transannularadj.
Chemistry.
Situated, existing, or occurring between non-adjacent atoms forming a ring.
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transannular1926
1926 de Barry Barnett & Matthews in Berichte der Deutsch. Chem. Ges. 59 1429 Es dürfte deshalb angezeigt sein, diese besondere Art tautomerer Umwandlungen unter dem allgemeinen Begriff ‘Transannular-Tautomerie’ zusammenzufassen.]
1926 Chem. Abstr. 20 3003 The name ‘trans-annular tautomerism’ is suggested for those cases..where the H migrates across the ring.
1941 Nature 21 June 776/1 As the carbon atoms concerned..are components of a cyclic system.., the resulting tautomeric change would be a transannular one and involve the formation of a bridge linkage from C3 to C5.
1978 Further Perspectives Org. Chem. (CIBA Symposium) 119 This reaction undoubtedly involves fission of the transannular bond.
This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2019).
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adj.1926