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Preparation of Acid Anhydrides

Preparation of Acid Anhydrides

One of the methods for preparing symmetrical or unsymmetrical acid anhydrides involves the treatment of acid chlorides with the sodium salt of carboxylic acids. The reaction proceeds via a nucleophilic acyl substitution.
The carboxylate ion acts as a nucleophile that attacks the carbonyl carbon of the acid chloride to form a tetrahedral intermediate. Subsequently, the re-formation of the carbonyl group with the loss of the chloride ion as a leaving group leads to the formation of an acid...

Reactions of Acid Anhydrides

Reactions of Acid Anhydrides

The reactions of acid anhydrides are analogous to the reactions of acid chlorides and proceed via a nucleophilic acyl substitution. They only differ in the identity of the leaving group. During an acid chloride reaction, the leaving group is a chloride ion, and the by-product is hydrochloric acid. However, in an acid anhydride reaction, the leaving group is a carboxylate ion, and the by-product is a carboxylic acid.

Determining the pH of Salt Solutions

Determining the pH of Salt Solutions

The pH of a salt solution is determined by its component anions and cations. Salts that contain pH-neutral anions and the hydronium ion-producing cations form a solution with a pH less than 7. For example, in ammonium nitrate (NH4NO3) solution, NO3− ions do not react with water whereas NH4+ ions produce the hydronium ions resulting in the acidic solution. In contrast, salts that contain pH-neutral cations and the hydroxide ion-producing anions form a solution with a pH greater than 7. For...

Acid Halides to Amides: Aminolysis

Acid Halides to Amides: Aminolysis

Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...

Diazonium Group Substitution: –OH and –H

Diazonium Group Substitution: –OH and –H

Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.

Preparation of Amines: Alkylation of Ammonia and Amines

Preparation of Amines: Alkylation of Ammonia and Amines

Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...

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3,4-Dimethyl-anilinium chloride monohydrate.

Sofiane Bouacida, Ratiba Belhouas, Habiba Kechout

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|May 18, 2011

Summary

The crystal structure reveals alternating hydrophobic and hydrophilic layers in dimethyl-anilinium chloride monohydrate. Hydrogen bonds between cations, anions, and water molecules stabilize this ionic crystal structure.

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Area of Science:

Crystallography
Materials Science
Chemical Physics

Background:

Understanding the crystal structure of ionic compounds is crucial for predicting their physical and chemical properties.
Dimethyl-anilinium chloride monohydrate is a compound with potential applications in various fields, necessitating detailed structural analysis.

Purpose of the Study:

To elucidate the detailed crystal structure of dimethyl-anilinium chloride monohydrate.
To investigate the intermolecular interactions, including hydrogen bonding, that govern the compound's structural integrity.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the atomic arrangement.
Analysis of hydrogen bonding networks (N-H⋯O, N-H⋯Cl, O-H⋯Cl) was performed.

Main Results:

The crystal structure exhibits a layered arrangement with hydrophobic dimethyl-anilinium cation layers alternating with hydrophilic chloride anion and water molecule layers.
The layers are interconnected via a network of N-H⋯O and N-H⋯Cl hydrogen bonds involving the ammonium groups.
Further stabilization of the ionic structure is achieved through O-H⋯Cl hydrogen bonding interactions.

Conclusions:

The crystal structure of dimethyl-anilinium chloride monohydrate is characterized by distinct hydrophobic and hydrophilic layers.
Hydrogen bonding plays a critical role in linking these layers and stabilizing the overall ionic framework.
The findings provide fundamental insights into the structure-property relationships of this compound.