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Deprotonation of B , B ′‐Di‐ tert ‐butyl‐ B , B ′‐difluorenyldiborane(4) and the Structure of the Di‐ tert ‐butyl‐difluorenylidenediborate(2−) Anion
Author(s) -
Littger Ralf,
Nöth Heinrich
Publication year - 2000
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200007)2000:7<1571::aid-ejic1571>3.0.co;2-4
Subject(s) - chemistry , deprotonation , substituent , boranes , ether , medicinal chemistry , stereochemistry , ring (chemistry) , molecule , ion , center (category theory) , crystallography , boron , organic chemistry
In contrast to the deprotonation of the diorganyl(fluorenyl)boranes t Bu 2 B(fl‐H) and Me 2 B(fl‐H), which cannot be achieved uniformly, the deprotonation of B 2 ( t Bu) 2 (fl‐H) 2 in THF proceeds smoothly to give the anion B 2 ( t Bu) 2 (fl) 2 2− . The isolated salts have been identified as [Na(thf) n ] 2 [B 2 t Bu 2 (fl) 2 ] and [Na(thf)(OEt 2 ){Na(OEt 2 ) 2 }][B 2 t Bu 2 (fl) 2 ]. The X‐ray structure of the latter compound reveals a longer B−B bond [1.744(9) Å] than that in the parent compound B 2 ( t Bu 2 )(fl‐H) 2 [1.687(7) Å]. One sodium center is coordinated to the five‐membered ring of one fluorenylidene substituent, while the other is coordinated to three C atoms of one of the six‐membered rings. This results in a rather asymmetric structure. Each sodium center is also coordinated by two ether ligands.