119841-54-2Relevant academic research and scientific papers
Erste asymmetrische Synthese β-binaphthylgestuetzter Silane, Stannane und Borane
Gross, Ulrich-Maria,Bartels, Michael,Kaufmann, Dieter
, p. 277 - 284 (2007/10/02)
Starting with differently metallated 2,2'-dimethyl-1,1'-binaphthyls, various synthetic approaches to dihydrodinaphthoborepines (2) were attempted.As the borylation of the open chain derivetives (4a, b) did not succeed under cyclization, the (R)-dihydronaphthosilepine (5a) and the (R)- and (s)-dihydrodinaphthostannepines (7a) were prepared first, by starting from the enantiomerically pure bisbenzyllithium compounds (4a).The reaction of 5a with boron tribromide and of 7a with dichloroethylborane led exclusively to a halogen-methyl exchange reaction, to give the bromodihydrosilepine (5b) and the chlorodihydrostannepine (7b), while reaction of 7a with trichloroborane predominantly led to the formation of chlorodihydroborepine (2a).
