Coordination chemistry of arylhydrazones of methylene active compounds

Reaction of sodium 2-(2-(2,4-dioxopentan-3-ylidene)hydrazinyl) benzenesulfonate with ethylenediamine on Cu(ii) and Ni(ii) centres: efficient Cu(ii) homogeneous catalysts for cyanosilylation of aldehydes

“…(2), respectively (routes I and II in Scheme 2). 2 We can tentatively explain the different behaviours of the Cu(II) and Ni(II) salts, as follows: copper(II) is expected to be a stronger Lewis acid than nickel(II) and thus it can activate more effectively the AHBD ligand towards a nucleophilic atack of the amine (en) to form the final L 1 ligand. The formation of a novel Schiff base during complex formation is common.…”

“…2 Because of RAHB, the proton donor and acceptor atoms acquire partial opposite charges and strengthening of H-bond occurs. 1,2 The molecular structures of AHBDs are characterized by strong intramolecular N−H···O or O−H···N resonance-assisted hydrogen bonds (RAHB), involving a set of conjugated single and double bonds.…”

“…1,2 The molecular structures of AHBDs are characterized by strong intramolecular N−H···O or O−H···N resonance-assisted hydrogen bonds (RAHB), involving a set of conjugated single and double bonds. 2 On the other hand, cyanosilylation of carbonyl compounds with trimethylsilyl cyanide (TMSCN) (Scheme 1) to form new C-C bonds and to protect alcohol functions is an important reaction as the O-protected cyanohydrins can be transformed into a variety of building blocks, such as α-hydroxy acids, α-hydroxy ketones, α-amino acids, β-amino alcohols, vicinal diols, 1, 2diamines, etc. The position of the proton designates the nature of the donor functionality, which determines the reactivity of the AHBD and has an influence on intermolecular forces stabilizing the crystal structure.…”

Synthesis and characterization of new ferrocenyl bishydrazones

“…They are also interesting ligands [4] with various applications as sensors [5], in biology [6] or in catalysis [7]. Amongst the large variety of hydrazones, ferrocenyl hydrazones [8] have a particular interest because of the specific properties of the ferrocene moiety (redox properties, planar chirality.…”

Molecular and Solid State Structure of the Doubly-Substituted B-Diketone 3,3'-Bis(ferrocenylmethyl)pentane-2,4-Dione#

“…7,8 On the other hand, β-diketones are attractive building blocks for the construction of polydentate Schiff bases, and both the parent derivative 2,4-pentanedione (CH 3 COCH 2 COCH 3 ), [9][10][11][12] and its organometallic counterpart ferrocenoylacetone (FcCOCH 2 COCH 3 , 13 Fc = (h 5 -C 5 H 5 )Fe(h 5 -C 5 H 4 )) have been widely employed to prepare tridentate Schiff base complexes, also called half-units, upon mono-condensation with primary diamines. [14][15][16][17][18][19][20][21][22] In pursuit of our research work aimed at extending the scope of acyclic Schiff base metalloligands, [14][15][16][17] we decided to synthetize new β-diketones functionalized at the central carbon of the 1,3-dione system, using cerium(IV) ammonium nitrate (CAN), a versatile reagent in a variety of synthetic transformations through oxidation of organic molecules, [23][24][25] as catalyst in the carbon-carbon bond formation between ferrocenyl alcohol substrates and 1,3-diketones.…”