Be. Carpenter et al., Synthesis of the diborylated ferrocene 1,1 '-bis-(bis-pentafluorophenylboryl)ferrocene and the X-ray structure of its trimethylphosphine adduct, CAN J CHEM, 79(3), 2001, pp. 291-295
Citations number
25
Categorie Soggetti
Chemistry
Journal title
CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE
The diborylated ferrocene compound 1,1'-Fc[B(C6F5)(2)](2) (2) was prepared
via a transmetallation reaction involving 1,1'-Fc(HgCl)(2) and two equivale
nts of ClB(C6F5)(2). Although this reaction is very clean spectroscopically
, isolated yields of 2 were never greater than 40% owing to the high solubi
lity of the compound in non-donor solvents. Compound 2 is similar in its pr
operties to the related monoborylated complex FcB(C6F5)(2) (1) reported pre
viously, particularly the UV-vis spectrum, which exhibits an intense charge
transfer absorption (lambda (max) = 233 nm, epsilon = 1.64 x 10(4)) assign
able to an Fedz2/dx2-y2 --> B-p transition. However, 2, is significantly mo
re Lewis acidic than 1, reacting with weak donors such as acetonitrile at r
oom temperature, and effecting methide abstraction from Cp2ZrMe2 under mild
conditions. Complex 2 also forms a bis(trimethylphosphine) adduct (3), whi
ch was structurally characterized via X-ray crystallography.