Theoretical study on the halogen-zinc exchange reaction by using organozincate compounds

Shinji Nakamura, Ching Yuan Liu, Atsuya Muranaka, Masanobu Uchiyama

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16 Scopus citations

Abstract

Density functional theory (DFT) calculations have been performed to examine the mechanism of the halogen-zinc exchange reaction of organozincate reagents (Me2RZnLi·OMe2; R = Me, Et, iPr, and tBu) with organohalides (RX; R = Me, vinyl, ethynyl, -CH(Cl)CH3, -CH-(CHE 3)CHCH2; X = Cl, Br, I). We focused on three areas: 1) the effect of the halogen species, 2) the effect of the alkyl ligand on zinc, 3) the effect of the substrate nature. Fragment-energy analysis of each reaction was conduct- ed to elucidate the factors determining the activation energy. The nature of the halogen atom affects the interaction (INT) energy but does not affect the deformation (DEF) energy. On the other hand, the type of alkyl ligand influences DEF rather than INT and bulky ligands (including tert-butyl and iso-propyl groups) decrease the activation energy compared with smaller ligHENTands, such as ethyl and methyl groups. In the reaction with vinyl iodide, a decrease in DEF promoted the reaction, whereas INT was almost unchanged. However, in the case of io-doacetylene, a decrease in INT lowered the activation energy. For allyl iodide derivatives DEF appears to be the determining factor, whereas for gem-di-haloalkane derivatives INT is the main determinant of reactivity.

Original languageEnglish
Pages (from-to)5686-5694
Number of pages9
JournalChemistry - A European Journal
Volume15
Issue number23
DOIs
StatePublished - 2 Jun 2009

Keywords

  • Density functional calculations
  • Fragment-energy analysis
  • Halides
  • Halogen-zinc exchange
  • Zincates

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