X-Ray structural evidence for dipolar character in the arsonium ylide triphenylarsonium 2-acetyl-3,4,5-triphenylcyclopentadienylide

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Abstract
Molecular dimensions found in a crystal structure analysis of triphenylarsonium 2-Acetyl-3,4,5-triphenylcyclopentadienylide establish that a dipolar form with an As+ O– intramolecular interaction makes a significant contribution to the ground-state structure.