| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5283347 | Tetrahedron Letters | 2008 | 4 Pages |
Abstract
Spiro[1H-azulenium-1,9â²-fluorene] (3) perchlorate was synthesized in five steps starting from fluorenone and trimethylsilyl enol ether of 1-acetylcycloheptatriene. The pKR+ value of 3 was determined to be 7.8. A characteristic absorption band of 3 in acetonitrile was observed at 430Â nm, which shows a bathochromic shift in dichloromethane, indicating the first example of the intramolecular charge-transfer interaction between orthogonally arranged units of an azulenium ion having a tropylium ion ring and fluorene having two benzene rings.
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
![Spiro[1H-azulenium-1,9â²-fluorene] perchlorate. Intramolecular charge-transfer interaction between orthogonally arranged units of the azulenium cation and fluorene](/preview/png/5283347.png "First Page Preview: Spiro[1H-azulenium-1,9â²-fluorene] perchlorate. Intramolecular charge-transfer interaction between orthogonally arranged units of the azulenium cation and fluorene")
Authors
Mitsunori Oda, Nobue Nakajima, Nguyen Chung Thanh, Shigeyasu Kuroda,