SAYTZEFF RULE PDF

A double bond is formed due to loss of water molecule. It is an elimination reaction. According to Saytzeff's rule also known as Zaitsev's rule , during dehydration, more substituted alkene olefin is formed as a major product, since greater the substitution of double bond greater is the stability of alkene. Now the loss of H 2 O creates a positive charge on the carbon atom and thus by forming a tertiary carbocation. Hence three different alkenes are possible.

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Elimination Reaction for some alcohols and alkyl halides will result in different alkene products, and Saytzeff or Zaitsev Rule is used to determine the major product. Saytzeff or Zaitsev Rule states that the more substituted alkene will be the major product. So by looking at the number of alkyl groups attached to the alkene, the degree of substitution and hence major and minor products can be determined.

We notice that when bromine is eliminated from carbon-2, we can either remove a neighbouring hydrogen from carbon-1 or carbon Therefore 2 different alkene products, butene and butene can be formed.

To determine which is the major product, we have to figure out the degree of substitution for each alkene. To make it easier to visualise, we can box up the alkene and count the number of alkyl groups attached to the alkene. For butene we notice it has only 1 alkyl group attached to the alkene.

It is less substituted hence the minor product. For butene, it has 2 alkyl groups attached to the alkene. It is more substituted therefore the major product.

For a step-by-step guide to predict the major product using Saytzeff Rule, check out this video lesson now! I have a huge collection of short video lessons that targets important H2 Chemistry concepts and common questions. Follow me on Instagram for H2 Chemistry videos and not so funny memes! My weekly classes in Singapore are ideal for students who prefer a more structured program.

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2.4: Hofmann’s Rule and Zaitsev’s Rule

Elimination Reaction for some alcohols and alkyl halides will result in different alkene products, and Saytzeff or Zaitsev Rule is used to determine the major product. Saytzeff or Zaitsev Rule states that the more substituted alkene will be the major product. So by looking at the number of alkyl groups attached to the alkene, the degree of substitution and hence major and minor products can be determined. We notice that when bromine is eliminated from carbon-2, we can either remove a neighbouring hydrogen from carbon-1 or carbon Therefore 2 different alkene products, butene and butene can be formed. To determine which is the major product, we have to figure out the degree of substitution for each alkene. To make it easier to visualise, we can box up the alkene and count the number of alkyl groups attached to the alkene.

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Zaitsev's rule

Zaitsev's rule or Saytzeff's rule , Saytzev's rule is an empirical rule for predicting the favored alkene product s in elimination reactions. While at the University of Kazan , Russian chemist Alexander Zaitsev studied a variety of different elimination reactions and observed a general trend in the resulting alkenes. Based on this trend, Zaitsev stated, "The alkene formed in greatest amount is the one that corresponds to removal of the hydrogen from the alpha-carbon having the fewest hydrogen substituents. More generally, Zaitsev's rule predicts that in an elimination reaction, the most substituted product will be the most stable, and therefore the most favored. The rule makes no generalizations about the stereochemistry of the newly formed alkene, but only the regiochemistry of the elimination reaction.

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