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Spiro[4H-chromene-4,5′-isoxazolines] and Related Compounds: Synthesis and Reactivities.

✍ Scribed by V. Ya. Sosnovskikh; A. Yu. Sizov; B. I. Usachev; M. I. Kodess; V. A. Anufriev

Publisher: John Wiley and Sons
Year: 2006
Weight: 36 KB
Volume: 37
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.200652144

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## Abstract magnified image __Racemic__ thioflavanone (thio)acylhydrazones undergo transformation into __racemic__ 3‐acetylspiro[1,3,4‐oxa(thia)‐diazoline‐2,4′‐thioflavans] with __trans__ O(1) or S(1) and Ph(2′eq) under acetylating conditions. Conjugation between the ethylenic bond and sp^2^ C(4)