Perhydrotriquinacenic hosts. 2. Synthesis and complexation properties of speleands of C3symmetry.
摘要:
The synthesis and complexation properties of four speleands (13-16) derived from triol 4 and the chiral C3 concave cap 3, linked to the cyclic aza-oxa macrocycle 2 by means of ester-amide bridges, are described.
Specific Binding of Primary Ammonium Ions and Lysine-Containing Peptides in Protic Solvents by Hexahomotrioxacalix[3]arenes
作者:Simon Lambert、Kristin Bartik、Ivan Jabin
DOI:10.1021/acs.joc.0c01294
日期:2020.8.7
H-bonds with the ethereal macrocycle. The remarkable electronic, size, and shape complementarity between primary ammonium ions and the two cavity-based receptors leads to an unprecedented specificity for primary ammonium ions over secondary, tertiary, and quaternary ones. These binding properties were exploited for the selective liquid–liquid extraction of primary ammonium salts from water and for the
Guest inclusion properties of calix[6]arene-based unimolecular cage compounds. On their high Cs+ and Ag+ selectivity and very slow metal exchange rates
groups of anisole units and the lower hemisphere is closed by a mesitylene cap and three anisole methoxy groups. The 1H NMR spectrum was scarcely changed at wide temperature range (30 ∼ 130°C), indicating that the structure is extremely rigidified. Both solvent extraction and spectroscopic studies established that this cavity shows the high selectivity toward Cs+ among alkali metal cations, the high
1,3,5-三-O-烷基烷基杯[6]芳烃与1,3,5-三(溴甲基)苯的反应生成了封端的杯[6]芳烃(2个在上边缘带有叔丁基的芳烃)3个不含叔丁基的化合物),出乎意料的高收率(80 – 91%)。通过MM3计算,X射线分析和1 H NMR光谱对2和3进行的联合研究表明,这些杯[6]芳烃具有独特的结构,该结构由三个均三聚的均三甲苯基连接的苯基单元和三个直立的苯甲醚交替排列组成单位。特别地,化合物2具有封闭的离子载体腔:上半球被三个封闭苯甲醚单元和下半球的叔丁基被1,3,5-三甲苯基帽和三个苯甲醚甲氧基封闭。的1 H NMR谱在宽的温度范围(30〜130℃),几乎没有变化,这表明结构极其刚性化。溶剂萃取和光谱学研究均证实,该空腔在碱金属阳离子中显示出对Cs +的高选择性,与Ag +的高亲和力以及与RNH 3 +的中等亲和力。非常令人惊讶的是,2-苦味酸铯与铯的缔合-解离过程是如此缓慢,以致于传统
Multisite molecular receptors and co-systems ammonium cryptates of macrotricyclic structures
作者:F. Kotzyba-Hibert、J.M. Lehn、P. Vierling
DOI:10.1016/s0040-4039(00)77745-8
日期:1980.1
CRAM, DONALD J.;CARMACK, RICHARD A.;DEGRANDPRE, MARK P.;LEIN, GEORGE M.;G+, J. AMER. CHEM. SOC., 109,(1987) N 23, 7068-7073
作者:CRAM, DONALD J.、CARMACK, RICHARD A.、DEGRANDPRE, MARK P.、LEIN, GEORGE M.、G+
DOI:——
日期:——
STEWART K. D.; MIESCH M.; KNOBLER C. B.; MAVERICK E. F.; CRAM D. J., J. ORG. CHEM., 51,(1986) N 23, 4327-4337
作者:STEWART K. D.、 MIESCH M.、 KNOBLER C. B.、 MAVERICK E. F.、 CRAM D. J.