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Related Concept Videos

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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Acid Halides to Amides: Aminolysis01:07

Acid Halides to Amides: Aminolysis

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Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
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SN2 Reaction: Transition State02:26

SN2 Reaction: Transition State

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An SN2 reaction of an alkyl halide is a single-step process in which bond formation between the nucleophile and the substrate and bond breaking between the substrate and the halide occurs simultaneously through a transition state without forming an intermediate.
When the nucleophile approaches the electrophilic carbon with its lone pairs, the halide acts as a leaving group and moves away with the electron-pair bonded to the carbon. Dotted partial bonds represent the bonds being formed or broken...
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SN1 Reaction: Mechanism02:25

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Kinetic studies of ionization of a tertiary halide in a protic solvent suggest that only the substrate participates in the rate-determining step (slow step). The nucleophile is involved only after the slowest step. The SN1 reaction takes place in a multiple-step mechanism. 
Firstly, the haloalkane ionizes to generate a carbocation intermediate and a halide ion. This heterolytic cleavage is highly endothermic with large activation energy. The ionization of the substrate, facilitated by a...
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Rate-Determining Steps03:08

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Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

5.7K
All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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Revealing a Heavy-Atom Assisted Rotation Mechanism in the H + NH2Cl Multi-Channel Reaction.

Yizhuo Chen1,2, Zhao Tu2, Jiaqi Li2

  • 1College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China.

The Journal of Physical Chemistry. A
|March 12, 2025
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Summary
This summary is machine-generated.

Researchers identified novel atomic-level mechanisms in the H + NH2Cl reaction using advanced computational methods. A unique "heavy-atom assisted rotation" mechanism was discovered, influencing product scattering.

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Area of Science:

  • Chemical Dynamics
  • Atmospheric Chemistry
  • Computational Chemistry

Background:

  • Understanding elemental chemical reactions at the atomic level is essential for complex process elucidation.
  • The H + NH2Cl reaction is significant in environmental science, necessitating detailed mechanistic studies.

Purpose of the Study:

  • To identify atomic-level mechanisms governing the multichannel H + NH2Cl reaction.
  • To construct a globally accurate potential energy surface for the reaction system.
  • To investigate novel reaction pathways and product scattering distributions.

Main Methods:

  • High-level ab initio calculations (UCCSD(T)-F12a/aug-cc-pVTZ) were employed to determine reaction pathways.
  • A full-dimensional potential energy surface was constructed by fitting 143,333 ab initio energy points.
  • Quasi-classical trajectory calculations were used to visualize and identify atomic-level reaction mechanisms.

Main Results:

  • Seven distinct reaction pathways and three product channels (H2 + NHCl, HCl + NH2, Cl + NH3) were identified.
  • A novel 'heavy-atom assisted rotation' mechanism was discovered in this light-heavy-heavy reaction.
  • This mechanism involves rotational motion of heavy atoms (Cl or N) propelling the light H atom, leading to unique forward and sideward product scattering.

Conclusions:

  • The study elucidates the detailed atomic-level mechanisms of the H + NH2Cl reaction.
  • The discovery of the 'heavy-atom assisted rotation' mechanism provides new insights into chemical reaction dynamics.
  • Findings contribute to a deeper understanding of environmental chemical processes involving this reaction.