oxa-
Also before vowels ox-.
Combining element in systematic chemical names used to denote the presence of an oxygen atom (regarded as replacing a {b1}CH2{b1} group), as in 6-oxa-3-thiadecanenitrile, 1H-2-oxapyrene, oxirane, oxolane.
| 1928 Jrnl. Amer. Chem. Soc. L. 3075 In order to avoid confusion with the ordinary meanings of oxy-, thio-, azo-, etc., it is recommended that the forms oxa-, thia-, aza-, etc., be employed to indicate the presence of hetero atoms in a ring (the a being dropped before a vowel). 1971 Nomencl. Org. Chem. (I.U.P.A.C.) (ed. 3) B. 53 (table) Element Oxygen..Prefix Oxa. |