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Synthesis and Structures of Amino(triphenylgermyl) Boranes and Trihydro(triphenylgermyl) Borates
Author(s) -
Habereder Tassilo,
Nöth Heinrich
Publication year - 2001
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200105)627:5<1003::aid-zaac1003>3.0.co;2-e
Subject(s) - boranes , borazine , diborane , chemistry , borane , steric effects , boron , ring (chemistry) , stereochemistry , crystallography , medicinal chemistry , organic chemistry , boron nitride , catalysis
The B‐(triphenylgermyl)borazines 4 a and 4 b , the 1,2‐bis(dimethylamino)‐1,2‐bis(triphenylgermyl)‐diborane(4), 5 , and the (2,2,6,6‐tetramethylpiperidino)(triphenylgermyl)‐boranes 6 and 7 were prepared by allowing LiGePh 3 to react with the corresponding B‐bromoborazines and aminochloroboranes, respectively. BH 3 dissolved in thf readily adds to LiGePh 3 generating Li(H 3 BGePh 3 ), 8 a , in thf solution. Addition of N‐bases to the solution of 8 a produced (tmen · thf)Li(H 3 BGePh 3 ), 8 b , and dimeric (py) 2 Li(H 3 BGePh 3 ), 8 c . The borazine ring in 4 b is distorted into a boat shape. In 5 the NBGe planes are twisted against each other by 85°. Comparison with analogous (triphenylstannyl)boranes points to a more pronounced steric effect of the Ph 3 Ge group over the Ph 3 Sn group due to the shorter B–Ge bond. A fairly short B–Ge bond is found for the (triphenylgermyl)trihydroborates. The molecular structure of (Et 2 O) 3 LiGePh 3 shows compressed C–Ge–C bond angles. Its molecular parameters fit well into the series L n LiEPh 3 (E = Si, Sn, Pb).