 99 % Solubility in organics = soluble Wikipedia Page: Allene is defined with respect to the entities below: The entities below are defined with respect to: Allene Allene (generic) Cumulene (generic) Molecular material (generic) pi-HOMO Lewis base (generic) chemical compound molecule metal molecular science reaction mechanism ionic material acid base geometry reactivity synthesis science knowledge chemistry Lewis