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- W2342851095 endingPage "7421" @default.
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- W2342851095 abstract "Abstract The adjacent lone pair (ALP) effect is an experimental phenomenon in certain nitrogenous heterocyclic systems exhibiting the preference of the products with lone pairs separated over other isomers with lone pairs adjacent. A theoretical elucidation of the ALP effect requires the decomposition of intramolecular energy terms and the isolation of lone pair–lone pair interactions. Here we used the block‐localized wavefunction (BLW) method within the ab initio valence bond (VB) theory to derive the strictly localized orbitals which are used to accommodate one‐atom centered lone pairs and two‐atom centered σ or π bonds. As such, interactions among electron pairs can be directly derived. Two‐electron integrals between adjacent lone pairs do not support the view that the lone pair–lone pair repulsion is responsible for the ALP effect. Instead, the disabling of π conjugation greatly diminishes the ALP effect, indicating that the reduction of π conjugation in deprotonated forms with two σ lone pairs adjacent is one of the major causes for the ALP effect. Further electrostatic potential analysis and intramolecular energy decomposition confirm that the other key factor is the favorable electrostatic attraction within the isomers with lone pairs separated." @default.
- W2342851095 created "2016-06-24" @default.
- W2342851095 creator A5000940583 @default.
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- W2342851095 creator A5011717029 @default.
- W2342851095 creator A5045890450 @default.
- W2342851095 creator A5083738795 @default.
- W2342851095 date "2016-05-03" @default.
- W2342851095 modified "2023-10-08" @default.
- W2342851095 title "Adjacent Lone Pair (ALP) Effect: A Computational Approach for Its Origin" @default.
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