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Trimethylphosphine is , an electron-releasing phosphine ligand. Comparison of its carbonyl complexes with other phosphines helps separate steric and electronic trends.
Di-tert-butylphenylphosphine is the bulky mixed alkyl/aryl phosphine . Its tert-butyl substituents strongly influence steric interactions at a metal.
Acetonitrile, , can coordinate through nitrogen as a neutral two-electron donor. Bound acetonitrile can be displaced by a stronger donor or an intramolecular chelating group.
An enol has an OH group bonded to a carbon of a C=C bond. Protonation and pi-bond rearrangement can interconvert it with a carbonyl compound through keto-enol tautomerism.
Dihydrotestosterone is the 5α-reduced steroid formed from testosterone. Reduction saturates the C4=C5 bond while retaining the C3 ketone and the other steroid functional groups.
Testosterone is a steroid with a conjugated C3-ketone/C4=C5 fragment. 5α-reductase adds hydride at C5 and a proton at C4 to make dihydrotestosterone.
Finasteride is an unsaturated 4-azasteroid inhibitor of steroid 5α-reductase. Enzyme-generated reduction and enolate capture of oxidized cofactor give a covalent cofactor–inhibitor adduct; the protein itself need not be covalently modified.
An enone has a carbonyl conjugated to a carbon–carbon double bond, . Its beta carbon can undergo conjugate addition.
A phosphazene contains phosphorus–nitrogen bonding often represented with formal P=N units. Ionic bonding and negative hyperconjugation provide a modern account; formal double-bond drawings do not require phosphorus pi bonding.
The ideal carbon cage has Ih molecular point group symmetry. The highest symmetry-protected orbital degeneracy is five; spin degeneracy is counted separately.
The isolated molecular form is an ideal trigonal bipyramid with D3h molecular point group symmetry. Its solid-state structures need not consist of the same isolated molecules.
An organic compound belongs to the conventional chemistry of carbon-based molecular frameworks, including hydrocarbons and their functionalized derivatives. The definition is practical and historical rather than a claim that every carbon-containing substance is organic.
Carbon dioxide and simple carbonates are usually treated as inorganic. Conversely, an organic compound need not have been produced by a living organism: a laboratory synthesis can give the same molecular identity as a natural source.
Phosphorus tribromide is , a molecular compound with three phosphorus-bromine bonds and a lone pair on phosphorus. It reacts with alcohol functional groups in transformations that can replace hydroxyl by bromine.
For an appropriate primary or secondary alcohol, substitution can proceed through attack by bromide on an activated carbon-oxygen bond. This connects reagent choice with both the mechanism and the stereochemistry of the product.
Pinned article: Introduction to the OurBigBook Project
Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
Intro to OurBigBook
. Source. We have two killer features:
- topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculusArticles of different users are sorted by upvote within each article page. This feature is a bit like:
- a Wikipedia where each user can have their own version of each article
- a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
Figure 1. Screenshot of the "Derivative" topic page. View it live at: ourbigbook.com/go/topic/derivativeVideo 2. OurBigBook Web topics demo. Source. - local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
- to OurBigBook.com to get awesome multi-user features like topics and likes
- as HTML files to a static website, which you can host yourself for free on many external providers like GitHub Pages, and remain in full control
Figure 2. You can publish local OurBigBook lightweight markup files to either OurBigBook.com or as a static website.
Figure 3. Visual Studio Code extension installation.
Figure 5. . You can also edit articles on the Web editor without installing anything locally. Video 3. Edit locally and publish demo. Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension. 
- Infinitely deep tables of contents:
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact