Synthesis of heterocyclic carbene ligands via 1,2,3-diheterocyclization of allenylidene complexes with dinucleophiles

“…Elemental analysis: Heraeus CHN-ORapid. Complex 1 was prepared as reported earlier [5,9]. All other chemicals were used as obtained from commercial suppliers.…”

Section: Methodsmentioning

confidence: 99%

Transformation of a Pyrazolidene into a Tetrahydropyrimidinylidene Ligand by Deprotonation/Reprotonation

Szesni

Weibert

Fischer

2006

Zeitschrift Für Naturforschung B

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“…253 A sugar-derived protic CAAC chromium(0) complex has also been obtained by this aminationrecyclization strategy. 254 Annulation of allenylidene complexes with amidines, guanidines, and diamines also affords protic dihydropyrimidin- 4-ylidene complexes, 255,256 as exemplified by the reaction shown in Scheme 61. 255…”

Section: Synthesis Of Protic Cyclic Alkylaminocarbenementioning

confidence: 88%

“…Annulation of allenylidene complexes with amidines, guanidines, and diamines also affords protic dihydropyrimidin-4-ylidene complexes, , as exemplified by the reaction shown in Scheme …”

Section: Synthesismentioning

confidence: 95%

Complexes Bearing Protic N-Heterocyclic Carbene Ligands

2018

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Complexes bearing protic N-heterocyclic carbenes (protic NHCs, pNHCs), defined as cyclic carbenes stabilized by two heteroatoms including at least one NH group, have been less explored in comparison to the conventional N,N'-disubstituted NHCs. The small and reactive NH group of the pNHCs differentiates this class of compounds from the classical NR,NR-NHCs with regard to their properties and reactivity. While the free pNHCs have so far eluded isolation due to isomerization to the azole tautomer, a significant number of transition-metal pNHC complexes have by now been prepared by a variety of methods. This article reviews the coordination chemistry of the pNHCs. Synthetic approaches toward complexes of pNHCs are first described, followed by a discussion of the properties and reactivity of pNHC complexes with emphasis on the Brønsted-acidic nature of the NH wingtip. Involvement of the pNHC ligands in catalytically active intermediates and in cooperative catalysis is also discussed.

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“…Therefore, there is a possibility for the extension of partial delocalisation of π bonds for the C1=N1 and C2=N1 bonds and thus it leads to elongation of the C=N bonds [18]. Thus in this present crystal, the bond order of the C-N bond is longer than of the C-N bonds normally evolved for the pyridine ring.…”

Section: 1crystal Structurementioning

confidence: 62%

Growth, structure, spectral and optical properties of semiorganic crystal: Pyridine-1-ium-2-carboxylatehydrogenbromide

Gowri¹,

Devi²,

Priya³

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Synthesis of heterocyclic carbene ligands via 1,2,3-diheterocyclization of allenylidene complexes with dinucleophiles

Cited by 14 publications

References 62 publications

Transformation of a Pyrazolidene into a Tetrahydropyrimidinylidene Ligand by Deprotonation/Reprotonation

Transformation of a Pyrazolidene into a Tetrahydropyrimidinylidene Ligand by Deprotonation/Reprotonation

Complexes Bearing Protic N-Heterocyclic Carbene Ligands

Growth, structure, spectral and optical properties of semiorganic crystal: Pyridine-1-ium-2-carboxylatehydrogenbromide

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