Kim, Jae-Hoon published the artcileα,ω-Bis[4-(4′-(S)-(+)-2-methylbutylbiphenyl-4-carboxy)phenoxy]alkanes – synthesis and liquid crystalline properties of new dimesogenic compounds, SDS of cas: 50670-76-3, the publication is Journal of the Korean Chemical Society (1998), 42(6), 679-695, database is CAplus.
α,ω-Bis[4-(4′-(S)-(+)-2-methylbutoxybiphenyl-4-carboxy)phenoxy]alkanes were synthesized, and their thermal and liquid crystalline properties were studied. The chains length of the central polymethylene spacers, x, of the chiral twin compounds was varied from 3 to 12. These compounds were characterized by elemental analyses, IR and NMR spectroscopy, DTA (DSC), and cross-polarized microscopy. All compounds are enantiotropic liquid crystalline, and the values of melting (Tm) and isotropization temperature (Ti) as well as ΔH4 and ΔSi decreased in a zigzag fashion, revealing the so-called odd-even effect as x increased. Their mesomorphic properties fell into four categories depending on x. Compounds with x = 3, 4 and 5 formed only a cholesteric phase on heating, while on cooling they went through two transitions of isotropic (I)-to-cholesteric (Ch) and Ch-to-smectic A (SA) phases before crystallization Compounds with x = 6, 8 and 10 exhibited only a cholesteric phase both on heating and on cooling. Compounds with x = 7 and 9 went through three transitions of crystal (C)-to-SA, SA-to-Ch, and Ch-to-I phases on heating while on cooling they went through four transitions of I-to-Ch, Ch-to-SA, SA-to-Smectic C (SC), and SC-to-C phases in that order. Compounds with x = 11 and 12 went reversibly through four transitions of C-to-SC, SC-to-SA, SA-to-Ch, and Ch-to-I phases.
Journal of the Korean Chemical Society published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, SDS of cas: 50670-76-3.
Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics