Synthesis of photochromic benzopyrans annulated by 15(18)-crown-5(6) ether
β Scribed by S. V. Paramonov; O. A. Fedorova; V. P. Perevalov; V. Lokshin; V. Khodorkovsky
- Book ID
- 106521062
- Publisher
- Springer
- Year
- 2008
- Tongue
- English
- Weight
- 310 KB
- Volume
- 57
- Category
- Article
- ISSN
- 1573-9171
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Photochromism / Photoresponsive crown ether Photosensitive crown ether 1 composed of 1,8a-dihydroazulene as a photodynamic unit and a benzo[l5]crown-5 ether subgroup has been synthesized from C-Tsubstituted cycloheptatriene 8, which has been obtained by nucleophilic addition of 4-acetylbenzo[l5]crow
Complexes between the heavier lanthanoid nitrates Ln(NO~3~)~3~ and 15βcrownβ5 (**1**) and 18βcrownβ6 (**2**) ethers were isolated and characterized. Both 1:1 and 4:3 complexes are formed with each Ln(III) ion, except in the case of Gd and **2**. The thermal transformation of the 1:1 complexes into t