Based on the synthesis of 2,2′-bisindan-1,1′,3,3′-tetrone(1),5,5′-dimethyl-2,2′-bisindan-1,1′,3,3′-tetrone(2) was obtained.This paper described the synthetic process and confirmed the characteristic of compound 2 by elemental analysis,1H NMR,FTIR and MS,then discussed a possible existing form.Compound 2 maily existed as en-ol form and had H-bonds in the molecule.At the same time,the ESR value of compound 2 was given as g=2.0042,could form stable radical.
The γ-substituted β-diketonate 2,4-dioxo-3-pentyl 4-[4-（n-octyloxy）cinnamoyl]oxybenzoate 1 and its pyrazole and isoxazole derivatives （2 and 3 respectively） have been synthesized and characterized by the spectroscopic methods and elemental analysis. The mesogenic properties of these compounds have been studied by polarizing optical microscopy （POM） and differential scanning calorimetry （DSC）. A monotropic nematic mesophase was observed for the β-diketonate 1, in contrast, the pyrazole 2 displays an enantiotropic smectic A and isoxazole 3 exhibits an enantiotropic nematic mesophase. The relationship between the structure and liquid crystalline properties has also been discussed.
