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Benzo dithiolium tetrafluoroborate

These methods are now easy to apply. 4-Methylbenzene-1,2-dithiol is a commercial product and benzene-1,2-dithiol is conveniently prepared by reacting anthranilic acid with isopentyl nitrite in the presence of carbon disulfide. 2-Isopentyloxy-l,3-benzodithiole thus obtained, treated by the tetrafluoroboric/ether complex gives, in 65-70% yield, 1,3-benzo-dithiolium tetrafluoroborate, which is easily cleaved by sodium in liquid ammonia, giving benzene-1,2-dithiol in 80-85% yield (Scheme 11) ... [Pg.200]

Tlie starting material for this Wittig-Horner-like olefination was easily accessible by reaction of benzo-l,3-dithiolium-tetrafluoroborate with trimethylphosphite in the presence of an equimolar amount of sodium iodide in dry acetonitrile under nitrogen at room temperature (93% yield). [Pg.125]

Benzo derivatives, such as the benzo[l,3]dithiolium tetrafluoroborate 35 <2004JME5265>, are also known. For polycyclic systems that are isoconjugate with dianions, neutral rings with two oxygen/sulfur atoms, such as the cyclopenta[l,2]dithiole 36 , can be made. The occurrence of bicyclic systems with a bridgehead sulfur, such as the trithiapentalenes 37, should also be noted <1971AHC(13)161>. [Pg.143]


See other pages where Benzo dithiolium tetrafluoroborate is mentioned: [Pg.477]    [Pg.510]    [Pg.119]    [Pg.119]    [Pg.119]   
See also in sourсe #XX -- [ Pg.143 ]




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