What is the elimination reaction?

The reaction in which an organic compound removes a small molecule (such as water, hydrogen halide, etc.) from one molecule under appropriate conditions to form an unsaturated (carbon-carbon double or triple bond) compound is called a elimination reaction. Alcohols and halogenated hydrocarbons can be eliminated. The conditions under which the elimination reaction occurs:

In the alcohol molecule, the carbon atom with the hydroxyl group (-OH) must have adjacent carbon atoms and the adjacent carbon atom must also have hydrogen atoms attached to the adjacent carbon atom before the elimination reaction can occur and form an unsaturated bond. The carbon atom connecting the functional group is in place, and the adjacent carbon atom is in place, and the elimination reaction of a small molecule is also called the -elimination reaction.

Eliminate reactionsIt refers to the loss of two groups (see groups) or atoms of the reactant molecule, thereby raising itUnsaturationreactions.

Alcohols and halogenated hydrocarbons can be eliminated.

In the alcohol molecule, the carbon atom with the hydroxyl group (OH) must have an adjacent carbon atom and a hydrogen atom attached to it.

, the elimination reaction can occur.

There are two situations of the elimination reaction, one is that the halogenated hydrocarbons undergo the elimination reaction under the alcohol solution of NaOH to form olefins.

The other is alcohol in concentrated sulfuric acid.

olefins are formed.

Note: 1. The elimination reaction is a decomposition reaction. The elimination reaction is a reaction in which one molecule becomes two molecules, and is therefore a decomposition reaction.

2. The elimination reaction is an intramolecular reaction, and the reaction between molecules to form small molecules is not an elimination reaction. That is, the part that disappears within a molecule detachs itself in molecular form.

3. The result of the elimination reaction is to increase the degree of unsaturation of organic matter.

4. Elimination reaction and addition reaction.

Reactions that are carried out in the opposite direction of each other, but are not reversible reactions if the reaction conditions are different.

5. Concentrated sulfuric acid is generally used as a catalyst to remove the hydroxyl group of alcohols to form organic matter containing double bonds. It should be noted that the temperature control of the alcohol elimination reaction will be low, and the by-product ether will be formed when the temperature is low (140), and the elimination reaction will only occur when the temperature reaches a certain range (170). The essence of the elimination reaction is that the hydroxyl group and an H atom on the site are jointly removed to form H2O, so the alcohols that can undergo the elimination reaction must have H atoms.

6. If there are more than one ortho-carbon of the hydroxyl linked carbon, and all of them have hydrogen atoms, the hydrogen atoms on the ortho-carbon with fewer hydrogen atoms are eliminated.

Eliminate the reactionGenerally refers to:Eliminate reactions

Elimination reaction refers to an organic reaction in which the molecules of the organic pulse source compound react with other substances in the cavity and lose part of the atoms or functional groups. After the elimination reaction takes place, the molecules that form the reaction will produce multiple bonds, which are unsaturated organic compounds. The elimination reaction causes the reactant molecule to lose two groups (see group) or atoms, thereby increasing its unsaturation ground state.

Eliminate the conditions of the reaction

1. Alcohol elimination reaction: the reaction condition is concentrated sulfuric acid.

The carbon atom that is heated and attached to the hydroxyl group (-OH) must have an adjacent carbon atom and this adjacent carbon atom must contain a hydrogen atom.

Otherwise, it will not be able to react.

2. Elimination reaction of halogenated hydrocarbons: the condition is sodium hydroxide.

The alcohol solution and the carbon atom attached to the halogen atom must have an adjacent carbon atom and this adjacent carbon atom must contain a hydrogen atom on it, otherwise the reaction cannot be achieved.

The above content reference: Encyclopedia - Elimination Reaction.

Elimination reaction: It refers to the reaction of organic compounds to remove small molecule substances (such as H2O, HBR, etc.) under certain conditions to form compounds with double bonds or three healthy molecules in the molecule, which is called elimination reaction.

Common functional groups and conditions that can eliminate reactive substances:

1. Alcohol (hydroxyl group), concentrated sulfuric acid, heating-removal of H2O.

2. Halogenated hydrocarbons (halogen atoms), alkali alcohol solution, heating-removal of HX.

Elimination Reaction Classification:

Elimination reactions are classified by the relative position of the two lost groups in the molecule and can be divided into the following three categories:

1. - Elimination.

Elimination, also known as 1,2-elimination, is a reaction in which two groups on adjacent atoms are lost and a bond (see covalent bond) is formed between the two atoms. If both atoms in the phase bend are carbon atoms, the alkene elimination reaction will occur.

2. - Elimination.

Elimination, also known as 1,1-elimination, is a reaction in which two groups on the same atom are lost to form an uncharged low-valent structure (such as carbene or nitrone). , 3 - elimination.

1,3- elimination is a reaction in which two groups attached to 1,3- or more relative positions are eliminated to obtain a cyclic product. These reactions can also be seen as intramolecular substitution reactions.

The above content refers to Encyclopedia - Elimination Reaction.

The elimination reaction refers to the reaction in which the organic matter is removed from the small molecule under certain conditions to form unsaturated organic matter containing double bonds in the molecule. The elimination reaction is called the elimination reaction or the removal reaction, which is an organic reaction. The molecule after the reaction will produce multiple bonds.

There are two types of elimination reactions:

Elimination reaction: more common, generally forming alkenes.

Elimination reaction: Carbenees are generated. The carbon connected to the departing base is carbon, the hydrogen on it is hydrogen, and the adjacent carbon and hydrogen are carbon and hydrogen.

Compounds will lose the hydrogen atom known as the elimination reaction and will lose the hydrogen atom called the elimination reaction.

Elimination reactions are reactions in which the reactants deciliter repent lose two groups or atoms, thereby increasing their unsaturation.