All-cis-1,6-dichlorocyclodeca-1,3,6,8-tetraene and all-cis-1-chlorocyclodeca-1,3,8-trien-6-yne, derivatives of dihydro-[10]annulene
✍ Scribed by Klaus Grohmann; Franz Sondheimer
- Publisher
- Elsevier Science
- Year
- 1967
- Tongue
- French
- Weight
- 282 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0040-4039
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## Abstract The stereochemistry of __trans__‐ and __cis__‐2, 4‐dimethyl‐tetrahydroquinolines, **6** and **7** were derived from ^1^H‐NMR. studies. These were converted respectively into __trans__‐ and __cis__‐5, 6‐dihydro‐4, 6‐dimethyl‐4__H__, 8__H__‐pyrido [3, 2, 1‐de]phenanthridin‐8‐ones **18** a
Fifteen title compounds, e.g. (I)-(III), are prepared essentially as described previously. Evaluation of their absorption, emission and laser properties shows that N-allyl substituted derivatives (Ia) and (IIa) have high fluorescence quantum yields and laser efficiencies of 137 and 140%, respectivel