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Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

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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.
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Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction...
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Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is...
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Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism01:10

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Cyanohydrins are formed when cyanide nucleophiles and carbonyl compounds like aldehydes and ketones react. A strong base, the cyanide ion, catalyzes cyanohydrin formation. The ions are generated from HCN under aqueous conditions. Once the cyanide ions are generated, the first step involves the nucleophilic attack of the cyanide ions on the electrophilic carbonyl carbon. This attack shifts the π electrons from the C=O to the oxygen atom forming the alkoxide ion intermediate. The alkoxide anion...
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Wolff–Kishner reduction involves converting aldehydes and ketones to alkanes using hydrazine and a base. The reaction converts a carbonyl group to a methylene group. The method was independently discovered by N. Kishner in 1911 and L. Wolff in 1912. The reduction is carried out in high-boiling solvents such as ethylene glycol and diethylene glycol because heat is required to deprotonate the N–H proton in one of the reaction steps.                                       ...
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An alkene, such as propene, reacts with bromine in the presence of water to yield a halohydrin. Halohydrins contain a halogen and a hydroxyl group attached to adjacent carbons. When the halogen is bromine, it is called a bromohydrin, while a chlorohydrin has chlorine as the halogen.
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    This study details the crystal structure of a key compound (C(7)H(6)N(4)O(4)) used in synthesizing biologically active molecules. Its molecular arrangement and hydrogen bonding are crucial for its role in chemical synthesis.

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    Area of Science:

    • Organic Chemistry
    • Crystallography
    • Medicinal Chemistry

    Background:

    • The title compound, C(7)H(6)N(4)O(4), is a significant precursor in the synthesis of various biologically active compounds.
    • Understanding the precise molecular structure and intermolecular interactions is vital for optimizing synthetic pathways and predicting compound properties.

    Purpose of the Study:

    • To elucidate the crystal structure of the title compound, C(7)H(6)N(4)O(4).
    • To analyze the spatial orientation of the hydrazone group relative to the benzene ring.
    • To identify and describe the intermolecular hydrogen bonding network within the crystal lattice.

    Main Methods:

    • Single-crystal X-ray diffraction was employed to determine the three-dimensional structure of the compound.
    • Crystallographic data were analyzed to obtain bond lengths, bond angles, and dihedral angles.
    • Intermolecular interactions, specifically hydrogen bonds, were identified and characterized.

    Main Results:

    • The crystal structure reveals a planar hydrazone group with a specific dihedral angle of 8.27(3)° relative to the benzene ring.
    • The compound crystallizes in a lattice held together by intermolecular hydrogen bonds.
    • Both N-H⋯O and N-H⋯N hydrogen bonds were observed, indicating a well-defined supramolecular architecture.

    Conclusions:

    • The determined crystal structure provides fundamental insights into the molecular geometry and intermolecular forces of C(7)H(6)N(4)O(4).
    • This structural information is essential for its application in the synthesis of biologically active compounds.
    • The identified hydrogen bonding patterns can influence the compound's reactivity and solid-state properties.