High pressure synthesis of sulfur-selenium fulvalenes
AssigneeKoppers Company, Inc.
InventorsYoshiyuki Okamoto, Piotr S. Wojciechowski
Life of this patent
Estimating the term…
Abstract
A process is disclosed for one-step preparation of sulfur-selenium fulvalenes by reaction of an acetylenic compound with carbon selenide sulfide or with a mixture of carbon diselenide and carbon disulfide under pressures of at least about 1,000 atmospheres. Fulvalene compounds made by the process are characterized in having at least one sulfur atom and at least one selenium atom in the ring structure of the fulvalene compound. Substituted diselenadithiafulvalenes made by this process are precursors to very pure diselenadithiafulvalene which is useful in preparing charge-transfer salts.
Claims12
A process for preparing a fulvalene compound, said process comprising the step of subjecting a mixture of reactants to a pressure of at least about 1,000 atmospheres, for a time and at a temperature sufficient to form said fulvalene compound, said mixture of reactants comprising at least one compound selected from a first group consisting of carbon disulfide, carbon diselenide and carbon selenide sulfide, and said mixture of reactants comprising at least one compound selected from a second group consisting of compounds containing an acetylenic moiety of the general formula
- ZC.tbd.CZ
- wherein the Z substituents may be the same or different and are selected from the set consisting of the following members:
- ##STR12## wherein R is selected from hydrogen and alkyl, aryl and alkaryl groups of up to about 12 carbon atoms;
- with the proviso that at least one of the Z substituents is an electron withdrawing group, with the further proviso that said mixture of reactants comprises one or more compounds selected from said first group such that both sulfide and selenide atoms are contained within the ring structure of a fulvalene compound prepared from said mixture of reactants.
Dependencies are inferred from the claim text.