Molybdenum fluoro

N-Donor Ligands. The full account of the crystal structure of [Mo02(8-hydroxyquinolate)2] has been published. The dimensions of the M0O2 unit are O—Klo—O = 104.C and Mo—O = 171(2) pm. The electrochemistries of this and the related molybdenum(v) complex. [ MoO(8-hydroxyquino-late)2 2 0], have been investigated as simple models of molybdenum-fluoro-protein enzymes (p. 146). Reduction of the molybdenum(vi) complex occurs in two one-electron steps with solvent attack of the reduced intermediates and displacement of the 8-hydroxyquinolato-groups. ... 

An efficient synthetic route to (10Z)- and (10 )-19-lluoro-la,25-dihydroxy vitamin D3 has been developed (488). The key feature of this pathway is the introduction of a 19-fluoromethylene group to a (5 )-19-nor-10-oxo-vitamin D derivative. The 10-oxo compound 445 has been obtained via a 1,3-dipolar cycloaddition reaction of (5 )-la,25-dihydroxyvitamin D with in situ generated nitrile oxide, followed by ring cleavage of the formed isoxazoline moiety with molybdenum hexacarbonyl. Conversion of the keto group of (5 )-19-nor-10-oxo-vitamin D to the E and Z fluoromethylene group has been achieved via a two-step sequence, involving a reaction of lithiofluoromethyl phenyl sulfone, followed by the reductive de-sulfonylation of the u-lluoro-j3-hydroxysulfone. The dye-sensitized photoisomerization of the (5 )-19-fluorovitamin D affords the desired (5Z)-19-fluorovitamin D derivatives, (10Z)- and (10 )-19-fluoro-la,25-dihydroxy-vitamin D3. 

F7Mo02PsC34H4B, Molybdenum(II), dicar-bonylbis[ 1,2-ethanediylbis(diphenyl-phosphine)]fluoro-hexafluorophosphate(l -), 26 84... 

The substituents fluoro. chloro, bromo, cyano, nitro, alkoxycarbonyl, A.yV-dialkylaminocar-bonyl and dialkylphosphonyl do not interfere with the molybdenum(Vl) fluoride reactions, but hydroxy, alkoxy, amino, dialkylamino and alkene groups do.9,10... 

Despite this they should be considered as possible alternatives in cases where more familiar methods fail. Amongst this group of activators are p-toluenesulfonyl chloride, tiifluoromethanesulfonic anhy-dride,silver tetrafluoroborate, molybdenum oxide, phosphorous pentoxide, trichloromethyl chloroformate, 2-fluoro-l-methylpyridiniumsulfonate, chlorosulfonyl isocyanate, antimony penta-chloride (for which an X-ray structure of the DMSO-SbCb conqilex was obtained) and phenyl dichlo-rophosphate. ... 

PF6Fe07C,iH ), Iron(l + ), (ri -cyclopenta-dienyl)dicarbonyl(tetrahydrofuran)-, hexafluorophosphate(l -), 26 232 PFftFeaOsCiiiHij, Iron(l + ), p-acetyl-C 0-bis[dicarbonyl(T]-cyclopentadienyl)-, hexafluorophosphate(l -), 26 235 PF7M0O2C5JH4, Molybdenum(II), dicar-bonylbis[ 1,2-ethanediylbis(diphenyl-phosphine)]fluoro-, hexafluorophos-phate(l -), 26 84 PFe04Ci2H, Iron, tetracarbonyl-... 

OTHER COMMENTS used in the manufacture of fluoro-chemicals and plastics used as one component of liquid rocket fuel and in chemical lasers chemical intermediate for sulfur hexafluoride, chlorine trifluoride, bromine trifluoride, uranium and molybdenum hexafluoride and oxygen difluoride. 

F7Mo02PsC,4H4g, Molybdenum(IlX dicarbonylbis[l,2-ethanediylbi -(diphenylphosphine)]fluoro-, hexa-fluoropho phate(l —X 26 84... 

Molybdenum and Tungsten.— The anion [(7r-CsH6)(CO)2(Ph3P)Mo] displaces fluorine from activated fluoro-aromatic compounds, yielding complexes (215) and (216) with pentafluoropyridine and tetrafluorophthalonitrile, respectively. ... 

In this case, the nonequivalence of the Fc and Fm atoms can arise only upon the coordination of the ligand, with the N and O atoms are situated in the equatorial plane. These complexes are structurally similar to molybdenum [48, 49] and tungsten [50-53] peroxofluorides and shaped like a pentagonal bipyramid, whose equatorial plane contains three fluoro atoms (Fa, Fc, Fm) besides O and N atoms. The axial sites are occupied by a fluorine atom (Fx) and the double-bonded oxygen atom ... 

---