The reaction of 2-(2-oxoindolin-3-yl)glyoxylates with acetic anhydride in the presence of pyridine gives insoluble purple pigments in which two molecules of the indoline have condensed with one molecule of acetic anhydride and for which a spirocyclobutene structure (13a) is suggested. The mode of formation of the pigments is discussed.
J. A. Ballantine, M. Alam and G. W. Fishlock, J. Chem. Soc., Perkin Trans. 1, 1977, 1781 DOI: 10.1039/P19770001781
To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.
If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.
If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.
Read more about how to correctly acknowledge RSC content.
Please wait while we load your content...