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Crystal structures of two polycyclic compounds containing 7-metalonorbornene (silicon and germanium) units

In our research in organometallic cycloaddition chemistry, we have studied Diels-Alder reactions of 1-sila-2, 5-diphenyl-1, 1-dimethyl-2, 4-cyclopentadiene, 1-sila-2, 3, 4, 5-tetraphenyl-1, 1-dimethyl-2, 4-cyclopen tadiene and 1-germa-2, 3, 4, 5-tetraphenyl-1, 1-dimethyl-2, 4-cyclopentadiene as reactive dienes under high pressure. These dienes react readily with 7-oxanorbornene and 7-oxabenzonorbornadiene double bond and form polycyclic compounds containing 7-metalonorbornene (silicon or germanium) moieties. Stereochemistry of the additions was established by crystallographic study of adducts 1 and 2 to be exo, endo-. Diffracted intensities were collected on the Oxford Diffraction Xcalibur 3 diffractometer using graphite-monochromated MoKα radiation at 100 K. Data reduction was performed using the CrysAlis software package. The structures were solved by direct methods (SHELXS) and refined by the full-matrix least-squares method based on F2 against all reflections (SHELXL). All non-hydrogen atoms were refined anisotropically. Hydrogen atoms were placed geometrically.

polycyclic compound; 7-metalonorbornene (silicon and germanium) units

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