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[13] Helicene and [13] helicene-10,21-d2

✍ Scribed by R.H. Martin; G. Morren; J.J. Schurter

Publisher
Elsevier Science
Year
1969
Tongue
French
Weight
189 KB
Volume
10
Category
Article
ISSN
0040-4039

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✦ Synopsis

Tridecahelicene, the first benzologue of the multilayered helicenes, has been synthe$ised, in 52 % yield, by the double photocyclisation of IVa .

The cyclodehydrogenation of IVa, involving the loss of 4 hydrogens, can give rise to no less than 12 isomers, if cyclisations of intermediate pentahelicenic structures to perylene systems are considered (2) . In order to discard 9 of these possibilities, including all the perylene structures, we have app-

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