In 2018,Yeap, Guan-Yeow; Ooi, Yew-Hong published 《λ-Shaped liquid crystal trimers with dual terminal cholesteryl moieties: synthesis and concomitant of N*, SmA and cholesteric glassy phases》.Liquid Crystals published the findings.Application In Synthesis of 8-Bromooctanoic acid The information in the text is summarized as follows:
Two homologous series of λ-shaped chiral liquid crystal trimers composed of a laterally substituted benzylidene-aniline as the central core armed by two cholesteryl ester moieties via odd-even alkyl spacer are synthesized (I; X = halo, Me, OH; n = 4-10). All the compounds are mesogenic exhibiting both chiral nematic (N*) and SmA phases except for trimers bearing long spacers (n = 9-10). A pronounced odd-even effect is observed on the phase transition temperatures and clearing enthalpies when the spacer length is varied in which the even-parity members show higher value. The widening of N* phase upon elongation of the alkyl spacer can be interpreted as a result of the destabilization of SmA phase. Full recrystallization from the cholesteric phase upon cooling is not observed for all the compounds bearing long spacer, especially oxydecanoyl spacer. Instead, the anisotropic fluid vitrified to form the cholesteric glassy state characteristic of polymer at low temperature This finding is also evident from the polarizing optical microscope whereby non-crystalline texture which resembles the Grandjean texture with various reflection colors is observed upon cooling to low temperature The effect of the lateral substituents on the liquid-crystalline behavior is also discussed. In the experiment, the researchers used 8-Bromooctanoic acid(cas: 17696-11-6Application In Synthesis of 8-Bromooctanoic acid)
8-Bromooctanoic acid(cas: 17696-11-6) acid is used in the synthesis of 8-(N-Methyl-4,4′-bipyridinyl)- octanoic acid. 8-Mercaptooctanoic acid was prepared from 8-bromooctanoic acid.Application In Synthesis of 8-Bromooctanoic acid
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary