Rare-Earth Metal Alkyl and Hydride Complexes Stabilized by a Cyclen-Derived [NNNN] Macrocyclic Ancillary Ligand
作者:Masato Ohashi、Marcin Konkol、Iker Del Rosal、Romuald Poteau、Laurent Maron、Jun Okuda
DOI:10.1021/ja801771u
日期:2008.6.1
A trinuclear rare-earth metal hydridecomplex was synthesized from the dialkyl complexsupported by a monoanionic [NNNN] macrocycle and shown to catalyze the hydrosilylation of olefins efficiently.
Concerning Two-Metal Cooperativity in Model Phosphate Hydrolysis
作者:Martin Leivers、Ronald Breslow
DOI:10.1006/bioo.2001.1221
日期:2001.12
ligands were tested for cooperativity in the hydrolysis of phosphate esters. It was shown that rate enhancements were in part contributed by binding to the hydrophobic linkers when the substrates were also hydrophobic, and two metal cooperativity was not found to be present. Kinetic order tests were performed and shown to be superior to previous methods for analyzing cooperativity.
Regioselective synthesis of 1,7-diprotected 1,4,7,10-tetraazacyclododecane and preparation of a dialcohol dicarboxylic macrocyclic ligand
作者:Arnaud Dumont、Vincent Jacques、Peng Qixiu、Jean F. Desreux
DOI:10.1016/s0040-4039(00)73077-2
日期:1994.5
The reaction of 1,4,7,10-tetraazacyclododecane with p-toluenesulfonyl chloride in pyridine or with diethyl phosphite and CCl4 in a water/CH2Cl2 mixture yields selectively the 1,7-diprotected regioisomer. The 1,7-diprotected tetraaza cycles are interesting starting materials, for instance for the preparation of 4,10-bis(2'-hydroxyethyl)-1,7-bis(carboxymethyl)-1,4,7,10-tetraazacyclododecane.
1,4-Bis-(4-toluenesulphonyl)-1,4,7,10-tetraazacyclododecane from the direct tosylation of 1,4,7,10-tetraazacyclododecane
作者:Jonathan P. Hill、Christopher E. Anson、Annie K. Powell
DOI:10.1016/s0040-4039(02)01766-5
日期:2002.10
The reaction between 1,4,7,10-tetraazacyclododecane and 4-toluenesulphonyl chloride in triethylamine/chloroform yields both the disubstituted isomers of bis-(4-toluenesulphonyl)-1,4,7,10-tetraazacyclododecane. This has been confirmed by H-1 NMR and X-ray crystallographic analyses. (C) 2002 Elsevier Science Ltd. All rights reserved.
Dumont Amaud, Jacques Vincent, Qixiu Peng, Desreux Jean F., Tetrahedron Lett, 35 (1994) N 22, S 3707-3710
作者:Dumont Amaud, Jacques Vincent, Qixiu Peng, Desreux Jean F.