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η2‐ und η4‐[(Dimethylamino)vinylboran]eisencarbonyl‐Komplexe
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η2‐ and η4‐[(Dimethylamino)vinylborane]iron Carbonyl Complexes1)Amino‐vinylboranes can act as η2 (via the C = C bond) and as η4 ligands (via the C = C and B = N group) in iron carbonyl complexes. From bromo(dimethylamino)vinylborane and (dime‐thylamino)methylvinylborane and Fe2(CO)9 [η2‐bromo(dimethylamino)vinylborane] tetracarbonyliron (1) and tetracarbonyl[η2‐(dimethylamino)methylvinylborane]iron (2), respectively, are formed in the absence of light. The η2 coordination via the C = C group in 1 is proved by an X‐ray structure analysis. The C2BN frame is trans‐arranged. By the action of light, 1 and 2 are transferred into the very unstable tetrahapto complexes [η4‐bromo(dimethylamino)vinylborane]tricarbonyliron (3) and tricarbonyl[η4‐(dimethylamino)methylvinylborane]‐ iron (4), which can only be investigated in solution. By using tert‐butyl(dimethylamino)vinylborane the reaction leads, even in the absence of light, directly to [η4‐tert‐butyl(dimethylamino)vinylborane)tricarbonyliron (5), a compound likewise easily unstable. The transition of the η2 into the η4 complexes can be followed IR‐ and 11B‐NMR‐spectroscopically.
Title: η2‐ und η4‐[(Dimethylamino)vinylboran]eisencarbonyl‐Komplexe
Description:
η2‐ and η4‐[(Dimethylamino)vinylborane]iron Carbonyl Complexes1)Amino‐vinylboranes can act as η2 (via the C = C bond) and as η4 ligands (via the C = C and B = N group) in iron carbonyl complexes.
From bromo(dimethylamino)vinylborane and (dime‐thylamino)methylvinylborane and Fe2(CO)9 [η2‐bromo(dimethylamino)vinylborane] tetracarbonyliron (1) and tetracarbonyl[η2‐(dimethylamino)methylvinylborane]iron (2), respectively, are formed in the absence of light.
The η2 coordination via the C = C group in 1 is proved by an X‐ray structure analysis.
The C2BN frame is trans‐arranged.
By the action of light, 1 and 2 are transferred into the very unstable tetrahapto complexes [η4‐bromo(dimethylamino)vinylborane]tricarbonyliron (3) and tricarbonyl[η4‐(dimethylamino)methylvinylborane]‐ iron (4), which can only be investigated in solution.
By using tert‐butyl(dimethylamino)vinylborane the reaction leads, even in the absence of light, directly to [η4‐tert‐butyl(dimethylamino)vinylborane)tricarbonyliron (5), a compound likewise easily unstable.
The transition of the η2 into the η4 complexes can be followed IR‐ and 11B‐NMR‐spectroscopically.
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