THE SYNTHESIS OF 2-HYDROXY-3H-CYCLOHEPT[a]AZULEN-3-ONE (AZULENO[2,1-d]TROPOLONE) AND ITS METHYL ETHERS
- 5 May 1975
- journal article
- Published by Oxford University Press (OUP) in Chemistry Letters
- Vol. 4 (5) , 441-444
- https://doi.org/10.1246/cl.1975.441
Abstract
2-Hydroxy-3H-cyclohept[a]azulen-3-one (azuleno[2,1-d]tropolone) (2) was synthesized, starting from 1,2-diformylazulene (3). Methylation of 2 yielded two kinds of methyl ethers (4 and 6), differing from benzotropolones. In trifluoroacetic or dil. sulfuric acid, 2, 4 and 6 exist in cyclohept[a]azulenylium ions (2a, 4a and 6a).This publication has 1 reference indexed in Scilit:
- THE SYNTHESIS AND SOME PROPERTIES OF 3H-CYCLOHEPT[a]AZULEN-3-ONEChemistry Letters, 1974