The mesityl-substituted cyclotrigermene 1 underwent [2+4] cycloaddition with isoprene and 2,3-dimethyl-1,3-butadiene to yield 1,6,7-trigerma-7-mesitylbicyclo[4.1.0]hept-3-ene derivatives 2, and [2+2] cycloaddition with phenylacetylene to yield 1,4,5-trigerma-5-mesityl-2-phenylbicyclo[2.1.0]pent-2-ene (3).
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Fukaya et al. (2000) studied this question.
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