作者:Rafaela R. da Rosa、Irwing S. Brose、Guilherme D. Vilela、Aloir A. Merlo
DOI:10.1080/15421406.2015.1030975
日期:2015.5.3
This work describes the synthesis and characterization of a new liquid-crystalline compounds based on isoxazoles. Classical synthetic methodologies were employed in the preparation of this compounds, and the [3+2] 1,3-dipolar cycloaddition was the key step to prepare isoxazolines as precursors to isoxazoles. The structural and thermal characterization was performed using H-1 and C-13 NMR techniques, polarized-light optical microscopy and differential scanning calorimetry. Compounds 7a-e displayed the SmA mesophase. Soft crystal phase (CrE) was observed for compounds 7a and 7b containing chlorine and bromine atoms. For 7e containing a nitro group crystal phases below SmA mesophase were also observed.