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n-Butyl bromide formed in the halogen-metal exchange reaction with n-BuLi can act as an electrophile and hence it competes with the alkyl bromide (RBr) used for introduction of the alkyl chain. Though this can be avoided by using two equivalents of t-BuLi, using the metallation reaction is more convenient
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n-Butyl bromide formed in the halogen-metal exchange reaction with n-BuLi can act as an electrophile and hence it competes with the alkyl bromide (RBr) used for introduction of the alkyl chain. Though this can be avoided by using two equivalents of t-BuLi, using the metallation reaction is more convenient.
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31
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78049338314
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Whereas the 5-alkylthiophene-2-carboxylic acids do not show LC phases, the dodecyl-2,2′-dithiophene-5-carboxylic acid forms a broad mesomorphic region with an enantiotropic SmC and nematic phase; transitions: Cr 109 SmC 135 N 149 Iso (°C)
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Whereas the 5-alkylthiophene-2-carboxylic acids do not show LC phases, the dodecyl-2,2′-dithiophene-5-carboxylic acid forms a broad mesomorphic region with an enantiotropic SmC and nematic phase; transitions: Cr 109 SmC 135 N 149 Iso (°C).
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42749107281
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46
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78049346506
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However, the highly birefringent texture seen for the pristine sample before applying an electric field (Fig. 2a) is difficult to explain with an anticlinic tilt correlation and suggests a predominately synclinic phase structure. Probably, field induced alignment has a significant influence on tilt correlation
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However, the highly birefringent texture seen for the pristine sample before applying an electric field (Fig. 2a) is difficult to explain with an anticlinic tilt correlation and suggests a predominately synclinic phase structure. Probably, field induced alignment has a significant influence on tilt correlation.
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48
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0037007924
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78049339505
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FE phase in Fig. 7
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FE phase in Fig. 7.
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0000088785
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65
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63049088751
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Bent-core molecules with oligo(phenylene ethinylene) units can also be considered as π-conjugated cores, but in most of the reported compounds long lateral alkyl chain was attached to these cores and this leads to the formation of nematic phases, for example see: M. Lehmann J. Seltmann A. A. Auer E. Prochnow U. Benedikt J. Mater. Chem. 2009 19 1978 1988
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