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Ein neuer Zugang zum ikosaedrischen closo ‐NB 11 ‐Gerüst
Author(s) -
Schneider Lenka,
Englert Ulli,
Paetzold Peter
Publication year - 1994
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19941270113
Subject(s) - chemistry , borane , icosahedral symmetry , crystallography , stereochemistry , boranes , ligand (biochemistry) , boron , catalysis , biochemistry , receptor , organic chemistry
A Novel Access to the Icosahedral closo NB 11 Skeleton At 200°C, the open skeleton of NB 9 H 12 is closed to the icosahedral skeleton of NB 11 H 10 Y ( 3 ) by the action of three equivalents of Et 3 N · BH 3 , whereby one equivalent forms a bridge Y = BH 2 NEt 2 CH 2 CH 2 between the adjacent cluster atoms N1 and B2; the product 3 crystallizes in the space group P ¯. With L · BH 3 (L = NMe 3 , SMe 2 ) instead of Et 3 N · BH 3 , the nido ‐borane NB 9 H 12 is transformed into the closo ‐borane (LBH 2 )NB 11 H 11 ( 4a, b ) at 140°C. By allowing t BuNH 2 to react with 4b , the N ‐bonded ligand Me 2 SBH 2 is removed with formation of the aza‐ closo ‐dodecaborate [ t BuNH 3 ] [NB 11 H 11 ], thus opening a new route to closo ‐NB 11 H 12 .