Synthesis and structural characterization of N,N',N'',N'''-tetrasubstituted cyclams
作者:Luis G. Alves、Rui F. Munhá、Ana M. Martins
DOI:10.1007/s10593-021-02994-4
日期:2021.8
Tetrasubstituted cyclams of formulae (3,5-Me2C6H3CH2)4Cyclam and (4-MeC6H4SO2)4Cyclam were synthesized by reaction of cyclam with 4 equivalents of 3,5-dimethylbenzyl bromide and p-toluenesulfonyl chloride, respectively. Cyclam reacted with CO2 at atmospheric pressure to give (HOOC)4Cyclam, which displays four carbamic acid moieties. This reaction is reversible, and in aqueous solution a decarboxylation
式 (3,5-Me 2 C 6 H 3 CH 2 ) 4 Cyclam 和 (4-MeC 6 H 4 SO 2 ) 4 Cyclam 的四取代环烷烃是通过 Cyclam 与 4 当量的 3,5-二甲基苄基溴和分别为对甲苯磺酰氯。Cyclam在大气压下与 CO 2反应得到 (HOOC) 4 Cyclam,其显示四个氨基甲酸部分。该反应是可逆的,并且在水溶液中发生脱羧过程,形成环链球菌并释放 CO 2。
Kinetics of formation and dissociation of lanthanide(<scp>iii</scp>) complexes with the 13-membered macrocyclic ligand TRITA<sup>4−</sup>
作者:Edina Balogh、Raphaël Tripier、Robert Ruloff、Éva Tóth
DOI:10.1039/b418991d
日期:——
intermediate in size between the widely studied and medically used 12-membered DOTA(4-) and the 14-membered TETA(4-). The kinetic inertness of GdTRITA(-) was characterized by the rates of exchangereactions with Zn(2+) and Eu(3+). In the Zn(2+) exchange, a second order [H(+)] dependence was found for the pseudo-first-order rate constant (k(0)=(4.2 +/- 0.5) x 10(-7) s(-1); k'=(3.5 +/- 0.3) x 10(-1) M(-1)s(-1)