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Related Concept Videos

SN1 Reaction: Stereochemistry02:15

SN1 Reaction: Stereochemistry

10.3K
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...
10.3K
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

14.2K
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...
14.2K
Acidity of 1-Alkynes02:42

Acidity of 1-Alkynes

11.1K

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.
11.1K
Predicting Products: SN1 vs. SN202:27

Predicting Products: SN1 vs. SN2

17.3K
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,...
17.3K
Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

4.6K
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...
4.6K

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Related Experiment Video

Updated: Jan 28, 2026

Milk Collection in the Rat Using Capillary Tubes and Estimation of Milk Fat Content by Creamatocrit
07:38

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Milk Intolerance 1.

W E Sandine1, Michele Daly1

  • 1Department of Microbiology, Oregon State University, Corvallis, Oregon 97331.

Journal of Food Protection
|March 1, 2019
PubMed
Summary
This summary is machine-generated.

Milk intolerance has multiple causes beyond lactose intolerance, including toxic and immunological reactions to milk components. Physicians need broader knowledge to accurately diagnose and advise patients on milk restriction.

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Area of Science:

  • Gastroenterology
  • Immunology
  • Pediatrics

Background:

  • Milk intolerance encompasses more than just lactose intolerance.
  • Other causes include toxic effects from milk components and immunological hypersensitivity to milk proteins.

Purpose of the Study:

  • To review recent publications on milk intolerance.
  • To emphasize the need for increased physician knowledge, particularly among pediatricians.
  • To discuss diagnostic methods for lactose intolerance and their limitations.

Main Methods:

  • Literature review of recent publications on milk intolerance.
  • Discussion of diagnostic methods for lactose intolerance.
  • Analysis of limitations in current diagnostic approaches.

Main Results:

  • Lactose intolerance is not the sole cause of milk intolerance.
  • Diagnostic methods for lactose intolerance have limitations.
  • Over-diagnosis may lead to unnecessary milk restriction.

Conclusions:

  • Physicians require enhanced understanding of diverse milk intolerance mechanisms.
  • Accurate diagnosis is crucial to avoid inappropriate dietary recommendations.
  • Further research may refine diagnostic strategies for milk-related disorders.