Reactions at high pressure, part 18; volumes of activation and of reaction for the wittig reaction
作者:Neil S. Isaacs、Obeid Hassan Abed
DOI:10.1016/s0040-4039(00)84159-3
日期:1986.1
between 1 and 1000 bar of reactions between triphenyl-p-nitrobenzylidenephosphorane, and a series of substituted benzaldehydes .Values of ΔV≠ lie in the range −20 to −30 cm3mol−1 and are somewhat solvent-dependent. The corresponding volume of reaction is less negative. These measurements are in agreement with the accepted reaction mechanism and suggest that the scope of the reaction may be extended by the
Promising new catalytic properties of a Co (II)‐carboxamide complex and its derived Co
<sub>3</sub>
O
<sub>4</sub>
nanoparticles for the Mizoroki‐Heck and the Epoxidation reactions
The new Co(II) ‐ carboxamide complex (1) and Co3O4 nanoparticles (2), by way of thermal decomposition of (1) have been efficiently synthesised in the environment‐friendly. X‐ray diffraction reveals a slightly distorted octahedral coordination of cobalt (four nitrogens and two oxygens) in (1) and regular octahedral or tetrahedral ones (oxygens only) in (2). The investigation of (1) and (2) in the Mizoroki‐Heck
新的Co(II)-羧酰胺配合物(1)和Co 3 O 4纳米颗粒(2)通过热分解(1)已在环境友好的条件下有效合成。X射线衍射显示稍微扭曲的八面体的钴(四个氮和两个氧)在(协调1)四面体酮(仅氧)在(和规则的八面体或2)。对(1)和(2)在Mizoroki-Heck中的研究和链烷烃反应的环氧化表明,它们都是功能强大,绿色且价格便宜的催化剂。
Lithium hydroxide as base in the Wittig reaction. A simple method for olefin synthesis
A mild and practical procedure for the Wittig olefination, promoted by lithium hydroxide and triphenylbenzyl phosphonium bromide, has been set up for the synthesis of stilbenes and styrenes. The experimental conditions allow aromatic, heteroaromatic, unsaturated and saturated aliphatic aldehydes to give final products in good yields.
Imidazolium ionic liquid-tagged palladium complex: an efficient catalyst for the Heck and Suzuki reactions in aqueous media
作者:Pankaj Nehra、Bharti Khungar、Kasiviswanadharaju Pericherla、S. C. Sivasubramanian、Anil Kumar
DOI:10.1039/c4gc00525b
日期:——
soluble, and efficient ionic liquid-tagged Schiffbasepalladiumcomplex was prepared. The synthesized complex was well characterized by NMR, mass spectrometry, FT-IR, UV-visible spectroscopy and powder X-ray diffraction. The complex was used as a catalyst for the Suzuki and Heck cross-coupling reactions in water. Good to excellent yields were achieved using a modest amount of the catalyst. In addition
Immobilized Pd on (<i>S</i>)-methyl histidinate-modified multi-walled carbon nanotubes: a powerful and recyclable catalyst for Mizoroki-Heck and Suzuki-Miyaura C-C cross-coupling reactions in green solvents and under mild conditions