The strain energy in the bowl-shaped benzene ring incorporated in superphane has been estimated by the MO theoretical calculations at 20.6 kcal/mole (the 4–31 G calculations). The π-orbitals on the ring are not parallel to each other, but loss in the π-resonance energy does not appear...
Consider the discovery of the "Benzene Ring" by Kekulé: He had a dream of a snake biting its tail which lead him to consider the form of a ring. Sud- den insight after some time of incubation? Yes. Was knowledge unnecessary? No. He had a vast knowl- edge about chemistry, he ...
Would you expect C to be more or less stable than A and B? We can write two resonance structures for toluene, C6H5CH3: How would you expect the carbon-carbon bond lengths in the six-membered ring of toluene to compare with the carbon-carbon bond...
(b) When a material is subjected to a cyclic stress, large cracks grow more slowly How the deformation is affected when the working fluid is different? Draw the three Mohr's circles that describe the state of stress shown in figure. Explain brie...
Explain how symmetry arguments are used to construct molecular orbitals. Why the six atoms that are involved in the peptide bond share a common geometric plane? Benzene contains a six-membered ring of carbon atoms, but it is flat rather than puckered. Explain ...
372 ANSWERS 2 ▶ Draw a demand curve using the information in Table 3.3. 1600 1400 1200 1000 800 600 400 200 0 0 123 Price (US$) 4 3 ▶ Al currently charges US$3 for his giant burgers. How many burgers would he expect to sell at this price? At US$3 ...
For now, that does it for a summary of the important themes in resonance. Next stop (after a post about some common mistakes) will be to apply these principles to chemical reactivity. Next Post:Common Mistakes – How NOT to Draw Resonance Curved Arrows ...
Among the pyrolysis products, the incombustible ones (e.g., water and CO2) play a key role in reducing the material flammability, contrary to the combustible ones (e.g., alcohol, aldehyde, ketone, furan, benzene ring, ester, and ether), whose amount is significantly different when they ...
Fungi comprise a monophyletic yet unresolved kingdom. At the moment, it is still not possible to diagnose fungi based on specific characters and they should be regarded as a group without synapomorphies [1]. Nevertheless, it is clear that the evolution of both osmotrophic and rigid cells, wh...
rdMetricMatrixCalc import GetTanimotoSimMat, GetTanimotoDistMat # from rdkit.Chem.Draw import IPythonConsole # import curated datasets efflux_evaders_om_corrected = pd.read_pickle('data_curated/efflux_evaders_om_corrected.pkl') efflux_substrates_om_corrected = pd.read_pickle('data_curated/efflux...