allylenen.

1861 London, Edinb. & Dublin Philos. Mag. 4th Ser. 21 359 Sawitsch has subsequently examined the action of monobrominated propylene on ethylate of sodium, and has obtained a second member of the series, allylene, C³H⁴.

1863 H. Watts Dict. Chem. I. 112 Pure allylene, a colourless gas, having an unpleasant odour, burning with a smoky flame.

1921 Jrnl. Amer. Chem. Soc. 43 1227 The disappearance of the blue color shows the formation of sodium acetylide; subsequent addition of methyl iodide brings about the formation of allylene.

1965 C. S. G. Phillips & R. J. P. Williams Inorg. Chem. I. xvii. 612 A magnesium carbide Mg₂C₃ is said to give largely allylene..on hydrolysis.

2009 Photochem. 38 126 The probabilities of transitions between the states of allene and allylene in the process of the photochemical reaction have been calculated.

1889 Jrnl. Chem. Soc. 56 Abstracts 840 The author's [sc. A. Béhal's] attempts to prepare allylene, CH₂:C:CH₂..were unsuccessful.

1921 E. Thorpe Dict. Appl. Chem. (rev. ed.) I. 150/2 Two allylenes are possible and known: symmetrical allylene CH₂:C:CH₂, and unsymmetrical allylene CH₃·C⋮CH.

1968 A. A. Baker Unsaturation in Org. Chem. vii. 88 For a number of years there was a great deal of confusion surrounding the name allylene. Some chemists used it..in describing propadiene, but others used it synonymously with propyne and were convinced that propadiene, which they called allene, did not exist.