Azulene moiety as electron reservoir inin positively charged systems; a short survey

Abstract

The non-alternant aromatic azulene, an isomer of alternant naphthalene, differs from the latter in peculiar properties. The large polarization of the π-electron system over the seven and five rings gives to azulene electrophile propertyaa pronounced tendencytotodonatedonateelectronselectronstotoananacceptor,accep-tor, substitutedsubstitutedat azuleneat azulene1 position.1 position.ThisThispaperpaperpresentspresentscasescasesin whichin whichazuleneazulenetransferstransferselectronselectronsto toa suitablea suitableacceptoracceptorasas methyliumions,ions, positive charged heteroaromatics and examples of neutral molecules that can accept electrons. The proposed product synthesis was outlined and the expected electron transfer was highlighted by analyzing the NMR, UV-Vis spectra and the pKR+R values.