Can aldehydes react with NaOH? Can aldehydes react with sodium hydroxide?

1) If the aldehyde does not have -H, the disproportionation reaction can occur under alkaline conditions (generally concentrated alkali).

It is a molecule that is oxidized into carboxylic acids.

The other component is reduced to alcohols such as benzaldehyde and neovaleraldehyde.

2 c6h5-cho + naoh --c6h5-coona + c6h5-ch2oh

2) If the aldehyde has -h, the aldol condensation reaction occurs, such as propionaldehyde.

In an alkaline environment, the hydrogen (i.e., -H) on the critical position of the propionaldehyde aldehyde group is removed. The reaction produces -hydroxy ketone.

Yes, aldehydes without -h can undergo a disproportionation reaction under concentrated alkali conditions to produce the corresponding acids and alcohols. (For example, formaldehyde can produce formic acid and methanol).

But only aldehydes without -h can react.

In addition, if the landlord is asking about the acidity of aldehydes, then the hydrogen on the aldehyde group is indeed slightly acidic, but the acidity is very weak, and the alkalinity of sodium hydroxide is far from being able to make it react.

Well, sorry, what I said downstairs is right, aldehydes with -h can be condensed with aldol aldehyde; In addition, what the following said about acidity is also reasonable, but the college entrance examination should generally not involve such a deep assessment of the electron absorption effect, and I think that if -c is only a monohalogen atom substitution, it should not be able to make the acidity so obvious, it can react with Naoh, and the polyhalogen atom substitution is probably still possible o( o

In addition, that. H high school should be involved, that is, the hydrogen atom on the carbon atom closest to the functional group.

I'm a junior in high school this year.

Yes, two molecules can eliminate one water molecule.

Aldehydes and sodium hydroxide can react under certain conditions, and the main types of reactions that occur are as follows:

Disproportionation reaction: The aldehyde group reacts with concentrated sodium hydroxide solution, and the disproportionation reaction of aldehydes can generally occur, and part of the aldehydes are reduced and disproportionated into carboxylates and alcohols. Aldol condensation reaction:

Aldehydes or ketones with a class of groups are catalyzed by alkali to generate carboanions, and then the carbanions are used as nucleophilic reagents to nucleophilic addition of circular taral aldehydes or ketones to generate hydroxyaldehydes containing another group, which is heated and dehydrated to generate unsaturated aldehydes or ketones containing both groups at the same time. Nucleophilic addition: An organic chemistry concept in which an attacking reagent does not have a tendency to acquire electrons, but instead has the ability to donate electrons, such as alcohols, sulfur cavities containing hydrogen bonds, and amine groups that react with alkynes, and it is the oxyalkyl group that provides the electron ability to attack the alkyne bond first.

The aldehyde group and sodium hydroxide can react, which is divided into two situations: 1. In the absence of hydrogen, aldehydes can be disproportionated under alkaline conditions to form acids and alcohols, and the reaction equation is 2RCO+NaOH---RCOONA+RCH2OH, and there is no hydrogen atom on the first C closest to the aldehyde group on R; 2. In the presence of hydrogen, the aldehyde itself undergoes a condensation reaction to form aldol.

What is aldehyde groupAldehyde group refers to a covalent bond in the carbonyl group and hydrogen atom connected to form a monovalent atomic group, its structure is simply -cho, aldehyde group is a hydrophilic group, so the organic matter with aldehyde group (such as acetaldehyde, etc.) has a certain water solubility.

What is sodium hydroxideSodium hydroxide, with the chemical formula NaOH, commonly known as caustic soda, caustic soda, and caustic soda, is a strong alkali with extremely corrosive properties, generally in the form of flakes or blocks. NaOH is a white translucent crystalline solid, which is an essential chemical in chemical laboratories and one of the common chemicals.

Aldehydes and sodium hydroxide can react, and the reaction type is addition reaction. Aldehyde group is a class of functional groups containing carbonyl groups in organic compounds, usually expressed as RCHO. Sodium hydroxide is a strongly basic compound with the chemical formula NaOH.

When the carbonyl carbon atom in the aldehyde group undergoes an addition reaction with the hydroxide ion (OH-) in the sodium hydroxide, alcohol and corresponding salts are formed, for example: RCHO + NaOH RCH(OH)Na + H2O, where RCH(OH)Na represents the hydroxyl group replaces one oxygen atom in the carbonyl group and forms a salt with sodium ions. This blind fibrillary reaction usually needs to be performed under alkaline conditions and can be catalyzed using sodium hydroxide or other alkaline reagents.

The reaction of aldehyde group with hydrogen grinding sodium oxide

1. Reaction mechanism: The reaction between aldehyde group and sodium hydroxide (NaOH) is generally carried out in water. The oxygen atom in the aldehyde group nucleophilically attacks the hydroxyl ion in the sodium hydroxide to form a sodium oxide intermediate and an alcohol.

This intermediate then hydrolyzes and releases a hydroxide ion to form an alcohol and an acidic sodium salt. Among them, water molecules play an important role as solvent and proton acceptors.

