Alkaline earth metal amide complexes containing a cyclen-derived (NNNN) macrocyclic ligand: synthesis, structure, and ring-opening polymerization activity towards lactide monomers
作者： Jean-Charles Buffet , Julien P. Davin , Thomas P. Spaniol , Jun Okuda
DOI: 10.1039/C1NJ20259F
关键词: Monomer 、 Crystallography 、 Macrocyclic ligand 、 Amide 、 Lactide 、 Center (category theory) 、 Polymerization 、 Stereochemistry 、 Cyclen 、 Ring-opening polymerization 、 Chemistry
摘要: Cyclic tetra-amine 1,4,7-trimethyl-1,4,7,10-tetraazacyclododecane, (Me3TACD)H (= Me3[12]aneN4) was reacted with [M{N(SiMe3)2}2(thf)x] (M = Mg, x 0; M Ca, 2) in n-pentane to give thf-free complexes [{Me3TACD}M{N(SiMe3)2}] Mg (1); Ca (2)). Both compounds are monomeric solution and X-ray diffraction studies showed the metal centers be five-coordinated. The proligand [Ca{N(SiHMe2)2}2(thf)2] benzene-d6 [{(Me3TACD)SiMe2N(SiHMe2)}Ca{N(SiHMe2)2}] (3) hydrogen evolution. Single-crystal 3 a six-coordinated calcium center solid state. alkaline earth amide 1 catalyzed ring-opening polymerization of lactide monomers syndiotactic-rich polylactides from meso-lactide isotactic-rich rac- L-lactide.
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