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- W1993183295 abstract "The five-co-ordinate complex [Mo(NC6H3Pri2-2,6)2(PMe3)2(C2H4)]2a has been prepared via treatment of [Mo(NC6H3Pri2-2,6)2Cl2(dme)]1a(dme = 1,2-dimethoxyethane) with 2 equivalents of EtMgCl in Et2O in the presence of excess PMe3; its propene analogue 2b is unstable at reduced pressure, converting to [Mo(NC6H3Pri2-2,6)2(PMe3)2]3 with loss of propene. Complex 2a can also be synthesised, and 2b generated in situ, by treatment of 3 with ethene and propene respectively in hydrocarbon solvent; the analogous η2-butadiene complex [Mo(NC6H3Pri2-2,6)2(PMe3)2(η2-C4H6)]2c has also been generated in solution and identified by NMR spectroscopy. The molecular structure of 2a shows a distorted trigonal-bipyramidal co-ordination geometry with axial phosphines and equatorial imido ligands: the ethene ligand aligns in the P–Mo–P plane and perpendicular to the N–Mo–N plane. Complex 3 can also be prepared directly through the reaction of 1a with magnesium turnings in tetrahydrofuran (thf) in the presence of excess PMe3. By contrast, the reaction of [Mo(NBut)2CI2(dme)]1b under identical conditions affords the binuclear imido-bridged complex [{Mo(NBut)(µ-NBut)(PMe3)}2]4. Complex 4 does not react with ethene or propene to give the known mononuclear bis(tert-butylimido) derivatives, [Mo(NBut)2(PMe3)(C2H3R)](R = H 5a or Me 5b) reflecting the robust nature of the imido bridges." @default.
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- W1993183295 date "1995-01-01" @default.
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- W1993183295 title "Four-versus five-co-ordinate bis(imido) alkene complexes of molybdenum: the contrasting effects of tert-butyl- and 2,6-diisopropylphenyl-imido substituents" @default.
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- W1993183295 doi "https://doi.org/10.1039/dt9950003313" @default.
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