Synthesis and properties of novel silyl-substituted cyclobutadienes and tetrahedranes.
Cyclobutadienes as well as the corresponding tetrahedranes were prepd. according to the Masamune route by starting from diazo compds. Low-temp. 13C-NMR measurements of the cyclobutadienes lead to the 1st exact values of the barrier heights in the interconversion of the two rectangular forms of the cyclobutadienes.
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