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23 Φεβ 2017 · In this post we go through the rules for aromaticity: the four key conditions a molecule must fulfill if it is to be aromatic, with lots of examples.
So what are the rules? How can we predict whether a molecule is aromatic or not? Table of Contents. Four Key Rules for Aromaticity. Condition #1 for Aromaticity: The Molecule Must Be Cyclic. Condition #2: Every atom in the ring must be conjugated. Condition #3: The Molecule Must Have [4n+2] Pi Electrons. Which Electrons Count As “Pi Electrons”?
23 Ιαν 2023 · Four illustrative examples of aromatic compounds are shown above. The sp 2 hybridized ring atoms are connected by brown bonds, the π-electron pairs and bonds that constitute the aromatic ring are colored blue.
4 Criteria for Determining Aromaticity. Look for the following 4 criteria to identify aromatic compounds. I like to write a quick ‘checklist’ next to the molecule, or do a mental checklist when pressed for time. 4 checks = aromatic. Cyclic; Planar; Conjugated; Huckel’s Rule
Let’s look at several examples to see how the Hückel 4n + 2 rule works. Cyclobutadiene has four π electrons and is antiaromatic. As indicated by the electrostatic potential map, the π electrons are localized in two double bonds rather than delocalized around the ring.
Four Criteria for Aromaticity. When deciding if a compound is aromatic, go through the following checklist. If the compound does not meet all the following criteria, it is likely not aromatic. The molecule is cyclic (a ring of atoms) The molecule is planar (all atoms in the molecule lie in the same plane)
Let’s look at several examples to see how the Hückel 4n + 2 rule works. Cyclobutadiene has four π electrons and is antiaromatic. As indicated by the electrostatic potential map, the π electrons are localized in two double bonds rather than delocalized around the ring.
