New Benzo- and Dibenzo-Crown Ethers with (Azulen-1-yl)Vinyl Substituents

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

doi:10.37358/rc.20.12.8381

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“…The dibenzocrown ether 125 was used as a support for the azulene moieties and the connection between them was realized with spacer C=C or N=N bonds, as described in Scheme 22. The bisvinylazulene 124 was achieved via the Wittig route, starting from the dibenzocrown 125, by passing through the dialdehyde intermediary 126 [53]. The bisazoderivatives 127 was produced via diazotization of the intermediate diamine 128 [54].…”

Section: The Dance Of Two or More Azulenes With Various Spacers ("Dan...mentioning

confidence: 99%

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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Section: The Dance Of Two or More Azulenes With Various Spacers ("Dan...mentioning

confidence: 99%