# Tag Info

## Hot answers tagged organometallic-compounds

### Bonding between rings and iron atom in ferrocene

The "real" structure of ferrocene is an iron atom sandwiched between two flat, parallel, pentagonal C5H5 rings. The diagram above shows the atomic positions from a crystal structure but the ...
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### Negative oxidation states of Si

I am not sure if Silane ($\ce{SiH_4}$) can really be considered. But there are silicides which silicon forms with strongly electropositive metals. In these compounds, silicon has a negative ...
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### Are there any significant uses of the compound formed by magnesium and anthracene?

It seems like an idea of using magnesium anthracene systems for the $\ce{MgH2}$ production persisted since 1980s [1] till late 2000s, when new more efficient method with better scalability for ...
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### Organic reaction of dry ice and Grignard reagent

You are correct. Grignard reagents $\ce{RMgX}$ (where $\ce{R}$ stands for some hydrocarbon group and $\ce{X}$ is a halogen, usually $\ce{Cl}$, $\ce{Br}$, or $\ce{I}$) react with carbon dioxide to ...
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### Why can't the reaction of grignard reagent with carboxylic acid give a ketone?

Huy Ngo says it all. A Grignard reageant will react first with just about any hydrogen that has even a modicum of proton donation capability, before "resorting" to the slower nucleophilic ...
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### What makes R-MgX a more reactive Grignard reagent than R-Cu?

The difference in electronegativity between copper (1.9) and magnesium (1.3) is the key difference. Since copper is more electronegative than magnesium its electronegativity is much closer to that ...
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### Can ferrocene type sandwich compounds be made with fluorene?

Yes there are, many in fact. One of the examples is having a complex consisting of a fluorene molecule and of cp altogether with iron, described by Decken in Acta Cryst. E (doi: 10.1107/...
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### Do organopolonium compounds exist?

As one might expect for an element with no long-lived isotopes, little is known about organopolonium compounds. What is known may be broadly divided into two categories [1,2; cited by Wikipedia]: ...
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### Why do the protons in pentacarbonylmethylmanganese show up at –0.21 ppm?

Unfortunately, you don't give an indication of what you expect the chemical shift for the -Me to be, other than higher than is observed. However, you are correct in your assumption; the π back ...
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### Ketone/aldehyde synthesis from N-acylazetidines or aziridines

I think your suggestion about the stability of the tetrahedral intermediate is correct, but it's not that the tetrahedral intermediate itself has stability. I think it's because the collapse of the ...
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### Why are 3 equivalents of organolithium needed in synthesis of ketone from carboxylic acid?

The text box you are quoting from (p 219) refers to this specific reaction. The compound in question possesses an α-hydroxyl group, which needs to be deprotonated too. Notice that three equivalents ...
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### Effect of metal identity on CO bond length in carbonyl complexes

Let's look at the molecular orbital diagram calculated with JSmol. As you know, the principal effect is back-donation from the metal to the π-antibonding orbitals of the carbon monoxide. But not all ...
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