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Related Concept Videos

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

4.6K
Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group. This results in the delocalization of the π electrons over the ring carbons. The resonance interaction between...
4.6K
Predicting Products: SN1 vs. SN202:27

Predicting Products: SN1 vs. SN2

15.9K
Nucleophilic substitution reactions of alkyl halides can proceed via an SN1 or an SN2 mechanism. While in SN2 reactions, the nucleophile attacks the substrate simultaneously as the leaving group departs, in SN1 reactions, the substrate first dissociates to give the carbocation intermediate. Various factors such as the structure of the substrate, the strength of the nucleophile, and the nature of the solvent promote one mechanism over the other.
With increased substitution on the alkyl halide,...
15.9K
SN1 Reaction: Stereochemistry02:15

SN1 Reaction: Stereochemistry

10.1K
This lesson provides an in-depth discussion of the stereochemical outcomes in an SN1 reaction.
In the first step of an SN1 reaction, the bond between the electrophilic carbon and the leaving group ionizes to generate the carbocation intermediate. The second step of the mechanism is the nucleophilic attack.
In the formed carbocation, the positively charged carbon is sp2 hybridized with a trigonal planar geometry. As all the three substituents lie on the same plane, a plane of symmetry for the...
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Related Experiment Videos

The future for SNARC could be stark...

Martin H Fischer1

  • 1Psychology Department, University of Dundee, Dundee, Scotland, UK. m.h.fischer@dundee.ac.uk

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|January 11, 2007
PubMed
Summary
This summary is machine-generated.

The spatial numerical association of response codes (SNARC) effect may not reflect inherent number-space representations. Instead, it might be a result of strategic problem-solving during number tasks.

Related Experiment Videos

Area of Science:

  • Cognitive Psychology
  • Numerical Cognition
  • Neuroscience

Background:

  • The spatial numerical association of response codes (SNARC) effect links number processing with spatial responses.
  • This effect has supported the 'mental number line' metaphor in numerical cognition research.

Purpose of the Study:

  • To critically re-evaluate the interpretation of the SNARC effect.
  • To propose an alternative explanation for spatial biases in numerical tasks.

Main Methods:

  • Conceptual analysis of existing research on the SNARC effect.
  • Discussion of alternative hypotheses regarding cognitive representations of numbers.

Main Results:

  • The SNARC effect might not directly indicate an intrinsic spatial attribute of number representation.
  • Strategic problem-solving could account for the observed spatial biases.

Conclusions:

  • The 'mental number line' metaphor, supported by the SNARC effect, warrants re-examination.
  • Alternative cognitive strategies may underlie numerical task performance.