- New spirans containing a 1,5-benzodithiepine system, derived from methylbenzenes. Conformational transmission
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A synthesis of three new spirans, derived from methylbenzenes, containing the 1,5-benzodithiepine system is reported. X-ray structure proved the identity of model monospiran 9. In the solid and liquid state, the conformation of the seven-membered ring is chair, and the five-membered ring has the envelope conformation. The effect of conformational transmission in spirans 9 and 10 was observed. The synthesis of trispirans from hexamethylbenzene using the proposed scheme is also possible.
- Baranska, Joanna,Grochowski, Jacek,Jamrozik, Janusz,Serda, Pawel
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p. 425 - 427
(2007/10/03)
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- Structure and Reactivity of Isoannellated Heterocyclic Systems with 4n?- and (4n+2)?-Electrons, XIV. Tri- and Tetracyclic Hetarenes with Localized or Delocalized Pyrrole Units
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2,7-Di-tert-butyl-2,7-dihydro-benzodipyrrole (2b) and 2,5,8-Tri-tert-butyl-5,8-dihydro-2H-benzotripyrrole (3b) have been prepared by acetolysis of the corresponding tri- and tetracyclic N-oxides, isolated in crystallinic form and characterized by spectroscopic data.The scope of the N-oxide route is documented and the existence of benzo-annellated pyrroles is proofed.The stabilizing effect of the tert-butyl group is presumably supported by the vicinal annellated heterocycles. - Keywords: Benzo-annellated Di- and Tripyrroles, Synthesis, Isolation, Spectroscopic Properties, Cycloaddition reactions
- Kreher, Richard P.,Hildebrand, Thomas
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p. 125 - 131
(2007/10/02)
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