查詢結果分析
相關文獻
頁籤選單縮合
題 名 | Chiral Liquid Crystals Synthesized from 2(S)-[2(R)-Methylhexyloxy]propanol and Its (S,S)-Diastereomer |
---|---|
作 者 | 李惠貞; 謝明憬; 葉淑文; 鄭寶樹; 蔡文亮; | 書刊名 | Journal of the Chinese Chemical Society |
卷 期 | 49:3 2002.06[民91.06] |
頁 次 | 頁379-382 |
分類號 | 346.01 |
關鍵詞 | Chiral propanol; Chiral liquid crystal; Ferroelectricity; Conformation; |
語 文 | 英文(English) |
英文摘要 | Two new chiral alcohols, 2(S)-[2(R)-methylhexyloxy] propanol (5) and 2(S)-[2(S)-methylhexyloxy] propanel (6), were prepared from the corresponding propionic acid ethyl ester 1 and 2 in the presence of sodium borohydride. They were used as the chiral moiety for the synthesis of two diastereomeric liquid crystals 7 and 8. Both of them exhibit the phase sequence I-SmA-SmC*-SmX-Cr. The mesogenic properties of the (S,S)-diastereomer 8 are more unique in comparison with those of the (S,R)-diastereomer 7. It possesses not only lower SmA and SmC* phase transition temperature, 103℃ vs. 112℃ for SmA phase and 31℃ vs. 65 ℃ for SmC* phase, but wider SmA and SmC* phase range, 40 ℃ vs. 31℃ for SmA phase and 72℃ vs. 47℃ for SmC* phase. The diastereomer 8 also has a larger Ps value than that of 7, 24 vs. 15 nC cm□ measured at Tc-T-10℃. The difference in these mesogenic properties is discussed by comparing their conformation difference at the molecular part of benzoate. |
本系統中英文摘要資訊取自各篇刊載內容。