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While the diphosphadiboretane (tBuP=Btmp) 2 , 1, reacts with boron trihalides BX 3  (X = Cl, Br, I) with BN cleavage producing a number of unidentifiable products, a new tricyclic BP ring system 2, containing B 3 P 3 , PB 2 C 2  and C 6  rings, results from the combination of PhBCl 2  and 1. B-Chlorocatecholborane and 1 give access to the diborylphosphane 3, tmpBCl-PtBu-cat (cat = C 6 H 4 O 2 B). This shows that the selectivity of the reactions increases as the Lewis acidity of boron halide decreases. The structure of compounds 2 and 3 were determined by X-ray structure analysis. The bicyclic (tmpBP) 2  4 forms no adducts with MeI, CF 3 SO 2 Me or Ph 3 C(SnCl 5) . However, it adds B(C 6 F 5 ) 3  to give 10, the first BX 3  adduct of this bicycle that is fully characterized including its molecular structure.

zeitschrift für naturforschung b

Behavior of 1,3-Di(tert-butyl)-2,4-bis(tetramethylpiperidino)-1,3,2,4-diphospha- diboretane towards Boron Halides and Adduct Formation of a Bicyclo[1.1.0]diphosphadiboretane with Tris(pentafluorophenyl)borane [1]