Cooper, D. L.; Gerratt, J.; Raimondi, M. In: The Spin-Coupled Description of Aromatic, Antiaromatic, and Nonaromatic Systems, Pauling's Legacy: Modern Modelling of the Chem- ical Bond. Vol. 6. Elsevier: Amsterdam, 1999, p. 503....
cyclobutadiene and the cyclopentadiene cation are interesting in that they areunusually unstable.This is a property called “antiaromaticity”, which we will describe in some detail in the next post.
The BBAH shows that, contrary to aromatic (4n+2 Hückel) and nonaromatic molecules, antiaromatic molecules (4n Hückel) have adjacent double bonds that cannot conjugate through antiperiplanar electronic delocalization.doi:10.1016/j.tet.2021.132161Pierre Deslongchamps...
In general, antiaromatic compounds are thermodynamically and/or kinetically unstable - in fact they generally aren't observed in nature: usually they relax to a more stable, nonaromatic state by buckling or making some other structural modification. The classic example of this is cyclo-octatetraene ...
:(1)非芳香族性(non-aromatic)构造,可使193nm之光源穿透光阻层;(2)脂环族(alicyclic)的构造,可以增加光阻之抗蚀刻能力;… www.ndl.org.tw|基于3个网页 2. 非芳香族 十、试分类下列分子或离子为芳香族(aromatic)、非芳香族(non-aromatic)或是反芳香族(anti-aromatic)化合物,并解释 … ...
hyperconjugation and push鈥損ull effect via density functional theory calculations, highlighting the importance of transition metals in hyperconjugative aromaticity and demonstrating a particularly useful strategy for the design of aromatic and antiaromatic counterparts based on a nonaromatic parent species. ...
In the 2π systems, although the 4n+2 π electron count suggests aromaticity and hence diatropicity, the π orbital is magnetically inactive, as in the Al42− dianion. However, in the 4π formally antiaromatic systems, the π-like HOMO supports an additional paratropic current. ...
Antiaromatic or Nonaromatic? 2 1 H ,6 1 H -2,6(2,5)-Dipyrrola-1,5(2,6)-dipyridinacyclooctaphane-3,7-diene: a Porphycene Derivative with 4 N π Electrons A porphycene-derived compound with a 20 蟺-electron skeleton has been obtained by replacing two pyrrolene units of porphycene...
Define non-aromatic. non-aromatic synonyms, non-aromatic pronunciation, non-aromatic translation, English dictionary definition of non-aromatic. Adj. 1. non-aromatic - not aromatic inodorous, odorless, odourless - having no odor; "odorless gas"; "odorles
electrons conjugation, and we get to see fully filled orbits as compared to antiaromatic compounds with just (4n) π electrons. this makes the compound very reactive. apart from this, aromatic compound are differentiated from similar nonaromatic compounds by the level of susceptibility. the ...