Huffman elimination. The Huffman elimination takes place when we have different cases. First case. If base is bulky. Base is bulky. For example, now see this base. Base is bulky. If base is bulky, then again see this card please alpha carder. Beta. This is beta 1 and beta 2. These are same. This is different. If we remove that, then get this molecule. If we remove from this side, these are same. Then we have these molecules. This is less substituted alkene. This is more substituted alkene. But you know, as base is bulky, that cannot attack on this hydrogen or rather it attack on least hindered hydrogen. This is why this one is major product and this is minor product. Means least substituted alkene is formed as the major product if base is bulkier. Base is large in size. So, case 1 is when base is bulky, Huffman elimination takes place. So, case number 2. When leaving group is a poor leaving group, then leaving group is a poor leaving group. Like, flooring like flooring and not 3 positive as R 2 positive. So, if leaving group is a poor leaving group like flooring and not 3 positive as R 2 positive. For example, we have 2 fluorobutane with mythoxide ion and we get 2 products because it has 2 types of beta hydrogen. If we remove beta hydrogen from left side, we get with 1 in, if we remove from right side product formed as good to A. This is Huffman product and this is set-ger product. Huffman product is the major product because we have flooring as the leaving group which is a poor leaving group. If leaving group is flooring and not 3 positive or R 2 positive, then Huffman product is dominating over set-ger product. Huffman product is minor product and Huffman product is major product if it is the case. Then, if gamma carbon is crowded, then gamma carbon is heavily substituted. Then, product formed as per Huffman rule. What is the third case when gamma carbon is highly substituted? We have 2 choices. Hydrogen is removed from this side because this is highly crowded. This is Huffman product. This is set-ger product. Huffman product is dominating because gamma carbon is highly substituted. Last case is when beta carbon contains at least one or more than one double bond. Then, product formed as per Huffman rule. See, if we look at it, it has only one hydrogen to hydrogen. According to set-ger rule, double bond should be on this side. But as per Huffman rule, double bond should be on this side as per this double bond. If we remove this hydrogen, then there is now conjugated double bonds. And if we remove, it is from other side. This is isolated double bond. Double bond separated by more than one single bond is isolated double bond and double bond. Now, adjacent to it are called conjugated double bonds. And conjugated dines are more stable than isolated dines. So, this is the major product and this is minor product. This is Huffman elimination. This is set-ger elimination. So, Huffman elimination is dominating over set-ger elimination. These are the 4 cases where Huffman elimination is dominating.