π-Electron Donation at the Sulfoximidoyl Nitrogen Atom

Area of Science:

• Organic Chemistry
• Computational Chemistry

Background:

• Understanding functional group properties is crucial in organic chemistry.
• Sulfoximines are increasingly important but less studied functional groups.
• Theoretical data on sulfoximine properties are scarce.

Purpose of the Study:

• Investigate electronic interactions of the sulfoximidoyl group.
• Characterize the influence of these interactions on N-functionalized sulfoximines.
• Quantify the strength of nitrogen lone pair interactions with adjacent π-acceptor orbitals.

Main Methods:

• Density Functional Theory (DFT) based computational methods were employed.
• Analysis focused on quantifying interaction strengths.
• Characterized the impact on N-functionalized sulfoximine properties.

Main Results:

• A strong positive mesomeric effect was identified for the sulfoximidoyl group at nitrogen.
• This effect enhances the basicity of conjugated substituents.
• Nucleophilicity of conjugated substituents at the sulfoximidoyl nitrogen is also increased.

Conclusions:

• Sulfoximidoyl group exhibits significant electron-donating mesomeric effects.
• This challenges the common perception of sulfoximines as purely electron-withdrawing.
• Findings impact the understanding of sulfoximine reactivity and applications.