77249-37-7Relevant academic research and scientific papers
Catalytic acceptorless dehydrogenative coupling of arylhydrazines and alcohols for the synthesis of arylhydrazones
Li, Feng,Sun, Chunlou,Wang, Nana
, p. 8031 - 8039 (2015/03/18)
The direct synthesis of arylhydrazones via catalytic acceptorless dehydrogenative coupling of arylhydrazines and alcohols has been accomplished. More importantly, complete selectivity for arylhydrazones and none of the N-alkylated byproducts were generated in this process, which exhibit new potential and provide a new horizon for the development of catalytic acceptorless dehydrogenative coupling reactions.
Fac-Specific syntheses of homochiral [Fe(NN′)3] 2+ complexes (NN′ = pyridine keto-hydrazone); Origins of the stereoselectivity
Sebli, Cynthia Paul,Howson, Suzanne E.,Clarkson, Guy J.,Scott, Peter
experimental part, p. 4447 - 4454 (2010/07/04)
The 2-pyridinehydrazones (from condensation of pyridine-2-carbaldehyde and hydrazines) have previously been noted to have poor ligating ability as a result of a sterically demanding planar conformation. Destabilisation of this conformation is achieved through simple use of the ketohydrazones, and as a result the diamagnetic chiral tris-bidentate diimine complexes fac-[FeL 3]2+ are readily isolated. In the solid state, inter-ligand π-π stacking and complex/counter-ion H-bonding are apparent, and these features persist in solution according to dynamic NMR spectra, which also indicate extremely high stereoselectivity for the fac isomers (>200:1). The compounds crystallise as conglomerates, and time-resolved CD spectra of non-racemic samples indicate a high degree of persistence of chirality (racemisation t1/2ca 77 min). Variations of solvent and counter-ion indicate that H-bonding is unimportant in determining the structure of the cation. The fac-selectivity arises in the induction of a chiral conformation in the coordinated ligand, and the fact that such non-planar ligands can only be accommodated about the Fe(ii) centre if they all have the same absolute configuration. Adding a hydrazine N-methyl group increases the steric demand further, while retaining the novel non-planar conformation, and as a result paramagnetic chiral bis-bidentate complexes such as [FeL7 2(CH3CN)2]2+ are readily available.
Polycationic monochromophoric hydrazone compounds, dye compositions comprising such polycationic compounds and dyeing process using them
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Page/Page column 31, (2008/12/04)
The present disclosure relates to polycationic monochromophoric hydrazone compounds of following formula (I): wherein W1 is a heteroaromatic radical comprising 5 or 6 ring members, optionally condensed with an aromatic ring comprising 6 ring me
Phosphine-free hydrazone-Pd complex as the catalyst precursor for a Suzuki-Miyaura reaction under mild aerobic conditions
Mino, Takashi,Shirae, Yoshiaki,Sakamoto, Masami,Fujita, Tsutomu
, p. 2191 - 2194 (2007/10/03)
(Chemical Equation Presented) Glyoxal bis(N-methyl-N-phenylhydrazone) (1) and its related compounds such as 2-pyridinecarboxaldehyde N-methyl-N- phenylhydrazone (3) were prepared and examined as ligands for the Suzuki-Miyaura cross-coupling reaction of aryl halides and arylboronic acids. We found phosphine-free catalysts, such as Pd(OAc)2/hydrazone ligand 1 or 3, to be efficient catalysts for a variety of substrates to produce the coupling products in good yields.
