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  2. Clar's rule - Wikipedia

    en.wikipedia.org/wiki/Clar's_rule

    Clar's rule states that for a benzenoid polycyclic aromatic hydrocarbon (i.e. one with only hexagonal rings), the resonance structure with the largest number of disjoint aromatic π-sextets is the most important to characterize its chemical and physical properties. Such a resonance structure is called a Clar structure. In other words, a ...

  3. Hückel's rule - Wikipedia

    en.wikipedia.org/wiki/Hückel's_rule

    Hückel's rule can also be applied to molecules containing other atoms such as nitrogen or oxygen. For example pyridine (C 5 H 5 N) has a ring structure similar to benzene, except that one -CH- group is replaced by a nitrogen atom with no hydrogen. There are still six π electrons and the pyridine molecule is also aromatic and known for its ...

  4. File:Benzene-resonance-structures.svg - Wikipedia

    en.wikipedia.org/wiki/File:Benzene-resonance...

    The following other wikis use this file: Usage on ar.wikipedia.org كيمياء عضوية; Usage on bn.wikipedia.org জৈব রসায়ন

  5. Resonance (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Resonance_(chemistry)

    Contributing structures of the carbonate ion. In chemistry, resonance, also called mesomerism, is a way of describing bonding in certain molecules or polyatomic ions by the combination of several contributing structures (or forms, [1] also variously known as resonance structures or canonical structures) into a resonance hybrid (or hybrid structure) in valence bond theory.

  6. Cyclohexatriene - Wikipedia

    en.wikipedia.org/wiki/Cyclohexatriene

    Print/export Download as PDF ... move to sidebar hide. Resonance structures of benzene 1,2,3 -Cyclohexatriene ... theoretical resonance isomers of benzene;

  7. Johannes Thiele (chemist) - Wikipedia

    en.wikipedia.org/wiki/Johannes_Thiele_(chemist)

    In 1899 this led to the prediction of the resonance that existed in benzene, and he proposed a resonance structure, by using a broken circle to represent the partial bonds. [7] [8] Later this problem was completely solved with the advent of quantum theory. In 1899, Thiele was head of Organic Chemistry at the Bavarian Academy of Sciences in ...

  8. File:Nitrobenzene resonance.svg - Wikipedia

    en.wikipedia.org/.../File:Nitrobenzene_resonance.svg

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  9. Cation–π interaction - Wikipedia

    en.wikipedia.org/wiki/Cation–π_interaction

    Similar to these other non-covalent bonds, cation–π interactions play an important role in nature, particularly in protein structure, molecular recognition and enzyme catalysis. The effect has also been observed and put to use in synthetic systems. [1] [2] The π system above and below the benzene ring leads to a quadrupole charge distribution.