1,5-Asymmetric induction during nucleophilic additions to arenetricarbonylchromium complexes: tricarbonyl(η6-1-methyl-4-{spiro[(1R,2S)-1,7,7-trimethylbicyclo[2.2.1]heptane-3,2′-1,3-dioxolan]-2-yloxy}benzene)chromium
نویسندگان
چکیده
The tricarbonylchromium unit bound to the arene ring of the chiral title complex, [Cr(C(19)H(26)O(3))(CO)(3)], is rotated by ca 25 degrees in agreement with the proposed mechanism for 1,5-asymmetric induction of nucleophilic attack.
منابع مشابه
[(1R)-3-Benzoyl-1,7,7-trimethylbicyclo[2.2.1]heptan-2-onato-κ2 O,O′]chlorido(η6-p-cymene)ruthenium(II)
The asymmetric unit of the title compound, [RuCl(C(10)H(14))(C(17)H(19)O(2))], contains two diastereomers. In both, the Ru(II) ion has a tetra-hedral coordination, formed by two O atoms of the camphor-derived ligand and the p-cymene and Cl ligands. In the crystal structure, weak inter-molecular C-H⋯Cl inter-actions link the mol-ecules into columns propagated along [010].
متن کاملHydrogen Bonding Patterns in a Series of 3-Spirocyclic Oxindoles
The crystal structures of the new compounds spiro[cyclohexane-1,3’-indol]-2’(1’H)-one (1), (rel-1R,2S)-spiro[bicyclo[2.2.1] heptane-2,3’-indol]-2’(1’H)-one (2) and spiro[indole-3,2’-tricyclo[3.3.1.1]decan]-2(1H)-one (3) have been determined by low temperature single crystal X-ray diffraction. The effects of substitution on the hydrogen bonding pattern is compared between all three compounds.
متن کاملSynthesis and X-ray Crystal Structures of Palladium(II) and Platinum(II) Complexes of the PCP-Type Chiral Tridentate Ligand (1R,1′R)-1,3-Bis[1-(diphenylphosphino)ethyl]benzene. Use in the Asymmetric Aldol Reaction of Methyl Isocyanoacetate and Aldehydes
Enantiomerically pure (1R,1′R)-1,3-bis[1-(diphenylphosphino)ethyl]benzene (4) has been obtained for the first time. The key step involves in situ tosylation of chiral (1S,1′S)-dimethyl1,3-benzenedimethanol (6) followed by nucleophilic attack with LiPPh2(BH3) to give [(1R,1′R)1,3-bis[1-(diphenylphosphino)ethyl]benzene]-bisborane (7). The bisborane-protected phosphine can be easily handled and pu...
متن کامل(1R,4R,7S)-1,7-Dimethyl-7-(phenylsulfonylmethyl)spiro[bicyclo[2.2.1]heptane-2,2′-1,3-dioxolane]
In the title compound, C(18)H(24)O(4)S, the chiral bicyclo-[2.2.1]heptane group is not symmetrical due to the influence of the substituents. The angle between the three-atom bridge plane and the four-atom planes of the boat-shaped six-membered ring are 55.07 (19) and 56.24 (19)°. The bridgehead angle is 92.75 (17)°.
متن کاملSyntheses of Novel Chiral Monophosphines, 2,5-Dialkyl-7-phenyl-7-phosphabicyclo- [2.2.1]heptanes, and Their Application in Highly Enantioselective Pd-Catalyzed Allylic Alkylations.
Design and synthesis of chiral phosphines have played a significant role in the development of transition metal catalyzed asymmetric reactions.1 Many excellent chiral bidentate phosphines such as DIPAMP,2 DIOP,3 Chiraphos,4 and BINAP5 have been developed for a variety of catalytic reactions. Recent additions to this family of ligands include the Duphos and BPE species of Burk and co-workers.6 T...
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عنوان ژورنال:
- Acta Crystallographica Section C: Crystal Structure Communications
دوره 64 شماره
صفحات -
تاریخ انتشار 2008