aromaticity

“Is This Molecule Aromatic?” Some Practice Problems

“Is This Molecule Aromatic?” Some Practice Problems

March 3, 2017

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 T…

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Rules For Aromaticity

Rules For Aromaticity

February 23, 2017

In the last post we introduced the concept of aromaticity, a property of some unusually stable organic molecules such as benzene. Although some aromatic molecules are indeed fragrant (hello, vanillin! ) the term &#…

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Introduction To Aromaticity

Introduction To Aromaticity

January 20, 2017

The Highly Anomalous Behavior of “Cyclohexatriene” Scene: a plane full of passengers are flying over the Atlantic ocean. Halfway through the flight, there’s suddenly a loud THUNK from outside t…

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Khan Academy for Organic Chemistry – Part 5

Khan Academy for Organic Chemistry – Part 5

October 23, 2012

IN this post (the 5th of 6) we go through videos 52-64 of Khan Academy for Organic Chemistry, covering mostly aromatic compounds and aldehydes/ketones. [For previous posts, see Part 1, Part 2, Part 3, Part 4] Video #5…

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What does 4n+2 mean?

What does 4n+2 mean?

June 29, 2012

The other night a student came to me with a question about aromaticity. “There’s one thing I don’t get”, she said. “They say a molecule has to have 4n+2 electrons. How do you find n?̶…

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7 Factors That Stabilize Positive Charge in Organic Chemistry

7 Factors That Stabilize Positive Charge in Organic Chemistry

March 7, 2012

Just to clarify: make sure you’re familiar with how formal charge can lie before you read this. These factors determine the stability of “true” positive charges (i.e. low electron densities), not …

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Reaction Friday: Friedel Crafts Acylation

Reaction Friday: Friedel Crafts Acylation

March 2, 2012

Today’s Reaction Friday is about the Friedel Crafts acylation of benzene and other aromatics, an important example of electrophilic aromatic substitution. One thing I forgot to say at the bottom is that there…

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What To Expect In Organic Chemistry 2

What To Expect In Organic Chemistry 2

January 19, 2011

A large part of organic chemistry 1 is devoted to laying the foundations: introducing structural concepts such as bonding, geometry, stereochemistry, conformations, resonance, and steric effects, while introducing con…

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The Six Pillars of Organic Chemistry

The Six Pillars of Organic Chemistry

August 25, 2010

A few weeks ago Jeremy at The Chemistry Blog wrote a post called  “Common Student Difficulties in Organic Chemistry”. Since I was flying home for vacation at the time, I missed out  the discussion, but b…

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