α-Propargyl amino acid-derived optically active novel substituted polyacetylenes: Synthesis, secondary structures, and responsiveness to ions
作者:Hiromitsu Sogawa、Masashi Shiotsuki、Fumio Sanda
DOI:10.1002/pola.25975
日期:2012.5.15
Poly[(S)‐1a] and poly[(S)‐4b] also exhibited clear CD signals, which were different from those of the precursors, poly[(S)‐1] and poly[(S)‐4]. The solution‐state IR measurement revealed the presence of intramolecular hydrogen bonding between the carbamate groups of poly[(S)‐1] and poly[(S)‐1a]. The plus CD signal of poly[(S)‐1a] turned into minus one on addition of alkali hydroxides and tetrabutylammonium
新型旋光取代的乙炔HCCCH 2 CR 1(CO 2 CH 3)NHR 2 [(S)-/(R)-1:R 1 = H,R 2 = Boc,(S)-2:R 1 = CH 3,R 2 = Boc,(S)‐3:R 1 = H,R 2 = Fmoc,(S)‐4:R 1 = CH 3,R 2 = Fmoc(Boc =叔由α-炔丙基甘氨酸和α-炔丙基丙氨酸合成-丁氧基羰基,Fmoc = 9-芴基甲氧基羰基],并与铑催化剂聚合,以高收率提供数均分子量为2400-38,900的聚合物。极化,圆二色性(CD),和紫外可见分光分析表明,聚[(小号) - 1 ],聚[([R )- 1 ],和聚[(小号- )4形成的主要单手螺旋结构]在极性和非极性溶剂中均如此。带有未保护羧基的聚[(S)-1a ]是通过对聚[(S)-1 ]和聚[(通过使用哌啶去除聚[(S)-4 ]的Fmoc基团,可得到带有未保护氨基的S)-4b ]