New photochromic 1,1,3-trimethylspiro[benzo[e]indoline-2,3′-[3H]-pyrano[3,2-f]quinoline]
✍ Scribed by S. M. Aldoshin; V. V. Tkachev; K. N. Khalanskii; B. S. Lukyanov; V. I. Minkin; A. N. Utenyshev; Yu. S. Alekseenko; S. O. Bezuglyi
- Book ID
- 113079151
- Publisher
- Springer
- Year
- 2011
- Tongue
- English
- Weight
- 210 KB
- Volume
- 60
- Category
- Article
- ISSN
- 1573-9171
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Resonance Raman spectra of transient species of 1 ',3',3'-trimethylspiro-[2H-l-benzopyran-2,2'-indoline] in various solvents reveal that at least four transients having merocyanine-like structures are involved in the photochromism of this compound. It is concluded that the transient species in aliph
## Abstract 2‐Methyl‐3__H__‐indoles 1 cyclize with two equivalents of ethyl malonate **2** to form 4‐hydroxy‐11__H__‐benzo[__b__]pyrano[3,2‐__f__]indolizin‐2,5‐diones 3, whereas 2‐mefhyl‐2,3‐dihydro‐1__H__‐indoles **9** give under similar conditions regioisomer 8‐hydroxy‐5‐methyl‐4,5‐dihydro‐pyrrol