Novel .pi.-extended thiophene-fused electron acceptors for organic metals
作者:Pilar De la Cruz、Nazario Martin、Fuencisla Miguel、Carlos Seoane、Armando Albert、Felix H. Cano、Araceli Gonzalez、Jose M. Pingarron
DOI:10.1021/jo00049a027
日期:1992.11
Novel pi-extended thiophene-fused TCNQ-type and DCNQI-type acceptors have been synthesized from the corresponding quinones by reaction with Lehnert's reagent and bis(trimethylsilyl)carbodiimide (BTC), respectively. Additionally, an example of the little-known hybrid TCNQ-DCNQI-type acceptor has also been obtained. The cyclic voltammetric data of the novel acceptors reveal two different behaviors for these molecules. The TCNQ-type derivatives exhibit a two-electron single-wave reduction to the dianion, as confirmed by controlled potential coulometry analysis. The DCNQI-type derivatives display two reduction waves to the corresponding radical anion and dianion. The same behavior is shown by the hybrid TCNQ-DCNQI derivative. The acceptor ability is related to molecular planarity, and a comparative crystallographic study involving TCNQ-type and DCNQI-type derivatives (6a, 7a, and 8a) has been performed.
Microwave assisted synthesis of heterocyclic fused quinones in dry media
作者:A. Acosta、P. de la Cruz、P. De Miguel、E. Diez-Barra、A. de la Hoz、F. Langa、A. Loupy、M. Majdoub、N. Martín、C. Sanchez、C. Seoane
DOI:10.1016/0040-4039(95)00202-n
日期:1995.3
in dry media is studied. Some clays were tested and Montmorillonite K-10, free of quarz and feldspar, was shown to be an effective catalyst for their easy conversion into the corresponding heterocyclic fused quinone in good yields. A specific effect of microwave irradiation accelerating the reaction with respect to conventional heating in the same conditions is observed.