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Related Concept Videos

SN1 Reaction: Stereochemistry02:15

SN1 Reaction: Stereochemistry

10.4K
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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SN1 Reaction: Kinetics02:05

SN1 Reaction: Kinetics

9.6K
In an SN2 reaction, the reaction rate depends on both the type of nucleophile and the substrate. A hindered tertiary alkyl halide is practically inert to the SN2 mechanism despite using a strong nucleophile.
However, Sir Christopher Ingold and Edward D. Hughes, who studied the kinetics of various nucleophilic substitution reactions, noticed that a tertiary alkyl halide does undergo a nucleophilic substitution reaction in the presence of a weak nucleophile. While studying the substitution...
9.6K
SN1 Reaction: Mechanism02:25

SN1 Reaction: Mechanism

14.4K
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...
14.4K
Acidity of 1-Alkynes02:42

Acidity of 1-Alkynes

11.3K

The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.
11.3K
Predicting Products: SN1 vs. SN202:27

Predicting Products: SN1 vs. SN2

17.4K
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,...
17.4K
Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

4.7K
Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
4.7K

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Related Experiment Video

Updated: Feb 11, 2026

Analysis of LINE-1 Retrotransposition at the Single Nucleus Level
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Protocol: a multi-level intervention program to reduce stress in 9-1-1 telecommunicators.

Hendrika Meischke1, Michelle Lilly2, Randal Beaton3

  • 1Northwest Center for Public Health Practice, University of Washington, 1107 NE 45th St. Suite 400, Seattle, WA, 98105, USA.

BMC Public Health
|May 3, 2018
PubMed
Summary
This summary is machine-generated.

This study tested an online mindfulness training and stress reduction toolkit for 9-1-1 telecommunicators (TCs). The intervention effectively reduced self-reported stress symptoms in these critical emergency responders.

Keywords:
9-1-1 dispatcherEmergency medical servicesMindfulnessStress reduction

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Area of Science:

  • Occupational Health
  • Psychology
  • Emergency Services Management

Background:

  • 9-1-1 telecommunicators (TCs) face significant workplace stressors, including crisis calls, overtime, and secondary traumatization.
  • These challenges impact the well-being of TCs, who are essential for emergency response systems.
  • Existing interventions for TC stress reduction are limited.

Purpose of the Study:

  • To evaluate the effectiveness of a multi-part intervention designed to reduce stress in 9-1-1 TCs.
  • To assess the impact of an online mindfulness training and a workplace stressor reduction toolkit.
  • To investigate the potential mediating roles of social work environment and mindfulness in stress reduction.

Main Methods:

  • A randomized controlled trial design with 160 TCs from 9-1-1 call centers.
  • Participants were assigned to an intervention group (mindfulness training + toolkit) or a control group (waitlisted).
  • Data were collected at baseline, post-intervention, and 3-month follow-up using the Calgary Symptoms of Stress Inventory (C-SOSI).

Main Results:

  • The study is designed to measure the primary outcome of self-reported stress symptoms in 9-1-1 TCs.
  • Secondary outcomes include changes in perceptions of the social work environment and levels of mindfulness.
  • Mediation analyses will explore how changes in social support, network conflict, and mindfulness relate to stress reduction.

Conclusions:

  • This study will provide crucial data on the efficacy of a combined online mindfulness and organizational toolkit intervention for 9-1-1 TCs.
  • Findings are expected to contribute to the development of evidence-based stress reduction programs for high-stress occupations.
  • The results will inform strategies to improve the well-being and resilience of emergency telecommunicators.