Sigmatropic [1,3]-boron shift (permanent allylic rearrangement) in 3-allyl-3-borabicyclo[3.3.1]nonanesстатья
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Дата последнего поиска статьи во внешних источниках: 2 декабря 2016 г.
Аннотация:2D H-1-H-1 EXSY NMR spectroscopy show that the free energy of activation AG in six 3-ally1-3-borabicyclo [3.3.11nonane derivatives is significantly higher (72-86 kJ mol(-1)) than that in typical allylboranes (48-66 kJ mol(-1)). For the first member of the series, viz., 3-ally1-3borabicyclo [3.3.11nonane, the activation parameters of the permanent allylic rearrangement were also determined (Delta H-not equal = 82.7+3.4 kJ mol(-1), Delta S-not equal = 11.8 +/- 10.3 J mol(-1) K-1, E-A 85.5 +/- 3.4 kJ mol(-1), ln(A) = 29.2 +/- 1.2).