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23 Φεβ 2017 · 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”?
we take our talents and explore Aromatic Compounds and how we go about performing reactions with them—namely with benzene. But before we get into learning new reactions and mechanisms, let’s make sure we completely understand how to identify aromaticity and what being aromatic entails. 1.)
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”?
3 Μαρ 2017 · Aromatic vs Antiaromatic vs Non Aromatic Practice Exercises. Our last post in this series on aromaticity went through the 4 conditions a molecule must fulfill in order to be aromatic. First, it must be cyclic; Second, every atom around the ring must have an available p-orbital
Taking a break from synthesis, here are a few other problems I wanted to include in the last worksheet but pushed to this one (in the interest of worksheet length). The structure shown below has a very low pKa, ~0. Justify this structure’s acidity. Rank the following three structures from most to least basic.
AROMATICS 1. 1. Benzene is represented as structure B rather than structure A. Explain how data from enthalpies of hydrogenation supports structure B rather than structure A. Explain why benzene has structure B rather than structure A.
Count the number of pi electrons in each molecule. Remember, anions are counted as 2 pi electrons, cations as 0 pi electrons, and radicals as 1 pi electron. Set the total number of pi electrons for each molecule equal to 4n+2 and solve for n. In order for the compound to be aromatic, n must be a whole number.
