All Things Metathesis

  • About

1st Generation Grubbs Catalyst

September 29, 2009 By Andy Nickel

1st Generation Grubbs Catalyst1 (Ph = phenyl; PCy3 = tricyclohexylphosphine) - CAS#: [172222-30-9] - FW: 822.95 - Color: Purple - Initiation temperature: >20 °C Process Strengths Weaknesses CM2 -Synthesis of 1,2-disubstituted … [Continue reading]

Shell Higher Olefins Process

September 28, 2009 By Andy Nickel

At over a million tons of capacity, the Shell Higher Olefins Process (SHOP) is one of the standards of industrial olefin metathesis chemistry. SHOP is remarkable in both its chemistry and process engineering. The process was developed for the … [Continue reading]

Cross Metathesis

September 24, 2009 By Diana Stoianova

Cross metathesis (CM) is an attractive alternative to other olefination methods due to the large variety of commercially available olefin starting materials and to the high functional group tolerance of the ruthenium metathesis catalysts. Depending … [Continue reading]

Acyclic Diene Metathesis

September 23, 2009 By Paul Boothe

Acyclic Diene Metathesis (ADMET) uses metathesis of terminal dienes to produce linear polymers and ethylene. Because ADMET is actually a variation on cross-metathesis, the process is reversible, and ethylene must be removed to drive the … [Continue reading]

Enyne Metathesis

September 22, 2009 By Andy Nickel

Enyne metathesis is the reaction of an olefin and an alkyne to produce a 1,3-diene. When an alkyne is available to coordinate a ruthenium alkylidene, the reaction known as enyne metathesis can occur. The mechanism is analogous to an RCM … [Continue reading]

Asymmetric Metathesis

September 21, 2009 By Diana Stoianova

The first asymmetric Mo-based metathesis catalyst was reported by Grubbs way back in 1996 (J. Am. Chem. Soc. 1996, 118, 2499).  Since then, a large number of other chiral catalysts have been developed, based both on Ru and Mo (some structures shown … [Continue reading]

Ring-opening Metathesis Polymerization

September 17, 2009 By Paul Boothe

Ring-opening metathesis polymerization (ROMP) uses metathesis catalysts to generate polymers from cyclic olefins. ROMP is most effective on strained cyclic olefins, because the relief of ring strain is a major driving force for the reaction – … [Continue reading]

Ring Closing Metathesis

September 16, 2009 By Andy Nickel

If all goes well, I plan to write about Ring Closing Metathesis (RCM) quite a bit on this site, so I figured I needed a very broad RCM overview. Anyway, what kind of metathesis website would this be without the generic RCM scheme we’ve all seen a … [Continue reading]

Ruthenium Catalysts – 2nd Generation

September 15, 2009 By Jean-Baptiste Bourg

The second revolution in ruthenium-catalyzed olefin metathesis was triggered by substituting one phosphine ligand in 1st generation catalysts with a more basic N-heterocyclic carbene (NHC). The activity of these 2nd generation (NHC-bearing) catalysts … [Continue reading]

Ruthenium Catalysts – 1st Generation

September 14, 2009 By Jean-Baptiste Bourg

Modern ruthenium based olefin catalysts encompass a range of complexes able to readily generate a 14 electron catalytic active species of the generic formula (L)(X2)Ru=CRR’ (L being a phosphine ligand in first generation catalysts). The first … [Continue reading]

Olefin Metathesis – The Benefits

September 11, 2009 By Andy Nickel

What’s the Big Deal? Why do we need a whole website dedicated to olefin metathesis? Because there’s enough information out there to warrant one. And it’s a useful process. Ask any organic chemist and they’ll tell you that most of their time and … [Continue reading]

  • « Previous Page
  • 1
  • …
  • 24
  • 25
  • 26
  • 27
  • Next Page »

SO WHAT IS ALL THINGS…

All Things Metathesis is intended to serve as a resource on olefin metathesis and provide a setting for metathesis users to discuss this evolving technology.

Subscribe to All Things Metathesis by Email

Subscribe by RSS

  • RSS

Categories

  • ASAPs
  • Best Practices
  • Metathesis In Action
  • News
  • Processes
  • Ruthenium Catalysts
  • Suggested Resources
  • The Basics

Looking for Something?

Recent Posts

  • ASAP’s – 2021 – Week 08-14
  • ASAP’s – 2021 – Week 02-07
  • ASAP’s – 2020 – Week 50 through 2021 – Week 1
  • ASAP’s – 2020 – Week 47-49
  • ASAP’s – 2020 – Week 40-46

Archives

Copyright © Umicore