Journal
HETEROATOM CHEMISTRY
Volume 18, Issue 7, Pages 754-758Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/hc.20364
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Calculations on phosphole systems using the G3MP2B3 model chemistry show that the phosphorus lone pair is critical to the system's aromaticity. Protonation of the lone pair results in antiaromatic molecules as measured by homomolecular homodesmotic reactions. Attempts to separate out effects of hyperconjugation on the butadiene portion of the system are unsuccessful with current practices. Because these hyperconjugation effects will tend to cancel each other in the phosphole systems, analyses using the unmodified homomolecular homodesmotic reactions are considered reasonable measures of their aromaticity. (c) 2007 Wiley Periodicals, Inc.
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