Cyclic bis(β-diketonate)- and bis(β-ketoesterate)-bridged titanium and zirconium alkoxide derivatives
作者:Christian Maurer、Ernst Pittenauer、Van An Du、Günter Allmaier、Ulrich Schubert
DOI:10.1039/c1dt11780g
日期:——
Ti(OiPr)4 with various bis(β-diketones) and bis(β-ketoesters) (LH2) results in the formation of dimeric complexes [Ti(OiPr)2L]2, where each metal centre is coordinated by two terminal OiPr ligands and two bridging β-diketonate or β-ketoesterate groups (L). Macrocycles containing two M(OiPr)2 moieties are thus formed. Reaction of Zr(OiPr)4 with the same bis(β-diketones) and bis(β-ketoesters) results
Ti(O i Pr)4与各种双(β-二酮)和双(β-酮酸酯)(L H 2)的反应导致形成二聚体复合物[Ti(O i Pr)2 L ] 2,其中每个金属中心由两个末端O i Pr配体和两个桥接的β-二酮酸酯或β-酮酸酯基(L)协调。由此形成包含两个M(O i Pr)2部分的大环。Zr(O i Pr)4与相同的双(β-二酮)和双(β)反应-酮酸酯)产生不同的化合物,具体取决于连接两个官能团的有机间隔基。用较短的间隔基得到具有与相应钛配合物相同结构的化合物[Zr L(O i Pr)2 ] 2 ·2 i PrOH。然而,利用更长的间隔基,形成具有更高取代度的配合物,例如(Zr L 2)2和Zr 2 L 3(O i Pr)2 ·2 i PrOH。通过ESI-MS阐明了所有化合物的分子量和结构。相应的[M + Na] +的MS / MS前体离子基于特定结构的产物离子证实了拟议的结构。溶液NMR实验和DFT计算另外支持了所提出的结构。
Stabilized Polyvinylhalide resin
申请人:PHOENIX CHEMICAL CORPORATION
公开号:EP0046161A2
公开(公告)日:1982-02-24
1,3-Dicarbonyl compounds are provided having the formula:
wherein:
R1 is selected from the group consisting of hydrogen, hydrocarbon groups having from one to about eighteen carbon atoms and such groups substituted with one or more groups selected from the group consisting of halogen, hydroxy, alkoxy OR1, ester COORl, alkyl and alkoxycarbonyl alkyl having from one to about eighteen carbon atoms, and
R2 is selected from the group consisting of hydrocarbon having from one to about eighteen carbon atoms and such groups substituted with one or more groups selected from the group consisting of halogen, hydroxy, alkoxy OR1, ester COOR1, alkyl and alkoxycarbonyl alkyl having from one to about eighteen carbon atoms;
one R1 and R2 may be linked together as an alkylene group to form a cyclic or ring structure;
n is number from 1 to 3; and
Z is a polyvalent linking radical selected from the group consisting of a direct linkage between the groups; polyvalent hydrocarbon R3;
wherein:
R3 is a polyvalent hydrocarbon group having from one to about eighteen carbon atoms;
R4 and Rs are selected from the group consisting of hydrogen and hydrocarbon groups having from one to about eighteen carbon atoms; and R4 and R5 may be linked together as an alkylene to form a cyclic or ring structure;
X is -O- od -S-;
m is 0 or 1; and
R6 is selected from the group consisting of hydrogen, hydrocarbon having from one to about eighteen carbon atoms, and -R3-; as well as metal and organotin enolate salts thereof.
The compounds are effective in enhancing the resistance to deterioration by heat and light of polyvinyl halide resins.