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Related Concept Videos

5-Number Summary01:04

5-Number Summary

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In a dataset, the 5-number summary includes the minimum data value, the data value of the first quartile, the median data value or data value of the second quartile, the data value of the third quartile, and the maximum data value. These 5 data values can be visualized as a box and whisker plot.
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Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

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Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
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meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H01:13

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

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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...
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2° Amines to N-Nitrosamines: Reaction with NaNO2

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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.
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SN2 Reaction: Kinetics02:14

SN2 Reaction: Kinetics

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Kinetic Studies and Significance
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a...
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SN2 Reaction: Mechanism02:27

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The kinetic studies of SN2 reactions suggest an essential feature of its mechanism: it is a single-step process without intermediates. Here, both the nucleophile and the substrate participate in the rate-determining step.
The presence of the more electronegative halogen in the substrate creates a polarized carbon-halide bond. The halide pulls the electron cloud generating an electrophilic center at the carbon atom. Thus, the carbon atom carries a partial positive charge while the halide has a...
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2-Chloro-5-nitro-pyridine.

Seik Weng Ng1

  • 1Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.

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|May 18, 2011
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Summary
This summary is machine-generated.

This study reveals the crystal structure of C(5)H(3)ClN(2)O(2), highlighting molecular planarity and intermolecular interactions. Adjacent molecules form chains via chlorine-oxygen contacts, further organized into layers by carbon-hydrogen bonds.

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Area of Science:

  • Crystallography
  • Solid-state chemistry
  • Molecular structure analysis

Background:

  • Understanding the solid-state packing and intermolecular forces of organic molecules is crucial for predicting material properties.
  • The title compound, C(5)H(3)ClN(2)O(2), presents an interesting case for studying non-covalent interactions due to its functional groups.

Purpose of the Study:

  • To elucidate the crystal structure of C(5)H(3)ClN(2)O(2).
  • To identify and characterize the intermolecular interactions governing the solid-state arrangement.
  • To analyze the planarity of the molecule in the crystalline state.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the three-dimensional structure.
  • Analysis of atomic coordinates and bond lengths/angles to assess molecular geometry.
  • Intermolecular interaction analysis, including distance measurements and hydrogen bond network identification.

Main Results:

  • The non-hydrogen atoms of C(5)H(3)ClN(2)O(2) exhibit near planarity, with an r.m.s. deviation of 0.090 Å.
  • A short chlorine-oxygen (Cl⋯O) contact of 3.068(4) Å was observed between adjacent molecules, leading to chain formation.
  • These chains are further assembled into a layered structure through non-classical C-H⋯O interactions.

Conclusions:

  • The crystal structure of C(5)H(3)ClN(2)O(2) is characterized by a planar molecular framework and specific intermolecular interactions.
  • The observed Cl⋯O contacts and C-H⋯O interactions play a significant role in the self-assembly of molecules into chains and layers.
  • This detailed structural understanding provides insights into the solid-state behavior and potential applications of this compound.