| Summary: | 碩士 === 國立高雄師範大學 === 化學系 === 104 === In this thesis, a series of low symmetric hexaphenylbenzene (HPB) derivatives were synthesize by alkynes [2+2+2] cyclotrimerization which are the precursors of hexabenzocoronene (HBC) derivatives, and high regiospecific hexaphenylbenzene derivatives were obtained, only 1,2,4-regiomer or 1,3,5-regiomer, by controlling electron donating-withdrawing and steric hindrance effective.
Depend on this method, low symmetric hexa-peri-hexabenzocornene derivatives were successfully gotten by simple steps, In general, it takes 30~40 steps to afford it. All compounds were characterized by 1H and 13C-NMR, and MALDI-MS spectrometry. The thermotropic liquid crystalline (LC) properties of the compounds were investigated by polarizing optical microscopy (POM), differential scanning calorimetry (DSC), and powder X-ray diffractometry (PXRD).
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