Hydrogen Bonding in Anion Recognition: A Family of Versatile, Nonpreorganized Neutral and Acyclic Receptors
作者:Konstantinos Kavallieratos、Christina M. Bertao、Robert H. Crabtree
DOI:10.1021/jo982382l
日期:1999.3.1
The diamides and disulfonamides m-C(6)H(4)(CONHAr)(2) (Ar = Ph, 1; p-n-BuC(6)H(4), 2, 2,4,6-Me(3)C(6)H(2), 3), m-C(6)H(4)(SO(2)NHPh)(2), 4, and 2,6-C(6)H(3)N(CONHPh)(2), 5, readily synthesized on a multigram scale, bind strongly to halides and acetate in organic solvents with K(a)'s as high as 6.1 x 10(4) (NMR spectroscopy). The binding stoichiometry is 1:1 in solution for all cases except for the
二酰胺和二磺酰胺mC(6)H(4)(CONHAr)(2)(Ar = Ph,1; pn-BuC(6)H(4),2,2,4,6-Me(3)C( 6)H(2),3),mC(6)H(4)(SO(2)NHPh)(2),4和2,6-C(6)H(3)N(CONHPh)(2 )(5)易于以克数合成,在有机溶剂中与K(a)高达6.1 x 10(4)的卤化物和乙酸盐牢固结合(NMR光谱)。在所有情况下,溶液的结合化学计量比均为1:1,但4.F(-)和4.OAc(-)络合物除外,其中发现了1:1和1:2的结合化学计量比。CD(2)Cl(2)((1)H NMR)中的缔合常数遵循所有受体的趋势Cl(-)> Br(-)> I(-)。F(-)和OAc(-)的结合可能强于或弱于Cl(-),具体取决于受体的性质。5中存在吡啶氮,而1-3和5中存在较高刚性的酰胺,而4中存在较低刚性的磺酰胺结构则增加了对较小阴离子的选择性。2