A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article£¬once mentioned of 33100-27-5, category: chiral-catalyst
Synthesis, X-ray crystal structures and thermal behavior of calcium beta-diketonate complexes [Ca(fod)2(15-crown-5)] and [Ca(fod)(C3F7COO)(15-crown-5)] (Hfod?=?1,1,1,2,2,3,3-heptafluoro-7,7-dimethyl-4,6-octanedione)
The synthesis of the Ca-beta-diketonate complexes with 15-crown-5 [Ca(fod)2(15-crown-5)] (1), [Ca(fod)(C3F7COO)(15-crown-5)] (2), (Hfod = 1,1,1,2,2,3,3-heptafluoro-7,7-dimethyloctane-4,6-dione; 15-crown-5 = 1,4,7,10,13-pentaoxacyclopentadecane) is described. The complex 1 has been prepared by reaction of metallic Ca with 1 equiv of 15-crown-5 and 2 equiv of Hfod in ethanol. The reaction of calcium covered by surface calcium hydroxide with excess of Hfod in presence of 15-crown-5 in boiling toluene results in the complex 2 as main product and complex 1 as by-product. The solvated complex [Ca(fod)(C3F7COO)(15-crown-5)](CH2Cl2) (3) was obtained by recrystallization from CH2Cl2-hexane solution of 2. The complexes 1, 2 were characterized by elemental analyses, IR-spectroscopy, NMR-spectroscopy. The molecular structures of 1, 3 were characterized by single-crystal X-ray diffraction method. Complexes 1, 3 have monomolecular structures. In 1 the calcium cation Ca2+ is outside the crown-ether cavity and coordinated by five O atoms of 15-crown-5 and four O atoms of two fod-ligands; the average Ca-Ofod distance is 2.38(2) A and the average Ca-Ocrown distance is 2.64(2) A. In the compound 3 the coordination environment of the Ca is set up by two O atoms of chelating fod ligand, one O atom of C3F7COO ligand and five O atoms of 15-crown-5 ligand. Ca atom is outside 15-crown-5 plane, beta-diketonate and carboxylate ligands are in cis-position relative to 15-crown-5. The average Ca-Ofod bond distance 2.318(2) A and Ca-OC3F7COO bond distance 2.311(2) A are practically equal. The 1 and 2 are thermal stable in 50?227 C and in 50?180 C temperature ranges, respectively. In dynamic vacuum (residual pressure 10?2 Torr) complexes 1 and 2 sublimed in 70?110 C temperature range congruently.
Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.category: chiral-catalyst. In my other articles, you can also check out more blogs about 33100-27-5
Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare