Ansa-aminoborane

Solid state NMR was used to show the mechanism of reversible hydrogen activation by ansa-aminoboranes, l-N-TMPH-CH2-2-[HB(C6F5)(2)]C6H4 (NHHB), as well as other techniques. ... 

A very interesting FLP catalyst design was recently disclosed by Repo, Rieger and co-workers [38], Coined the ansa-aminoborane [39] FLP catalyst, it is based on the use of amines instead of phosphines as the Lewis basic component (Scheme 6.19). This catalyst is also active in 10 mol% quantities for the reduction of imines and enamines. The X-ray structure of the ansa-catalyst is illustrated below (Fig. 6.6). 

The terms ansa-aminoborane [ansa (lat.) = handle ] refer to the use of the successful concept of ansa- metallocenes where a bridge between two Cp-Ugands forces them into a distinct geometry and hence nfluences the specific reactivity of these compounds. 

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See also in sourсe #XX -- [ ]

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