Addition Of H_2 To Distannynes Under Ambient Conditionsf

摘要

Dihydrogen reacts directly with a range of distannynes at ca. 25 ℃ under one atmosphere pressure to afford symmetric hydrogen bridged or unsymmetric stannylstannane products in high yield.rnThe activation of hydrogen by transition metal centers has been of long standing interest and has generated much discussion. The initial interaction of H_2 and the metal generally involves side-on a donation by the H-H bond and synergic back donation from filled metal d orbitals into the σ~* anti-bonding orbital of H_2. In contrast, there is an almost complete absence of a corresponding chemistry for main group molecular compounds. In 2005, it was shown that the reaction between the molecular species Ar'GeGeAr' (Ar' = C_6H_(3-)2,6(C_6H_3-2,6-Pr~i_2)_2) and H_2 at 1 atmosphere in hexane at 25 ℃ rapidly afforded a mixture of Ar'HGeGeHAr', Ar'H_2GeGeH_2Ar' and Ar'GeH_3 which represented the first example of H_2 activation by a main group element molecular species under mild conditions in the absence of a catalyst. Recently, the groups of Bertrand and Stephan demonstrated that H_2 reacted with an alkyl amino carbene or underwent reversible activation with main group compounds that incorporate frustrated Lewis acid-base pairs.