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Henry Rzepa's Blog

Henry Rzepa's Blog
Chemistry with a twist
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Chemical ITAmerican National Science FoundationBond LengthChemDrawChemicalCiencias QuímicasInglés
Publicado

Members of the chemical FAIR data community have just met in Orlando (with help from the NSF, the American National Science Foundation) to discuss how such data is progressing in chemistry. There are a lot of themes converging at the moment.

Curly ArrowsInteresting Chemistry/RTActivation EnergyActivation Free EnergyCiencias QuímicasInglés
Publicado

Students learning organic chemistry are often asked in examinations and tutorials to devise the mechanisms (as represented by curly arrows) for the core corpus of important reactions, with the purpose of learning skills that allow them to go on to improvise mechanisms for new reactions.

Interesting ChemistryBiblical ManuscriptsBook DesignBook Of KellsBooksCiencias QuímicasInglés
Publicado

The Book of Kells is a spectacularly illuminated gospel manuscript dating from around 800AD and held in Trinity College library in Dublin. Some idea of the colours achieved can be seen below.

Interesting ChemistryAntiaromaticityAromaticityBaird's RuleConjugated SystemCiencias QuímicasInglés
Publicado

There is emerging interest in cyclic conjugated molecules that happen to have triplet spin states and which might be expected to follow a 4n rule for aromaticity. The simplest such system would be the triplet state of cyclobutadiene, for which a non or anti-aromatic singlet state is always found to be lower in energy.

Chemical ITAcademic PublishingAcrobatArticlesChemical DiscoveriesCiencias QuímicasInglés
Publicado

The traditional structure of the research article has been honed and perfected for over 350 years by its custodians, the publishers of scientific journals. Nowadays, for some journals at least, it might be viewed as much as a profit centre as the perfected mechanism for scientific communication.

Interesting ChemistryChemical KineticsChemical ReactionChemistryDeuteriumCiencias QuímicasInglés
Publicado

Five years back, I speculated about the mechanism of the epoxidation of ethene by a peracid, concluding that kinetic isotope effects provided interesting evidence that this mechanism is highly asynchronous and involves a so-called “hidden intermediate”. Here I revisit this reaction in which a small change is applied to the atoms involved.

Chemical ITAcademiaAcademic PublishingAmerican Chemical SocietyAngewandte ChemieCiencias QuímicasInglés
Publicado

For perhaps ten years now, the future of scientific publishing has been hotly debated. The traditional models are often thought to be badly broken, although convergence to a consensus of what a better model should be is not apparently close.

HistoricalAlan DronsfieldAlizarinAnthraquinone DyesArt MaterialsCiencias QuímicasInglés
Publicado

The Royal Society of Chemistry historical group (of which I am a member) organises two or three one day meetings a year. Yesterday the October meeting covered (amongst other themes) the fascinating history of madder and its approximately synthetic equivalent alizarin.