Eclipsed conformers of oligosilane derivatives by intramolecular hypercoordination

The eclipsed conformers of ClSiH2SiH2SiH2OH (1) and dl-ClSiH2(OH)SiHSiH(OH)SiH2Cl (2) are the most stable due to the attractive 1,4-hypercoordination by the nO and σ*SiCl orbital interaction. The eclipsed rotamer of ClSiH2(OH)2SiSi(OH)(SiH2Cl)2 (3) is the exclusive conformer stabilized by the threefold 1,4-hypercoordination.