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Diradical-singlet character of 1,3-dipoles affects reactivity of 1,3-dipolar cycloaddition reactions and intramolecular cyclization

  • Rodolfo G. FiorotEmail author
  • Felipe de S. Vilhena
  • José W. de M. CarneiroEmail author
Original Paper
  • 12 Downloads
Part of the following topical collections:
  1. QUITEL 2018 (44th Congress of Theoretical Chemists of Latin Expression)

Abstract

1,3-Dipolar cycloaddition (1,3-DC) reactions are powerful synthetic tool to obtain highly functionalized 5-membered heterocycles, starting from a 1,3-dipole and a dipolarophile in a single step. The reactivity of these systems is usually rationalized in terms of Frontier Molecular Orbital Theory (FMOT), which neglects a possible contribution of an open-shell weakly coupled singlet-diradical specie. In this work, the broken-symmetry approach is used to estimate the singlet-diradical character of 18 dipoles of the second period of the periodic table, classified as allyl-type N-centered, allyl-type O-centered, and propargyl-type 1,3-dipoles, providing a rationalization for 1,3-DC reactivity. The intramolecular cyclization of bent allyl-type N- and O-centered dipoles into 3-membered rings was also analyzed, and revealed that the energetic change is associated with the spin densities of peripheral atoms. Finally, a close relationship between the energy for the ring-opening process of the cyclic configuration and the reactivity of 1,3-dipoles toward 1,3-dipolar cycloaddition reaction was also found.

Graphical abstract

Keywords

1,3-Dipolar cycloaddition 1,3-dipoles Singlet-diradical Broken symmetry Zwitterion 

Notes

Funding information

The authors acknowledge CNPQ and FAPERJ (grant E-26/203.001/2017) for providing research grants and financial support.

Supplementary material

894_2019_4162_MOESM1_ESM.docx (3.6 mb)
ESM 1 (DOCX 3715 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of ChemistryUniversidade Federal Fluminense (UFF)NiteróiBrazil
  2. 2.Instituto Federal de Educação, Ciências e Tecnologia do Rio de JaneiroRio de JaneiroBrazil

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