Preparation and chemistry of new unsymmetrically substituted tetrachalcogenofulvalenes bearing CN(CH2)2X and HO(CH2)2X groups (X = S or Se)
作者:Laurent Binet、Jean Marc Fabre、Claude Montginoul、Klaus Baek Simonsen、Jan Becher
DOI:10.1039/p19960000783
日期:——
Several unsymmetrically substituted TTFs bearing the S(CH2)2CN protecting group have been prepared by standard cross coupling in triethyl phosphite from the key intermediate 4,5-bis(2′-cyanoethylsulfanyl)1,3-dithiol-2-one 1 and an appropriate 1,3-dichalcogenole-2-chalcogenone, 2–8. TTFs 10, 11 and 12 of type I have been obtained in satisfactory yields (30–60%) and those (13,14) of type II in low yields (10 and 19%) as a result of differences in the reactivity of the species involved.Pseudo-Wittig condensations from the key triphenylphosphonium salt 15 have allowed considerable improvement in the synthesis of 13 (70% yield) and 14 (57% yield).The diselena analogue of 1, 21 has also been obtained. Its derivative 22, a new tetrakis(alkylselena) functionalised TTF, has been isolated in fair yield (69%). Its deprotection in a basic medium followed by a subsequent alkylation has led to BEDSe-TTF 23 (40%). Finally, the same sequence of deprotectionrealkylation carried out from unsymmetric species 10 and 12 has successfully been used in a high yield preparation of the corresponding new functionalised TTFs bearing two hydroxyethyl groups.
New unsymmetrical dithiadiselenafulvalene donors and their radical cation salts with inorganic anions have been prepared; among the salts dimethyl(ethylenedithio)dithiadiselenafulvalene salts exhibit the highest electrical conductivity.
Synthesis of Pyrazinodithiadiselenafulvalenes. New Unsymmetrical π-Donors
作者:George C. Papavassiliou、Stelios Y. Yiannopoulos、John S. Zambounis、Keiji Kobayashi、Kisaburo Umemoto
DOI:10.1246/cl.1987.1279
日期:1987.7.5
Unsymmetrical dithiadiselenafulvalenes, which are annelated on the 1,3-dithiole or 1,3-dise1enole moiety to a 1,4-pyrazine ring, have been prepared by the cross coupling method and characterized as electron-donors for use in conductive charge-transfer salts.
Synthesis of novel selenium-containing donors as selenium analogues of diiodo(ethylenedithio)diselenadithiafulvalene (DIETS)Electronic supplementary information (ESI) available: Experimental details. See http://www.rsc.org/suppdata/ob/b4/b406092j/
作者:Takashi Shirahata、Tatsuro Imakubo
DOI:10.1039/b406092j
日期:——
Novel selenium analogues of diiodo(ethylenedithio)diselenadithiafulvalene (DIETS) have been successfully derived from 1,3-diselenole-2-thione, which could be synthesized without the use of the highly toxic reagent CSe2.
Molecular Modifications of Methylenedithio-Tetraselenafulvalene (MDT-TSF) and Methylenedithio-Diselenadithiafulvalene (MDT-ST) for Superior Electron Donors
The dimethyl-, bis(methylthio)-, and ethylenedithio-derivatives of methylenedithio-tetraselenafulvalene and methylenedithio-diselenadithiafulvalene have been synthesized as new electron donors. The formation and electrical conductivities of their radical cation salts are examined.