A 2,2' : 6',2" : 6,6-tris(ethano)triarylborane was synthesized and its conformational analysis involving X-ray structure determination and molecular mechanics (MM2) calculation is examined.Co n fo r m at i o n s a n d conformation a 1 isom e ri za t i o n of t r i ar y 1boranes have received considerable interest. Dynamic NMR studies of several triarylboranes having relatively bulky substitutcnts on the aryl groups have been investigated by Mislow and coworkers. They showed stereoisomerization of these propeller type of compounds proceeds viu two ring flip mechanism with activation barrier of 14-18 kcal mol (1 cal = 4.184 J).' We have recently reported the synthesis and s t e re oi so me r iza t ion of e t h a n obridged t r i ar y 1 bo r a n e s la-c and succeeded in resolving l b and c into optically pure form for the first time in solution at room temperature.2 In this paper we report the synthesis and conformational analysis of the symmetrically bridged 2,2' : 6',2" : 6".6-tris(ethano)triarylborane 2 which is the ultimate compound in this series of c t h a n obridged t r i ar y l bor a n e s .

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