Tetrahedron p. 4177 - 4184 (1987)
Update date:2022-08-04
Topics:
Johnston, D.S.
Tyman, J.H.P.
Chapman, D.
The interaction of equimolar proportions of retinal with indoles under acidic conditions yields primarily 1:1 blue purple pigments which are retinylidene indolenines or retinylidene (3H) indolium salts reducible to retinylidene indoles with sodium borohydride.With 3-substituted indoles, reaction is considered to occur at the 2-position and at the 3-position with indole and 2-substituted indoles, the latter series being more stable and readily formed.
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(1989)
