Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Acidity of 1-Alkynes02:42

Acidity of 1-Alkynes

10.8K

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.
10.8K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.4K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
2.4K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.7K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.7K
Lewis Acids and Bases02:16

Lewis Acids and Bases

16.1K
This lesson delves into Lewis acids and bases in the context of the octet rule for electron-deficient compounds. Here, the concept is discussed, emphasizing the group 13 elements like boron or aluminium. Since group 13 elements possess three valence electrons, they form trivalent compounds with a sextet of electrons and a vacant orbital for the central atom. Consequently, these electron-deficient compounds accept electrons from other species to complete their octet in a chemical reaction. They...
16.1K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.1K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
2.1K
Preparation of Alkynes: Alkylation Reaction02:27

Preparation of Alkynes: Alkylation Reaction

11.7K
Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
11.7K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Electrical Imaging of DNA Substructures Using Quasi-Static Nanopore Scanning.

Nano letters·2026
Same author

Reactivity Studies on the Terminal Thorium Imido Metallocene (η<sup>5</sup>-C<sub>5</sub>Me<sub>5</sub>)<sub>2</sub>Th(═Ndipp)(dmap).

Inorganic chemistry·2026
Same author

The Relation Between Parenting Stress and Children's Social Anxiety in Chinese Family: The Roles of Maladaptive Parenting and FKBP5 Gene Variation.

Behavioral sciences (Basel, Switzerland)·2026
Same author

A PEGylated nanobody against HBsAg exhibits pleiotropic antiviral efficacy in hepatitis B models.

Journal of nanobiotechnology·2026
Same author

In vitro and in vivo antibacterial activity of oral tebipenem in combination with novel β-lactamase inhibitors (avibactam, relebactam, vaborbactam) against KPC-producing Enterobacterales.

European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology·2026
Same author

Diabetes-Related Balance Impairment in the Aging Population: A Combined NHANES and Mendelian Randomization Study.

Gerontology·2026

Related Experiment Video

Updated: Dec 7, 2025

Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
07:14

Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers

Published on: May 12, 2023

3.6K

A Lewis Base Supported Terminal Uranium Phosphinidene Metallocene.

Deqiang Wang1, Shichun Wang1, Guohua Hou1

  • 1Department of Chemistry, Beijing Normal University, Beijing 100875, China.

Inorganic Chemistry
|September 25, 2020
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a uranium phosphinidene complex and explored its reactivity. This uranium complex reacts with various small molecules, forming new uranium compounds like sulfidos, oxidos, and imido complexes.

More Related Videos

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
09:37

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

9.9K
Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
10:19

Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation

Published on: July 18, 2017

12.4K

Related Experiment Videos

Last Updated: Dec 7, 2025

Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
07:14

Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers

Published on: May 12, 2023

3.6K
Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
09:37

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

9.9K
Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
10:19

Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation

Published on: July 18, 2017

12.4K

Area of Science:

  • Organometallic Chemistry
  • Uranium Chemistry
  • Main Group Chemistry

Background:

  • Uranium complexes are of interest due to their unique electronic properties.
  • Terminal phosphinidene complexes are reactive intermediates.
  • Steric hindrance can influence the reactivity of organometallic compounds.

Purpose of the Study:

  • To synthesize and characterize a Lewis base-supported terminal uranium phosphinidene.
  • To investigate the reactivity of the uranium phosphinidene with small molecules.

Main Methods:

  • Synthesis of uranium phosphinidene complex 5 from uranium methyl chloride 4.
  • Reaction of complex 5 with various small molecules (isothiocyanates, aldehydes, imines, etc.).
  • Characterization of resulting uranium complexes.

Main Results:

  • Isolation and characterization of the uranium phosphinidene complex [η5-1,3-(Me3C)2C5H3]2U(═P-2,4,6-tBu3C6H2)(OPMe3) (5).
  • Observed limited reactivity with internal alkynes due to steric bulk.
  • Demonstrated broad reactivity with isothiocyanates, aldehydes, imines, diazenes, carbodiimides, nitriles, isonitriles, and organic azides.

Conclusions:

  • The synthesized uranium phosphinidene is a versatile building block.
  • The steric environment around the uranium center dictates reactivity.
  • New classes of uranium sulfidos, oxidos, metallaheterocycles, and imido complexes were accessed.