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Finally, using a g-substituted allenoate, the desired product is
obtained with a lower yield (30%, Table 1, entry 12). The
isomerization of the allene into the corresponding diene was
the main reaction.
     The method provides functional 1-allylazoles with a
predominant E-stereoselectivity, the E/Z ratio ranging
from 64/36 to 100/0. The stereoselectivity can be easily
explained by assuming that the elimination step follows an
E1cB mechanism where unfavorable steric hindrance
between the azole and the electron withdrawing group
induces the preferential formation of the E-isomer.

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