Abstract
cis-Tetracarbonyltrimethylphosphinemethylmethoxycarbenechromium(0) reacts with BF 3 with splitting off of the methoxy group and substitution of a CO ligand. The product formed was identified as mer-(BF 4)Cr(CO) 3 [P(CH 3) 3](CCH 3). This new complex, which contains a BF 4-group coordinated to the Cr-atom, is most sensitive to moisture. With water it reacts to give { mer-H 2OCr(CO) 3[P(CH 3) 3](CCH 3)} +[BF 4] −. IR, 1H NMR, 13C NMR and 31P NMR spectra of the new compounds are discussed.
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