There is disclosed a process process for producing a cyclopropanecarboxylate of formula (1):
1
which process comprises reacting cyclopropanecarboxylic acid of formula (2):
2
with a monohydroxy compound of formula (3):
R
6
OH (3),
in the presence of a catalyst compound comprising an element of to Group 4 of the Periodic Table of Elements.
(100) three‐axis‐oriented BaTiO3 thin film with BaZrO3 buffer layer was prepared on an MgO(100) substrate by the chemical solution deposition method. The epitaxial growth of the (100) BaTiO3 layer was enabled by inducing a BaZrO3 bottom layer. Transmission electron microscopy revealed cube‐on‐cube epitaxial growth. The BaTiO3 thin film exhibited a (100) three‐axis‐orientation that followed the (100) orientation of the MgO substrate and the (100) orientation of the BaZrO3 bottom layer, as observed from an X‐ray pole figure measurement and the selected area electron diffraction patterns.
BaTi1–xZrxO3 nanopowders prepared by the modified Pechini method
作者:M. I. B. Bernardi、E. Antonelli、A. B. Lourenço、C. A. C. Feitosa、L. J. Q. Maia、A. C. Hernandes
DOI:10.1007/s10973-006-7767-z
日期:2007.3
The results reported here based on a study of BaTi1–xZrxO3 (x=0, 0.2 and 1) nanometric powders prepared by the modified Pechini method. The powder samples annealed from 600 to 1000°C/2 h were characterized by thermogravimetric analysis (TG), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The decomposition reactions of resins were studied using thermal analysis measurements. The barium titanate zirconate system presented just one orthorhombic phase. Furthermore, this study produced BaTiO3 powders with a tetragonal structure using shorter heat treatments and less expensive precursor materials than those required by the traditional methods.
Hepta-coordinated heteroleptic derivatives of zirconium(IV): Synthesis, structural characterization and ring opening polymerization of ε-caprolactone
作者:Giri Prasanth Vuppalapati、Ravindranath S. Rathore、Madhvesh Pathak、Sathiyanarayanan Kulathu Iyer
DOI:10.1016/j.poly.2016.01.035
日期:2016.3
H2L4 = C17H13NO2) and β-diketones (acetylacetone/dibenzoylmethane) in a 1:1:2 stoichiometry using dry benzene and ethanol as solvents. All these newly synthesized solid derivatives were fairly soluble in common organic solvents. They were characterized by elemental analyses, FTIR and NMR (1H and 13C) spectral studies. Single crystal XRD data of complexes 1, 2, 3 and 5 indicated the hepta-coordination and monomeric
该一系列的类型的锆(IV)的新庚协调杂衍生物的[(CH 3 COCHCOCH 3)2 ZRL](1,3,5和7)和[(C 6 H ^ 5 COCHCOC 6 ħ 5)2 ZRL ](2,4,6和8)(L =双阴离子[ONO] -tridentate辅助配体)通过的Zr(OPR反应定量合成我)4 ·镨我OH与三齿席夫碱配体ħ 2大号x(H 2 L 1 = C 13 H 11 NO 2 ; H 2 L 2 = C 13 H 10 BrNO 2 ; H 2 L 3 = C 14 H 13 NO 3 ; H 2 L 4 = C 17 H 13 NO 2)和β-二酮(乙酰丙酮/二苯甲酰甲烷)以1:1:2的化学计量比,以干燥的苯和乙醇为溶剂。所有这些新合成的固体衍生物都相当溶于普通的有机溶剂。它们通过元素分析,FTIR和NMR(1 H和13 C)光谱研究进行了表征。复合物的单晶X射线衍射数据1
Immortal ring-opening polymerization of lactides with super high monomer to catalyst ratios initiated by zirconium and titanium complexes containing multidentate amino-bis(phenolate) ligands
作者:Baolong Wang、Huanqin Zhao、Liying Wang、Junmin Sun、Yongfeng Zhang、Zhenzhu Cao
DOI:10.1039/c7nj00483d
日期:——
synthesized. These complexes were characterized by 1H and 13C NMR spectroscopy and elemental analyses. The solid-state structures of complexes 2 and 3 were determined by X-ray diffraction. Complexes 1, 2, 3, and 4 were highly active initiators for the ring-openingpolymerization of L-lactide (L-LA) and rac-lactide (rac-LA). The experimental results show that complexes 1 and 2 are highly active and excellent
锆配合物(L 2 Zr,L = –OC 6 H 2 -4-R 1 -6-R 2 -2-CH 2 -N [(CH 2)3 -N(CH 2 CH 2)2 O] -CH 2 -4-R 1 -6-R 2 -C 6 H 2 O–,R 1 = Me,R 2 = t Bu,络合物1; R 1 = R 2 = t Bu,络合物2制备了含有两个对称的氨基双(酚盐)配体的)。此外,钛络合物(LTi(O i Pr)2,L = –OC 6 H 2 -4-R 1 -6-R 2 -2-CH 2 -N [(CH 2)3 -N(CH 2 CH 2)2 O] -CH 2 -4-R 1 -6-R 2 -C 6 H 2 O–,R 1 = Me,R 2 = t Bu,络合物3; R 1 = R 2 = t合成了基于对称氨基双(酚盐)配体的Bu,络合物4)。这些配合物通过1 H和13 C NMR光谱法和元素分析进行表征。配合物2和