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Beilstein J. Org. Chem. 2020, 16, 674–680, doi:10.3762/bjoc.16.65
Graphical Abstract
Figure 1: Examples of liquid crystal candidates with negative values for dielectric anisotropy (Δε) [6-10].
Figure 2: Synthetic candidate LC targets 8–11.
Scheme 1: Synthesis of 8. Reagents and conditions: a) TMSCF3, NaI, THF, reflux, 55% [13,14].
Scheme 2: Synthesis of 9. Reagents and conditions: a) NBS, HF·Py, DCM; b) t-BuOK, DCM, 42% in two steps [15]; c) ...
Scheme 3: Synthesis of compound 10. Reagents and conditions: a) NaBH4, MeOH, rt, 45%; b) C4H9OCH=CH2, Pd(TFA)2...
Scheme 4: Synthesis of compounds 11. Reagents and conditions: a) PPh3CH3Br, t-BuOK, diethyl ether, 0 °C to rt...
Figure 3: Theory study exploring the relative energies for different conformers of 11a.