#markovnikov's rule

[johnkarnes]

[md-science-blog]

Word of the day: Markovnikov's Rule

A rule for predicting the regiochemistry of electrophilic additions to alkenes and alkynes that can be states in various ways.

As originally stated (in 1870) by Vladimir Markovnikov, the rule provides that "if an unsymmetrical alkene combines with a hydrogen halide, the halide ion adds to the carbon with the fewer hydrogen atoms"

More commonly the rule has been stated in reverse: that in the addition of HX (the H stands for Hydrogen and the X stands for an atom or element) to an alkene or alkyn the hydrogen adds to the carbon atom that already has the greater number of hydrogen atoms

Modern definition to the rule is: In the ionic addition of an unsymmetrical reagent to a multiple bond, the positive portion of the reagent (the electrophile or Lewis acid) attaches itself to a carbon atom of the reagent in the way that leads to the formation of the more stable intermediate carbocation (Carbon atom with a positive charge)

click here to watch the video about it. I hope this would give you a clear understanding about it. The reason why I picked this word because I am currently learning about and I am struggling a little about it. Chemistry is NOT my best friend. 

Source of the definition: Organic Chemistry 10th Ed. by T.W. Graham Solomons and Craig B. Fryhle. Copy Right 2011.

[nachoviv]

When the title of your next OWL is called "Electrophilic Addition: Propene Hydrochlorination"

you know your night just got a lot worse