Cyclopalladation of bis(pyrazolyl)methane derivatives. Synthesis of a stable 5.6.5 chelate ring system with Csp3Pd bonds
作者:Olga Juanes、Javier de Mendoza、Juan C. Rodriguez-Ubis
DOI:10.1016/0022-328x(89)87126-8
日期:1989.3
with palladium is favored by the arrangement of the nitrogen donor atoms. The boat conformation observed for the six-membered chelate-ring is attributed to the bulk of the lateral chains. Double cyclopalladation of the ligand affords a 5.6.5 fused-ring system. A 1H NMR study of this metallocycle shows two rigid five-membered lateral rings and a more flexible six-membered central ring.
描述了用丙二酰基残基官能化以形成分子内CPd键的双(吡唑基)甲烷衍生物。氮供体原子的排列有利于配体与钯的络合。对于六元螯合环观察到的船形是由于侧链的大部分。配体的双环palpalpalation提供了一个5.6.5稠环系统。该金属环的1 H NMR研究显示两个刚性的五元侧环和一个更灵活的六元中心环。
A Simple Polyheterotopic Molecular Receptor Derived from Bispyrazolylmethane Showing Ambivalent Allosteric Cooperation of Zinc(II)
作者:Ernesto Brunet、Olga Juanes、María José de la Mata、Juan C. Rodríguez-Ubis
The preparation of compounds 1–4 as simple systems to display allostery is described. Transport experiments (bulk liquid membrane) of ammonium cations in the presence or absence of ZnI2 in the receiving and donor phases evidenced strong negative or positive allosteric effects of the metal towards ammonium complexation, which depended on the relative arrangement of crowns with respect to the pyrazole