The fluxional behavior of the E (4a) and Z (4b) isomers of 2,4-pentadienyldipropylborane has been studied by dynamic 1H and 13C NMR spectroscopy. Activation barriers have been determined for degenerate metallotropic rearrangements of 4a and 4b and for 4a ⇄ 4b interconversion by complete line shape analysis of 13C DNMR spectra. The data obtained suggest that only 1,3 shifts of BPr2 groups take place in both isomers rather than 1,5 sigmatropic shifts.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry