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231223s2005 xx ||||| 00| ||eng c |
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|a pubmed25n0537.xml
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|a (DE-627)NLM161004911
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|a (NLM)16508693
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Blum, Suzanne A
|e verfasserin
|4 aut
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| 245 |
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|a Synthetic and Mechanistic Studies of Strained Heterocycle Opening Reactions Mediated by Zirconium(IV) Imido Complexes
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|c 2005
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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| 338 |
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|a Band
|b nc
|2 rdacarrier
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|a Date Revised 29.09.2020
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a The reactions of the bis(cyclopentadienyl)(tert-butylimido)zirconium complex (Cp(2)Zr=N-t-Bu)(THF) (1) with epoxides, aziridines, and episulfides were investigated. Heterocycles without accessible beta-hydrogens undergo insertion/protonation of the C-X bond to produce 1,2-amino alcohols (X = O) and 1,2-diamines (X = NR), whereas heterocycles with accessible beta-hydrogens undergo elimination/protonation to produce allylic alcohols (X = O) and allylic sulfides (X = S). Mechanistic investigations support a stepwise pathway with zwitterionic intermediates for the first reaction class and a concerted pathway for the second reaction class. Additionally, the feasibility of chirality transfer from the planar-chiral ebthi (ebthi = ethylenebis(tetrahydroindenyl)) ligand was demonstrated with a chiral analogue, (ebthi)-Zr=NAr(THF) (Ar = 2,6-dimethylphenyl), 2, through the diastereoselective ring opening of meso epoxides
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|a Journal Article
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| 700 |
1 |
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|a Rivera, Vicki A
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Ruck, Rebecca T
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Michael, Forrest E
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Bergman, Robert G
|e verfasserin
|4 aut
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| 773 |
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8 |
|i Enthalten in
|t Organometallics
|d 1998
|g 24(2005), 7 vom: 28. März, Seite 1647-1659
|w (DE-627)NLM098167103
|x 0276-7333
|7 nnas
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| 773 |
1 |
8 |
|g volume:24
|g year:2005
|g number:7
|g day:28
|g month:03
|g pages:1647-1659
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|a GBV_USEFLAG_A
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|a GBV_NLM
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| 912 |
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|a GBV_ILN_350
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| 951 |
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|a AR
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| 952 |
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|d 24
|j 2005
|e 7
|b 28
|c 03
|h 1647-1659
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