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rdf:type
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Description
| - Aminocarbene complexes having a methyl group in the o-position to the aminocarbene moiety on the aromatic ring, (S)-pentacarbonyl[(N,N-dimethylamino)-(3-methoxycarbonyl-2-methylphenyl)carbene]chromium(0) [(S)-6] and (R)-pentacarbonyl[(N,N-dimethylamino)-(5-methoxycarbonyl-2-methylphenyl)carbene]chromium(0) [(R)-7] were prepared in enantiomerically pure form by the crystallization of diastereoisomeric esters with (S)-1-(1-naphthyl)ethanol. In the case of (S)-6 the racemization barrier DG?rac=(121 ? 0.5) kJxmol-1 was established. The substitution of o-methyl group with isopropyl group did not virtually change the racemization barrier (DG?rac= (120.5 ? 0.5) kJxmol-1), while the introduction of o-phenyl group led to substantial lowering of DG?rac. Attempts to transfer chirality in thermal reactions of the complexes (S)-6 and (R)-7 with alkynes, palladium-catalyzed insertion into C-H bond and photochemical formation of b-lactams were unsuccessful.
- Aminocarbene complexes having a methyl group in the o-position to the aminocarbene moiety on the aromatic ring, (S)-pentacarbonyl[(N,N-dimethylamino)-(3-methoxycarbonyl-2-methylphenyl)carbene]chromium(0) [(S)-6] and (R)-pentacarbonyl[(N,N-dimethylamino)-(5-methoxycarbonyl-2-methylphenyl)carbene]chromium(0) [(R)-7] were prepared in enantiomerically pure form by the crystallization of diastereoisomeric esters with (S)-1-(1-naphthyl)ethanol. In the case of (S)-6 the racemization barrier DG?rac=(121 ? 0.5) kJxmol-1 was established. The substitution of o-methyl group with isopropyl group did not virtually change the racemization barrier (DG?rac= (120.5 ? 0.5) kJxmol-1), while the introduction of o-phenyl group led to substantial lowering of DG?rac. Attempts to transfer chirality in thermal reactions of the complexes (S)-6 and (R)-7 with alkynes, palladium-catalyzed insertion into C-H bond and photochemical formation of b-lactams were unsuccessful. (en)
- Aminokarbenové komplexy chromu nesoucí methylovou skupinu v o-poloze aromatického kruhu byly rozštěpeny na enentiomery. (cs)
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Title
| - Enantiomerically Pure Axially Chiral Aminocarbene Complexes of Chromium
- Enantiomerně čisté axiálně chirální aminokarbenové komplexy chromu (cs)
- Enantiomerically Pure Axially Chiral Aminocarbene Complexes of Chromium (en)
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skos:prefLabel
| - Enantiomerically Pure Axially Chiral Aminocarbene Complexes of Chromium
- Enantiomerně čisté axiálně chirální aminokarbenové komplexy chromu (cs)
- Enantiomerically Pure Axially Chiral Aminocarbene Complexes of Chromium (en)
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skos:notation
| - RIV/60461373:22310/08:00020041!RIV09-MSM-22310___
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http://linked.open...avai/riv/aktivita
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http://linked.open...avai/riv/aktivity
| - P(GA203/00/1240), P(GA203/04/0487), Z(MSM0021620857), Z(MSM6046137301)
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http://linked.open...iv/cisloPeriodika
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http://linked.open...vai/riv/dodaniDat
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http://linked.open...aciTvurceVysledku
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http://linked.open.../riv/druhVysledku
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http://linked.open...iv/duvernostUdaju
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http://linked.open...titaPredkladatele
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http://linked.open...dnocenehoVysledku
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http://linked.open...ai/riv/idVysledku
| - RIV/60461373:22310/08:00020041
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http://linked.open...riv/jazykVysledku
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http://linked.open.../riv/klicovaSlova
| - aminokarbene complexes of chromium; axial chirality; enantiomers (en)
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http://linked.open.../riv/klicoveSlovo
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http://linked.open...odStatuVydavatele
| - US - Spojené státy americké
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http://linked.open...ontrolniKodProRIV
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http://linked.open...i/riv/nazevZdroje
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http://linked.open...in/vavai/riv/obor
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http://linked.open...ichTvurcuVysledku
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http://linked.open...cetTvurcuVysledku
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http://linked.open...vavai/riv/projekt
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http://linked.open...UplatneniVysledku
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http://linked.open...v/svazekPeriodika
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http://linked.open...iv/tvurceVysledku
| - Císařová, Ivana
- Dvořák, Dalimil
- Drahoňovský, Dušan
- Meca, Luděk
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http://linked.open...ain/vavai/riv/wos
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http://linked.open...n/vavai/riv/zamer
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issn
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number of pages
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http://localhost/t...ganizacniJednotka
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