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CarobnjaK
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[*] posted on 23-3-2018 at 03:30
Br-[7]-Helicene-synthesis

hey, what is the mechnanism of this cyclisation reaction and what is the role of Br? thx




[Edited on 23-3-2018 by CarobnjaK]

[Edited on 23-3-2018 by CarobnjaK]

[Edited on 23-3-2018 by CarobnjaK]

[Edited on 23-3-2018 by CarobnjaK]

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[*] posted on 23-3-2018 at 08:31


Br does not play a role, there could be any other substituent in this position (e.g. H, CH3, Cl, COOR, CN etc.). Iodine works as a dehydrogenating agent.
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CarobnjaK
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[*] posted on 23-3-2018 at 08:39


thx, so first photocyclisation and than dehydrogenation, is this position stronger in reactivity than other positions in product ?
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Nicodem
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