Chemoselective deacylation of functionalized esters catalyzed by dioxomolybdenum dichloride
摘要:
Among five different oxidometallic species and two Lewis acids investigated, MoO(2)Cl(2) shows the best catalytic and chemoselective activity for the deacylation of esters in methanol at ambient or elevated temperature. Both high efficiency and chemoselectivity were achieved for substrates bearing different ether or ester groups. Acylated mono and disaccharides can also be selectively deacetylated in good yields, leading to useful carbohydrate templates for further synthetic manipulations. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis and Crystal Structures of [W(3,6‐dichloro‐1,2‐benzenedithiolate)
<sub>3</sub>
]
<sup>
<i>n</i>
–
</sup>
(
<i>n</i>
= 1, 2) and [Mo(3,6‐dichloro‐1,2‐benzenedithiolate)
<sub>3</sub>
]
<sup>2–</sup>
: Dependence of the Coordination Geometry on the Oxidation Number and Counter‐Cation in Trigonal‐Prismatic and Octahedral Structures
somewhat of an octahedral contribution is included in (Ph 4 P) 2 -[W(bdtCl 2 ) 3 ] (1b). However, almost the same coordinationstructures are present in the series of structures (Et 4 N)[W(bdtCl 2 ) 3 ] (2a), (Ph 4 P)[W(bdtCl 2 ) 3 ] (2b), and (C 5 NH 6 )[W(bdtCl 2 ) 3 ] (2c), with an oxidation number of +5. These structures adopt an intermediate geometry between trigonal prismatic and octahedral. No geometrical
[Mo(NTos)2Cl2]n (2 a) can be achieved via metathesis of [Mo(O)2Cl2]n with sulfinyl amide Tos-NSO. An attempt to synthesize a molybdenum phosphine complex in an analogous manner as 1 c, but starting from 2 a or its base adduct [Mo(NTos)2Cl2(dme)] (2 b), leads to nitrene transfer to the phosphine. Me3P=NTos can be detected and the d2 molybdenumcomplex [Mo(NTos)Cl2(PMe3)3] (3) is isolated. 3 is characterized
Die Protolyse von Wolframhexachlorid mit Tosylamid bietet den direkten Zugang zum Koordinationspolymer [W(NTos)2Cl2]n (1 a)。1 a last sich in Gegenwart von Donorliganden inmolekulare Komplexe, z。B. [W(NTos)2Cl2(dme)] (1 b), [W(NTos)2Cl2(PMe3)2] (1 c) 和 [W(NTos)2Cl2(4,4'-Me2bipy)] (1 d) 超人。Die Synthese der homologen Molybdanverbindung [Mo(NTos)2Cl2]n (2 a) gelingt dagegen uber die Metathese von [Mo(O)2Cl2]n
The use of silylethers and silylthioethers in syntheses of oxohalide and thiohalide compounds of molybdenum and tungsten
作者:Vernon C. Gibson、Terence P. Kee、Alan Shaw
DOI:10.1016/s0277-5387(00)86956-9
日期:1990.1
Abstract Convenient procedures for the preparation of molybdenum and tungsten oxo- and thiohalides are described which exploit reactions between transition metal halides and bis(silyl)ether and -thioether reagents, according to the general equation: MCI x +(Me 3 Si) 2 Y (Y = O,S)→M(Y)Cl x−2 +2Me 3 SiCl. W(O)Cl 4 ( 1 ) and Mo(O)Cl 3 ( 5 ) are formed in high yield by room temperature treatment of WCl
Oxygen activation and catalytic aerobic oxidation by Mo(<scp>iv</scp>)/(<scp>vi</scp>) complexes with functionalized iminophenolate ligands
作者:Niklas Zwettler、Martina E. Judmaier、Lara Strohmeier、Ferdinand Belaj、Nadia C. Mösch-Zanetti
DOI:10.1039/c6dt01692h
日期:——
PMe3, where complex 1 bearing donor atom functionalized ligands led to higher conversion and selectivity than complex 2 coordinated by phenyl iminophenolate ligands. In the oxidation of PPh3, complex 2 leads to higher conversion compared to 1. In a control experiment, phenyl-based dinuclear μ-oxido complex 7, derived from complex 2, was found to be catalytically active, which suggests a lower energy barrier
Synthesis, Characterization and Biological Evaluation of Transition and Inner Transition Metal Complexes of Ligands Derived Schiff Base from 1-phenyl-2, 3-dimethyl-4-(4-iminopentan-2-one)-pyrazole-5-one and 2-aminophenol
作者:ANUBHA SAXENA、RAJNEESH SAXENA
DOI:10.13005/ojc/290228
日期:2013.6.30
for all these complexes. The ligand and selected transitionmetalcomplexes have also been evaluated for antimicrobial activity against S. aureus and B. subtilis. From the biological data, we can infer that Schiffbase of 4-aminoantipyrin has better antimicrobial activity in comparison to the native one. Also, the antimicrobial activity is highly influenced by the nature of the metal ion. The order