The synthesis and characterization of a macrobicyclic in,in-bis(hydrosilane) is described. A combination of crystallographic and computational data indicate that the central hydrogen-hydrogen nonbonded contact distance is the shortest for any crystallographically characterized compound.

The synthesis and characterization of the bis(triarylphosphine) 3 are described. Slow protonation of an inwardly directed phosphine is possible, but the phosphines do not react with larger reagents. X-ray structures of the parent compound, its HCl salt, and the corresponding trisulfone are reported. Compound 3 was resolved by chiral chromatography, but the barrier to racemization is only 20.7 kcal/mol.

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