A Visit to Wittig and Arsa-Wittig Reactions

Bîrzan, Liviu; Cristea, Mihaela; Tecuceanu, Victorița; Drăghici, Constantin; Hanganu, Anamaria; Razus, Alexandru C.

doi:10.37358/rc.20.8.8273

Cited by 2 publications

(1 citation statement)

References 16 publications

(23 reference statements)

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“…Particular importance has been given to the large classes of 1-styrylazulenes, which was achieved by the Wittig reaction, 14 by the Knoevenagel condensation of 1-azulenecarbaldehydes or Schiff bases with active methylene compounds, 7,15 and with barbituric or thiobarbituric acids, rhodanine and thiohydantoin, 16 or by condensation with hippuric and 4-nitrohippuric acids under Erlenmeyer-Plöchl reaction conditions. 17 The presence of the azulen-1-yl moiety that is capable of undergoing anodic polymerization and of a functional group or system with high affinity for cations determines the higher electron density of this second group.…”

Section: Introduction *mentioning

confidence: 99%

Crystal structure and Hirshfeld surface analysis of (Z)-2-phenyl-4-((4,6,8-trimethylazulen-1-yl)methylene)oxazol-5(4H)-one

RĂDUCĂ,

Raț,

CRISTEA

2023

Rev.Roum.Chim.

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The molecular structure of (Z)-2-phenyl-4-((4,6,8-trimethylazulen-1-yl)methylene)oxazol-5(4H)-one (1) was determined single-crystal X-ray diffraction. The crystal presents a monoclinic crystal system, space group P21/n, a = 7.0706(3) Å, b = 18.7978(7) Å, c = 13.7059(7) Å, β = 103.013(5) °, V = 1774.89(14) Å3. In the crystals of 1, are present strong π-π stacking interactions, with an average distance of 3.54 Å between centroids.

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Section: Introduction *mentioning

confidence: 99%

Crystal structure and Hirshfeld surface analysis of (Z)-2-phenyl-4-((4,6,8-trimethylazulen-1-yl)methylene)oxazol-5(4H)-one

RĂDUCĂ,

Raț,

CRISTEA

2023

Rev.Roum.Chim.

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Dancing with Azulene

Razus

2022

Symmetry

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It seems interesting to adopt the idea of dance in the context of the arrangement of molecular blocks in the building of molecular systems. Just as various dances can create various feelings, the nature and arrangement of molecular blocks in the generated molecular system can induce different properties. We consider obtaining such “dancing” systems in which the still little-known azulene moieties are involved. The dark blue nonbenzenoid aromatic azulene has one less axis of symmetry relative to the two axes of its isomer, i.e., the fully benzenoid naphthalene, acquiring valuable properties as a result that can be used successfully in technical applications. In a dancing system, the azulene moieties can be connected directly, or a more or less complex spacer can be inserted between them. Several azulene moieties can form a linear oligomer or a polymer and the involvement of azulene moieties in nonlinear molecules, such as crown ethers, calixarenes, azuliporphyrins, or azulenophane, is a relatively new and intensely studied topic. Some aspects are covered in this review, which are mainly related to obtaining the mentioned azulene compounds and less to their characterization or physico-chemical properties.

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A Visit to Wittig and Arsa-Wittig Reactions

Cited by 2 publications

References 16 publications

Crystal structure and Hirshfeld surface analysis of (Z)-2-phenyl-4-((4,6,8-trimethylazulen-1-yl)methylene)oxazol-5(4H)-one

Crystal structure and Hirshfeld surface analysis of (Z)-2-phenyl-4-((4,6,8-trimethylazulen-1-yl)methylene)oxazol-5(4H)-one

Dancing with Azulene

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