What does woodward–hoffmann rules mean?
Definitions for woodward–hoffmann rules
wood·ward–hoff·mann rules
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Woodward–Hoffmann rules
The Woodward–Hoffmann rules, devised by Robert Burns Woodward and Roald Hoffmann, are a set of rules in organic chemistry predicting the barrier heights of pericyclic reactions based upon conservation of orbital symmetry. The Woodward–Hoffmann rules can be applied to understand electrocyclic reactions, cycloadditions, sigmatropic reactions, and group transfer reactions. Reactions are classified as allowed if the electronic barrier is low, and forbidden if the barrier is high. Forbidden reactions can still take place but require significantly more energy. The Woodward–Hoffmann rules were first formulated to explain the striking stereospecificity of electrocyclic reactions under thermal and photochemical control. Thermolysis of the substituted cyclobutene trans-1,2,3,4-tetramethylcyclobutene gave only one diastereomer, the-3,4-dimethyl-2,4-hexadiene as shown below; the and the diastereomers were not detected in the reaction. Similarly, thermolysis of cis-1,2,3,4-tetramethylcyclobutene gave only the diastereomer. Due to their elegance and simplicity, the Woodward–Hoffmann rules are credited with first exemplifying the power of molecular orbital theory to experimental chemists. Hoffmann was awarded the 1981 Nobel Prize in Chemistry for this work, shared with Kenichi Fukui who developed a similar model using frontier molecular orbital theory; because Woodward had died two years before, he was not eligible to win what would have been his second Nobel Prize for Chemistry.
Numerology
Chaldean Numerology
The numerical value of woodward–hoffmann rules in Chaldean Numerology is: 9
Pythagorean Numerology
The numerical value of woodward–hoffmann rules in Pythagorean Numerology is: 3
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"woodward–hoffmann rules." Definitions.net. STANDS4 LLC, 2024. Web. 26 Apr. 2024. <https://www.definitions.net/definition/woodward%E2%80%93hoffmann+rules>.
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