Studies in vitamin A. 20. Some properties of retinene2

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Abstract
Retinene2 with aliphatic amines forms spectroscopic analogs of acid and alkaline indicator yellow2. With aromatic amines it forms compounds which after acidification exhibit a new broad band with [lambda] max. 560 m[mu]. Retinene2 reacts with concentrated sulfuric acid to give colored unstable products with absorption peaks near 570, 525 and 470 m[mu]. The bearing of these results on the chemistry of vision is discussed briefly.
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