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Related Concept Videos

SN1 Reaction: Stereochemistry02:15

SN1 Reaction: Stereochemistry

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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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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...
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SN1 Reaction: Mechanism02:25

SN1 Reaction: Mechanism

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

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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.
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We typically love the people with whom we form relationships, but the type of love we have for our family, friends, and lovers differs. Robert Sternberg (1986) proposed that there are three components of love: intimacy, passion, and commitment. These three components form a triangle that defines multiple types of love: this is known as Sternberg’s triangular theory of love. Intimacy is the sharing of details and intimate thoughts and emotions. Passion is the physical attraction—the...
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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,...
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Triangular Regulation of Cucurbit[8]uril 1:1 Complexes.

Sébastien Combes1,2, Khoa Truong Tran1, Mehmet Menaf Ayhan1,3

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Scientists formed supramolecular triangles using cucurbiturils (CB[8]) and sodium ions. This breakthrough allows for precise triangulation of guests and network formation, advancing supramolecular chemistry.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Crystal Engineering

Background:

  • Triangular shapes are prevalent in nature and inspire scientific structures.
  • Supramolecular chemistry facilitates the creation of functional triangular assemblies.
  • Previous studies reported paramagnetic cucurbit[8]uril (CB[8]) triangles, but formation mechanisms were unclear.

Purpose of the Study:

  • To elucidate the formation parameters of supramolecular triangles using cucurbituril.
  • To extend the concept of triangular assembly to biradicals and diamagnetic guests.
  • To explore network formation through the reticulation of CB[8] triangles.

Main Methods:

  • Electrospray Ionization Mass Spectrometry (ESI-MS) to observe sodium ion presence.
  • X-ray crystallography and molecular modeling to determine cation binding sites.
  • Diffusion Ordered Spectroscopy Nuclear Magnetic Resonance (DOSY-NMR) and Dynamic Light Scattering (DLS) for structural analysis.
  • Exploration of paramagnetic and diamagnetic guests, including biradicals and ketone-containing molecules.

Main Results:

  • The radical nature of guests and the presence of sodium ions (Na+) are crucial for CB[8] triangle formation.
  • Two sodium ions were consistently observed in trimer structures, stabilizing the triangular assemblies.
  • Diamagnetic guests with H-bond acceptor functions, like ketones, also form stable CB[8] triangles with sodium ions.
  • A binding constant for the triangulation process was proposed.
  • The concept was extended to form extended networks using dinitroxide biradicals.

Conclusions:

  • Sodium ions play a key role in triggering and stabilizing cucurbituril-based supramolecular triangles.
  • This work provides a comprehensive understanding of CB[8] triangle formation, applicable to both paramagnetic and diamagnetic systems.
  • The findings enable the design of novel supramolecular architectures and extended networks for advanced applications.