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Related Concept Videos

Phase II Reactions: Methylation Reactions01:17

Phase II Reactions: Methylation Reactions

Methylation is a phase II biotransformation process involving the attachment of a methyl group to a substrate. Enzymes known as methyltransferases orchestrate this reaction.
The mechanism of methylation unfolds in two stages. The first stage sees a methyltransferase enzyme facilitating the transfer of a methyl group from S-adenosylmethionine (SAM) to the substrate, forming S-adenosylhomocysteine (SAH). The second stage involves further metabolism of SAH into homocysteine, which can be recycled...
Nomenclature of Carboxylic Acid Derivatives: Amides and Nitriles01:11

Nomenclature of Carboxylic Acid Derivatives: Amides and Nitriles

Naming Amides
The IUPAC and common names of amides are derived from the parent carboxylic acid, by replacing the suffix “oic acid” and “ic acid,” respectively, with “amide.” In the following example, the IUPAC name ethanamide is derived from ethanoic acid, and the common name, acetamide, is obtained from acetic acid.
2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
Antiasthma Drugs: Methylxanthines01:24

Antiasthma Drugs: Methylxanthines

Theophylline, a member of the methylxanthine class of bronchodilators, has long been used in asthma management. While its exact mechanism of action is not fully understood, it is believed to have multiple effects on various cellular processes.
Theophylline is thought to inhibit phosphodiesterase enzymes, increasing intracellular levels of cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP). This rise in cAMP and cGMP concentrations stimulates cardiac function,...
meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H01:13

meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H

All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for the...
Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacokinetics01:11

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacokinetics

All neuromuscular blocking agents are injected intravenously because they are poorly absorbed from the GI tract. Rapid onset is achieved with intravenous administration, although absorption is also adequate from an intramuscular injection. Since these agents are highly ionized, they do not readily penetrate cell membranes or cross the blood-brain barrier.
Instead, they are transported by the blood to different tissues. Muscles with a greater blood supply (arteries) and blood flow receive more...

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Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives
08:43

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Published on: January 19, 2016

Methyl 4-isonicotinamido-benzoate monohydrate.

Yang Zhang1, Xiao-Li Zhao

  • 1Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online
|May 19, 2011
PubMed
Summary

This study details the synthesis and crystal structure of a novel methyl 4-isonicotinamido-benzoate hydrate. The compound exhibits a planar structure with specific hydrogen bonding, forming unique double-chain ribbons in its crystalline state.

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Area of Science:

  • Crystallography
  • Organic Chemistry
  • Materials Science

Background:

  • Understanding molecular interactions is crucial for designing new materials.
  • Crystal engineering utilizes intermolecular forces to control solid-state structures.
  • Benzoate derivatives and pyridine compounds are important in various chemical applications.

Purpose of the Study:

  • To synthesize and characterize a novel hydrate of methyl 4-isonicotinamido-benzoate.
  • To elucidate the crystal structure and intermolecular interactions of the title compound.
  • To investigate the formation of hydrogen-bonded networks in the solid state.

Main Methods:

  • Chemical synthesis involving methyl 4-amino-benzoate and isonicotinoyl chloride hydrochloride.
  • Single-crystal X-ray diffraction to determine the molecular and crystal structure.
  • Analysis of hydrogen bonding (N-H⋯O, O-H⋯N, O-H⋯O) and molecular geometry.

Main Results:

  • The title compound, C(14)H(12)N(2)O(3)·H(2)O, was successfully synthesized.
  • The crystal structure revealed a relatively planar molecule with a pyridine ring inclined at 7.46° to the benzene ring.
  • Molecules are interconnected by water molecules via hydrogen bonds, forming a double-chain ribbon-like supramolecular structure.

Conclusions:

  • The synthesis yielded a novel methyl 4-isonicotinamido-benzoate hydrate.
  • The crystal structure demonstrates specific molecular packing driven by hydrogen bonding.
  • The observed double-chain ribbon structure highlights potential for designing ordered supramolecular architectures.