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SN1 Reaction: Stereochemistry

S_N1 Reaction: Stereochemistry

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...

SN1 Reaction: Kinetics

S_N1 Reaction: Kinetics

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...

SN1 Reaction: Mechanism

S_N1 Reaction: Mechanism

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...

Acidity of 1-Alkynes

Acidity of 1-Alkynes

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.

Predicting Products: SN1 vs. SN2

Predicting Products: S_N1 vs. S_N2

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,...

Preparation of 1° Amines: Gabriel Synthesis

Preparation of 1° Amines: Gabriel Synthesis

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...

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Related Experiment Video

Updated: Jan 25, 2026

Growing Magnetotactic Bacteria of the Genus Magnetospirillum: Strains MSR-1, AMB-1 and MS-1

Growing Magnetotactic Bacteria of the Genus Magnetospirillum: Strains MSR-1, AMB-1 and MS-1

Published on: October 17, 2018

Trouble With Tribbles-1.

Kavita S Jadhav¹, Robert C Bauer¹

¹From the Cardiometabolic Genomics Program, Division of Cardiology, Department of Medicine, Columbia University Medical Center, New York.

Arteriosclerosis, Thrombosis, and Vascular Biology

|April 26, 2019

Summary

This summary is machine-generated.

Genome-wide association studies reveal the TRIB1 gene at the 8q24 locus is linked to plasma lipids and coronary artery disease. Further research is needed to understand TRIB1

Keywords:

atherosclerosis cholesterol coronary artery disease genome-wide association study lipid metabolism

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Area of Science:

Genetics
Cardiovascular Disease Research
Molecular Biology

Background:

Genome-wide association studies (GWAS) have identified numerous genetic loci associated with plasma lipids and coronary artery disease (CAD).
The 8q24 locus, containing the Tribbles-1 (TRIB1) gene, is uniquely associated with all four major plasma lipid traits and CAD.
While initial genetic findings are compelling, the precise role and mechanisms of TRIB1 in cardiometabolic phenotypes require further elucidation.

Purpose of the Study:

To review current knowledge regarding the TRIB1 gene's association with cardiometabolic phenotypes.
To explore the challenges and future directions in understanding TRIB1's function and the impact of noncoding genetic variation.
To investigate the potential roles of hepatic and extrahepatic TRIB1 in lipid metabolism.

Main Methods:

Review of existing literature on GWAS findings related to TRIB1.
Analysis of in vivo loss and gain of function studies on Trib1.
Discussion of molecular mechanisms, including TRIB1's interaction with C/EBPα.

Main Results:

TRIB1 is a novel GWAS locus associated with multiple lipid traits and CAD.
In vivo studies confirm Trib1's role in hepatic lipid metabolism.
Key questions remain regarding TRIB1's causality, the functional impact of noncoding variants, and its interaction with C/EBPα.

Conclusions:

The TRIB1 gene at the 8q24 locus represents a significant genetic link to cardiometabolic disease.
Translational research is crucial to unravel the complex functions of TRIB1 and its therapeutic potential.
Further investigation is needed to determine if TRIB1 is the causal gene and to understand the full spectrum of its regulatory roles in lipid metabolism.