Bulletin of the Chemical Society of Japan p. 3742 - 3746 (1993)
Update date:2022-08-11
Topics:
Mori
Kubo
Takeshita
Treatment of 2,3-dihydro-4aH-cyclohepta-1,4-dithiin with triphenylmethyl tetrafluoroborate followed by condensation with α-promomalononitrile in pyridine afforded 5- and 7-(dicyanomethylene)-2,3-dihydrocyclohepta-1,4- dithiins in good yields. When changing the solvent to acetonitrile, the products obtained were 5- and 6-(2,2-dicyanoethyl)-2,3-dihydro-1,4- benzodithiins. This new method was applicable to the general synthesis of dicyanoheptafulvenes from tropylium salts.
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