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IUPAC Nomenclature of Aldehydes01:16

IUPAC Nomenclature of Aldehydes

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Aldehydes are named based on the systematic nomenclature rules set by the IUPAC. For acyclic aldehydes, the longest carbon chain containing the aldehydic (–CHO) group is considered the parent chain. The aldehyde is named by replacing the last letter “e” in the hydrocarbon name with “al”. For instance, a simple, seven-carbon-membered acyclic aldehyde is called heptanal, derived from heptane. The carbon chain is numbered starting from the aldehydic carbon, although...
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Diazonium Group Substitution: –OH and –H01:19

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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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Preparation of Diols and Pinacol Rearrangement01:57

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Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
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Nomenclature of Alkynes02:39

Nomenclature of Alkynes

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Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:
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Prochirality02:05

Prochirality

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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
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1-(Prop-2-yn-yl)indoline-2,3-dione.

Fatima-Zahrae Qachchachi1, Fouad Ouazzani Chahdi1, Houria Misbahi2

  • 1Laboratoire de Chimie Organique Appliquée, Université Sidi Mohamed Ben Abdallah, Faculté des Sciences et Techniques, Route d'Immouzzer, BP 2202 Fès, Morocco.

Acta Crystallographica. Section E, Structure Reports Online
|April 26, 2014
PubMed
Summary

This study details the crystal structure of C11H7NO2, revealing a coplanar indoline ring and carbonyl groups. Molecules form a 3D network via hydrogen bonds and pi-pi interactions.

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Area of Science:

  • Crystallography
  • Organic Chemistry
  • Materials Science

Background:

  • Understanding molecular structure is crucial for predicting material properties.
  • Isotypic structures can offer insights into bonding and packing in related compounds.

Purpose of the Study:

  • To elucidate the crystal structure of the title compound, C11H7NO2.
  • To analyze the molecular geometry, including planarity and torsion angles.
  • To investigate intermolecular interactions within the crystal lattice.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the atomic arrangement.
  • Analysis of bond lengths, angles, and torsion angles provided geometric details.
  • Identification of hydrogen bonds and π-π interactions characterized the crystal packing.

Main Results:

  • The compound C11H7NO2 exhibits an isotypic structure with 1-octylindoline-2,3-dione.
  • The indoline ring and carbonyl oxygens are nearly coplanar (max deviation 0.021 Å).
  • The propynyl group is nearly perpendicular to the fused ring system (torsion angle 77.9°).
  • Molecules are interconnected by C-H⋯O hydrogen bonds and benzene ring π-π interactions (inter-centroid distance 3.5630 Å).

Conclusions:

  • The crystal structure of C11H7NO2 is characterized by a specific molecular conformation and arrangement.
  • Intermolecular forces, including hydrogen bonding and π-π stacking, dictate the formation of a robust three-dimensional network.
  • The findings contribute to the understanding of structure-property relationships in organic crystalline materials.