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Related Concept Videos

Structures of Carboxylic Acid Derivatives01:28

Structures of Carboxylic Acid Derivatives

Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the unhybridized p...
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The z-transform is a powerful mathematical tool used in the analysis of discrete-time signals and systems. It is an essential analytical tool, analogous to the Laplace transform used in continuous-time systems. It plays a crucial role in the analysis of signals and systems, complementing the discrete-time Fourier transform. Both the z-transform and the Laplace transform convert differential or difference equations into algebraic equations, simplifying the process of solving complex problems.
Isomerism in Alkenes02:01

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One of the critical aspects of the E1 reaction mechanism, as also observed in E2, is the regiochemistry, with multiple regioisomers obtained as products. In the example discussed, the presence of water as a weak base favors elimination over substitution to generate two alkenes. Given that alkenes’ stability increases with the number of alkyl groups across the double bond, typically, E1 reactions lead to the Zaitsev product, for this is more substituted and stable than the Hofmann product.

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Quinoxaline: Z' = 1 form.

Sathishkumar Ranganathan1, Sudarshan Mahapatra, Tejender S Thakur

  • 1Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, Karnataka, India.

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

Researchers discovered a new crystal structure for quinoxaline, a nitrogen-containing aromatic compound. This novel Z = 1 structure is significantly smaller than previously known forms, achieved using in situ cryocrystallization.

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Area of Science:

  • Crystallography
  • Materials Science
  • Organic Chemistry

Background:

  • Quinoxaline (1,4-diaza-naphthalene) is an important heterocyclic aromatic compound.
  • Previous studies identified a Z = 5 crystal structure for quinoxaline.
  • Understanding different crystal structures is crucial for materials science applications.

Purpose of the Study:

  • To obtain and characterize a new crystal structure of quinoxaline.
  • To investigate the possibility of lower Z' crystal forms.
  • To compare the new structure with previously reported forms.

Main Methods:

  • In situ cryocrystallization technique.
  • Single-crystal X-ray diffraction analysis.
  • Crystallographic data collection and refinement.

Main Results:

  • A new crystal structure of quinoxaline with Z = 1 was successfully obtained.
  • The new Z = 1 structure has one-fifth the volume of the previously known Z = 5 structure.
  • The crystallographic data for the new structure were determined.

Conclusions:

  • The existence of a lower Z' crystal structure for quinoxaline has been confirmed.
  • In situ cryocrystallization is an effective method for discovering new crystal forms.
  • This finding expands the understanding of quinoxaline's solid-state chemistry.