Excellent Chiral Induction by Diene Iron-Tricarbonyl Moiety. I. Diastereoselective (4+2)Type Cycloaddition of 1-Azatriene Iron-Tricarbonyl Complex.
نویسندگان
چکیده
منابع مشابه
Transition metal complexes in organic synthesis. Part 47.1 Organic synthesis via tricarbonyl(h4-diene)iron complexes
The protection of conjugated dienes by coordination to the tricarbonyliron fragment offers many potential applications of the resulting complexes to organic synthesis. The preparation of tricarbonyl(h4-1,3-diene)iron complexes is readily achieved by a 1-azabutadiene-catalyzed complexation of the free ligands. An asymmetric catalytic complexation of prochiral cyclohexa-1,3-dienes with pentacarbo...
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Complexation of (tricarbonyl)iron to an acyclic diene serves to protect the ligand against oxidation, reduction and cycloaddition reactions while the steric bulk of this adjunct serves to direct the approach reagents to unsaturated groups attached to the diene onto the face opposite to iron. Furthermore, the Fe(CO)(3) moiety can serve to stabilize carbocation centers adjacent to the diene (i.e....
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A new chiral iron porphyrin-based catalyst performed α-methylstyrene stereoselective cyclopropanation with excellent yields (up to 99%), enantio- and diastereoselectivities (ee(trans) up to 87%, trans/cis ratios up to 99 : 1) and outstanding TON and TOF values (up to 20,000 and 120,000 h(-1) respectively).
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In the title molecule, C(9)H(3)Cl(3)O(3), there are three short interactions involving the benzene H atoms and the chloro-formyl Cl atoms. In the crystal, mol-ecules stack along the a axis with no significant non-bonded inter-actions.
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The title compound, [W(C(5)H(5))(HOBF(3))(CO)(3)], has a four-legged piano-stool geometry which is typically found for C(5)H(5)W(CO)(3)X complexes. The HOBF(3)(-) anion is the hydrolysis product of BF(4)(-) and is coordinated via oxygen.
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ژورنال
عنوان ژورنال: Chemical and Pharmaceutical Bulletin
سال: 1995
ISSN: 0009-2363,1347-5223
DOI: 10.1248/cpb.43.559