2. Reaction conditions: The reaction between aldehyde group and sodium hydroxide usually needs to be heated. In addition, the rate of reaction also depends on the structure of the aldehyde and the sodium hydroxide concentration.

3. Reaction example: Formaldehyde (HCO) reacts with sodium hydroxide to generate methanol (CH3OH) and acidic sodium salt (HCOONA).

1. Compounds containing a -co-ch structure (or can be oxidized into this structure by sodium hypohalide) can react with sodium hydroxide and iodine.

2. The result of the iodoform reaction is to produce iodoform and sodium carboxylate.

3. The equation of acetaldehyde reaction CHO + 3Naio = chi + HCOONA + 2NaOH

The equation for the acetone reaction is ch coch +3naio = chi + ch coona + 2naoh

The equation for the ethanol reaction ch ch oh + 3naio = chi + hcoona + 2naoh + h o

Extended Information: Industrial Acetaldehyde Equation:

2ch₃ch₂oh+o₂→

2CHO + 2Ho (heated, draft guess liter catalyst Cu Ag).

Acetylene hydration method: C H + H o ch cho (catalyst, heating) (is an addition reaction, also a reduction reaction).

Ethylene oxidation method: 2ch = ch + o 2ch cho (catalyst, heating, pressurization).

Acetaldehyde catalytic oxidation: 2ch cho+o

2ch COOH (catalyst, heating).

Acetaldehyde combustion: 2ch cho + 5o 4h o + 4co

Silver mirror reaction: ch cho + 2ag (nh) oh ch coonh + 2ag

3NH + HCO (heating).

Acetaldehyde and freshly made copper hydroxide: CH CHO+2Cu(OH).

CH COOH + Cu O + 2H O (heating) (to generate brick-red Cu O precipitate).

Acetaldehyde and hydrogen react to form ethanol, which is an addition reaction: ch cho + h ch ch oh

Ethanol can be substituted with hydrogen halide to produce halogenated hydrocarbons and water.

General formula: x is halogen).

Note: This reaction is usually carried out by heating a mixture of sodium bromide and a moderate concentration of sulfuric acid with sig-bonded old alcohol, so reddish-brown gas (bromine) is often produced.

<> is divided into two cases:

1. In the absence of hydrogen, the aldehyde group can be disproportionated with the sodium hydroxide solution under alkaline conditions to form acids and alcohols;

2. In the presence of hydrogen, the aldehyde group can condense with the sodium hydroxide solution to form aldoldehyde. The aldehyde group can react with the sodium hydroxide solution.

Aldehyde group: A group of monovalent atoms formed by a covalent bond in a carbonyl group attached to a hydrogen atom. The aldehyde group is a hydrophilic group, so the organic matter with the aldehyde group (such as acetaldehyde, etc.) has a certain water solubility.

The aldehyde group can react with the sodium hydroxide solution. <> is divided into two cases:

1. In the absence of hydrogen, aldehydes can undergo disproportionation reaction to form acids and alcohols under alkaline conditions.

There is no hydrogen atom on the first C closest to the aldehyde group on 2RCOh+NaOH---RCOONA+RCH2OH R.

2. In the presence of hydrogen, aldehyde itself undergoes a condensation reaction to form aldol.

A covalent bond in the carbonyl group is connected to the hydrogen atom and forms a monovalent atomic group, which is called an aldehyde group, the simple formula of the aldehyde group structure is -cho, and the aldehyde group is a hydrophilic group, so the organic matter with the aldehyde group (such as acetaldehyde, etc.) has a certain water solubility. The test method is as follows:

The silver ammonia solution generated by silver nitrate and ammonia contains Ag(NH3)2OH (silver diamine hydroxide), which is a weak oxidant, which can oxidize acetaldehyde into acetic acid under alkaline conditions, and acetic acid reacts with ammonia to form ammonium acetate, and AG is reduced to metallic silver, and the silver generated by heating and reduction is attached to the wall of the test tube to form a silver mirror, so this reaction is also called silver mirror reaction.

The aldehyde group can react with concentrated sodium hydroxide solution; Generally, the disproportionation reaction of aldehydes occurs, and some aldehydes are reduced and some are oxidized

2hcho + oh[-]===ch3oh + hcoo[-]

There is also the aldol condensation reaction: aldehydes or ketones with -h are catalyzed by alkali to generate carboanions, and then the carbanions act as nucleophiles to nucleophiles to add aldehydes or ketones to produce hydroxyaldehydes, which are generated by heating and dehydration - unsaturated aldehydes or ketones.

The aldehyde group can react with concentrated sodium hydroxide solution; Generally, the disproportionation reaction of aldehydes occurs, and some aldehydes are reduced and some are oxidized

2hcho + oh[-]===ch3oh + hcoo[-]

There is also the aldol condensation reaction: aldehydes or ketones with -h are catalyzed by alkali to generate carboanions, and then the carbanions act as nucleophiles to nucleophiles to add aldehydes or ketones to produce hydroxyaldehydes, which are generated by heating and dehydration - unsaturated aldehydes or ketones.