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Henry Rzepa's Blog

Henry Rzepa's Blog
Chemistry with a twist
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Chemical IT3D GraphicsAppleGPUHTML5Chemical Sciences
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If you get a small rotatable molecule below, then ChemDoodle/HTML5/WebGL is working. Why might this be important? Well, the future is mobile, in other words, devices that rely on batteries or other sources of built-in power. This means the power guzzling GPU cards of the past (some reach ~400 Watts!) cannot be used.

General/RTAnomeric EffectsArrow PushingConfigurational IsomerChemical Sciences
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Chemistry gets complex very rapidly. Consider the formula CH3NO as the topic for a tutorial in introductory chemistry. I challenge my group (of about 8 students) to draw as many different molecules as they can using exactly those atoms. I imply that perhaps each of them might find a different structure;

HypervalencyInteresting ChemistryHenry RzepaJahn-TellerPenceChemical Sciences
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Do you fancy a story going from simplicity to complexity, if not absurdity, in three easy steps? Read on! The following problem appears in one of our (past) examination questions in introductory organic chemistry. From relatively mundane beginnings, one can rapidly find oneself in very unexpected territory.

Interesting ChemistryActivation Free EnergyBenzonitrile ProductChemical MythologyColoured SolutionsChemical Sciences
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Janus was the mythological Roman god depicted as having two heads facing opposite directions, looking simultaneously into the past and the future. Some of the most ancient (i.e. 19th century) known reactions can be considered part of a chemical mythology; perhaps it is time for a Janus-like look into their future.

Interesting ChemistryEnergyFree EnergyHuckelPretty Straight ForwardChemical Sciences
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More inspiration from tutorials. In a lecture on organic aromaticity, the 4n+2/4n Hückel rule was introduced (in fact, neither rule appears to have actually been coined in this form by Hückel himself!). The simplest examples are respectively the cyclopropenyl cation and anion.