methenyln.

1867 A. W. Hofmann in Proc. Royal Soc. 1866–7 15 58 According to this principle the following names are formed:..Methane, (C H₄)⁰. Methyl, (C H₃)′. Methene, (C H₂)″. Methenyl, (C H)‴.

1868 H. B. Jones & H. Watts Fownes's Man. Elem. Chem. (ed. 10) 557 Methenyl chloride (chloroform).

1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) Introd. 22 Such radicals may be mono-, di-, or trivalent, &c.,..for instance, (C₂H₄)″ is divalent; (C₃H₅)‴, glyceryl, trivalent; (CH)‴, methine, or methenyl, likewise trivalent.

1981 Jrnl. Medicinal Chem. 24 1254 The latter was characterized by conversion to the methenyl analogue.

1991 Lancet 21 Dec. 1551/1 Single carbon units enter the pathway, mostly as methenyl groups derived from the oxidation of serine.

1998 Solid State Nucl. Magn. Resonance 12 31 Subspectra of quaternary carbon C, methenyl CH, methylene CH2 and methyl CH3 for Australian pine leaves have been obtained.