> as lemmas

1868 H. B. Jones & H. Watts Fownes's Man. Elem. Chem. (ed. 10) 655 Ethene oxide is isomeric with aldehyde and with vinyl alcohol.

1930 D. L. Sayers & ‘R. Eustace’ Documents in Case li. 254 You can make it by heating ethene oxide with triethylamine. That gives you your cholin.

1995 P. M. Treichel in E. W. Abel et al. Comprehensive Organometallic Chem. II VI. i. 15 Preparation of carbene complexes..by the reaction of ethene oxide and aziridine at a coordinated carbonyl group is noted.