Thermal isomerization of hexakis(t-butyldimethylsilyl)tetrasilabicylo[1.1.0]butane (2) to the corresponding tetrasilacyclobutene (1) as well as photochemical isomerization of 1 to 2 was confirmed using substituent-labeling experiments to proceed via 1,2-silyl-migration instead of skeletal isomerization.
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Iwamoto et al. (1998) studied this question.
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