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Preparation and Structural Properties of 7,8-Dioxa[6]helicenes and 7a,14c-Dihydro-7,8-dioxa[6]helicenes

✍ Scribed by Eskildsen, Jørgen; Krebs, Frederik C.; Faldt, André; Sommer-Larsen, Peter; Bechgaard, Klaus

Book ID
120763404
Publisher
American Chemical Society
Year
2001
Tongue
English
Weight
114 KB
Volume
66
Category
Article
ISSN
0022-3263

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Thermal racemisation of [6], [7], [8] an
Thermal racemisation of [6], [7], [8] and [9] helicene.
✍ R.H. Martin; Marie-Jeanne Marchant 📂 Article 📅 1972 🏛 Elsevier Science 🌐 French ⚖ 114 KB

Wi wish to report that [6], 171, [8] and [S]helicene undergo thermal racemisatlon when heated, in evacuated sealed tubes, slightly above the melting points of the respective pure antipodes b). [9]Helicene [a]57g-14300 is thus completely racemised in 10 minutes at 380'. Pure optically inactive [9]hel