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... World of Chemistry Zumdahl Last revision Fall 2008 ...
Learning Guide: Water and Biomolecules (cont.) Bill Activity #17 To
Learning Guide: Water and Biomolecules (cont.) Bill Activity #17 To

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ORDANOCHROMIUM CHEMISTRY SUPPORTED BY -DIIMINE LIGANDS
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... In the next few slides we will be looking at how to write formulas and names for three different types of chemical compounds: • 1. IONIC COMPOUNDS • 2. MOLECULAR COMPOUNDS • 3. ACIDS *Each type will have a set of rules that we must follow to correctly represent the substance. ...
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... Use the helium-4 isotope to define atomic number and mass number. Why does a knowledge of atomic number enable us to deduce the number of electrons present in an atom? Helium–4, written 42 He , has atomic number 2 because it has 2 protons (number at lower left) and mass number 4 because it has a tot ...
< 1 ... 161 162 163 164 165 166 167 168 169 171 >

Homoaromaticity



Homoaromaticity in organic chemistry refers to a special case of aromaticity in which conjugation is interrupted by a single sp3 hybridized carbon atom. Although this sp3 center disrupts the continuous overlap of p-orbitals, traditionally thought to be a requirement for aromaticity, considerable thermodynamic stability and many of the spectroscopic, magnetic, and chemical properties associated with aromatic compounds are still observed for such compounds. This formal discontinuity is apparently bridged by p-orbital overlap, maintaining a contiguous cycle of π electrons that is responsible for this preserved chemical stability.The concept of homoaromaticity was pioneered by Saul Winstein in 1959, prompted by his studies of the “tris-homocyclopropenyl” cation. Since the publication of Winstein's paper, much research has been devoted to understanding and classifying these molecules, which represent an additional “class” of aromatic molecules included under the continuously broadening definition of aromaticity. To date, homoaromatic compounds are known to exist as cationic and anionic species, and some studies support the existence of neutral homoaromatic molecules, though these are less common. The 'homotropylium' cation (C8H9+) is perhaps the best studied example of a homoaromatic compound.
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