69915-28-2Relevant articles and documents
1,9-Disubstituted phenalenes-I. Synthesis of n- and s-derivatives of 9-hydroxy-1-phenalenone
Franz,Martin
, p. 2147 - 2151 (2007/10/06)
The reaction of 9-hydroxy-1-phenalenone with Ag2O and alkyliodides gives the analogous β-keto-ethers from which synthetic pathways have been devised to isolate and characterise some nitrogen and sulphur derivatives. As intermediates stable phenalenium cations can be isolated by the reaction of 9-substituted 1-phenalenones with [(C2H5)3O]+BF4-. Whenever possible, a strong intramolecular H-bond is formed between the 1-and 9-substituents as shown by the low-field resonances of the respective hydrogens in the 1H NMR and the stability of the compounds towards reduction.