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Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

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To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Covalent Bonding and Lewis Structures

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Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
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The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

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Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
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Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy
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Dihydrogen Splitting Using Dialkylsilylene-Based Frustrated Lewis Pairs.

Zhaowen Dong1,2, Zhifang Li1, Xupeng Liu1

  • 1Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, No. 2318 Yuhangtang Rd. Hangzhou, 311121, Zhejiang, China.

Chemistry, an Asian Journal
|February 15, 2017
PubMed
Summary

Dialkylsilylene 5 reacts with dihydrogen using Lewis acids or bases, forming dihydrosilane 10. This demonstrates the frustrated Lewis pair (FLP) activity of silylene 5, highlighting its amphoteric nature.

Keywords:
Lewis acid and basedialkylsilylenedihydrogen splittingdihydrosilanesfrustrated Lewis pairs

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Area of Science:

  • Organosilicon Chemistry
  • Catalysis

Background:

  • Silylenes are reactive silicon species.
  • Frustrated Lewis pairs (FLPs) are Lewis acids and bases that do not react with each other, enabling unique reactivity.
  • Dihydrogen activation is a key transformation in chemistry.

Purpose of the Study:

  • To investigate the reactivity of isolable dialkylsilylene 5 with dihydrogen.
  • To explore the potential of silylene 5 as a component in frustrated Lewis pairs (FLPs).
  • To demonstrate the amphoteric nature of silylene 5.

Main Methods:

  • Reaction of dialkylsilylene 5 with dihydrogen.
  • Use of Lewis acids (BPh3, BEt3) and Lewis bases (PPh3, PEt3, NPh3, NEt3) as co-catalysts.
  • Low-temperature conditions in hydrocarbon solvents.

Main Results:

  • High yields of dihydrosilane 10 were obtained.
  • Both silylene 5/Lewis acid and Lewis base/silylene 5 combinations effectively split dihydrogen.
  • The reactivity is consistent with the amphoteric character of silylene 5.

Conclusions:

  • Dialkylsilylene 5 can participate in frustrated Lewis pair chemistry.
  • Silylene 5 serves as an effective FLP component for dihydrogen activation.
  • The amphoteric nature of silylene 5 is crucial for its FLP activity.