Multidimensional NMR Study of Tris(indenyl)methylsilane: Molecular Dynamics Mapped onto a Hypercube

(Trimethylsilyl)indene exists as a pair of enantiomers which interconvert by means of Me3Si migrations. The mechanism involves successive [1,5]-suprafacial sigmatropic shifts via the corresponding isoindene, which can be trapped with tetracyanoethylene as the Diels−Alder adduct, 7. The X-ray crystal structure of 7 reveals that the TCNE approaches from the opposite face to the Me3Si substituent. Tris(indenyl)methylsilane, 5, also undergoes a …