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Polymerization of isoprene can generate different chain geometries. The configuration and connectivity of the repeating units influence the properties of the resulting polymer, so monomer identity alone does not completely specify a rubber-like material.
The compound . Regioselected ring expansion of 2-methylcyclopentanone followed by lactam hydrolysis is a constitutional synthetic disconnection.
A cyclic compound contains at least one closed sequence of bonded atoms. Rings can contain only carbon or include heteroatoms, and can be saturated, unsaturated, aromatic, fused, bridged, or spiro-connected.
For example, cyclohexane is a saturated carbocycle and pyridine is an aromatic heterocycle. Ring size and connectivity constrain conformation and strain, so cyclicity provides structural information beyond a molecular formula.
A phosphonate ester contains a phosphorus-carbon bond and esterified phosphorus-oxygen groups, commonly represented as . The carbon bonded directly to phosphorus distinguishes this framework from an ordinary phosphate ester.
Changing the organic groups changes solubility and reactivity while retaining the phosphorus-containing functional group. Phosphonate esters are consequently useful intermediates for forming carbon-carbon bonds in organic synthesis.
A salt containing a tetracoordinate positively charged phosphorus centre. Deprotonation of a suitable carbon substituent gives a phosphorus ylide.
A heteronuclear diatomic molecule consisting of carbon and sulfur. Its permanent electric dipole moment permits an electric-dipole rotational spectrum. The linear rigid rotor model relates its rotational constant to its reduced mass and bond length.
A hydrogen-containing zirconium phase that can precipitate from hydrogen-bearing zirconium alloys. Brittle hydride platelets and their orientation affect cracking resistance; their behavior differs from dissolved hydrogen.
The molecule is emitted by volcanism and combustion and can be oxidized into sulfuric acid/sulfate. Direct gas deposition competes with gas-phase and aqueous oxidation. The precursor-gas lifetime and the resulting particle lifetime are different quantities.
An oxide with a perovskite structure. Near room temperature its tetragonal phase has switchable electric polarization and is ferroelectric. Its higher-temperature cubic phase is paraelectric.
An ionic compound with the fluorite structure at ordinary conditions.
An ionic compound with the fluorite structure at ordinary conditions.
The intermetallic compound , commonly with the L12 structure. In superalloys substitution changes its precise composition.
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