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Hélicènes pontés: Ethano‐3,15‐ et oxa‐2‐propano‐3,15‐[7]hélicène. Synthèse, spectrographie 1 H‐RMN. et étude par diffraction aux rayons X
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Bridged helicenes: 3,15‐ethano‐ and 3,15‐(2‐oxapropano)‐[7]helicene
The title compounds (
35
and
33
, see
Scheme 4
) have been synthesized from a common intermediate: 3,15‐dimethoxycarbonyl‐[7]helicene (
26
). The conformation of the bridged [7]helicenes (X‐ray diffraction) and their
1
H‐NMR. spectra have been compared to the conformation and
1
H‐NMR. spectra of [7]helicene and 3,15‐dimethyl‐[7]helicene (
10
).
Title: Hélicènes pontés: Ethano‐3,15‐ et oxa‐2‐propano‐3,15‐[7]hélicène. Synthèse, spectrographie
1
H‐RMN. et étude par diffraction aux rayons X
Description:
Bridged helicenes: 3,15‐ethano‐ and 3,15‐(2‐oxapropano)‐[7]helicene
The title compounds (
35
and
33
, see
Scheme 4
) have been synthesized from a common intermediate: 3,15‐dimethoxycarbonyl‐[7]helicene (
26
).
The conformation of the bridged [7]helicenes (X‐ray diffraction) and their
1
H‐NMR.
spectra have been compared to the conformation and
1
H‐NMR.
spectra of [7]helicene and 3,15‐dimethyl‐[7]helicene (
10
).
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