Study of the Origin of the Hindered Rotation of an Aryl Ring in the Chromium Aminocarbene Complexes Bearing Aromatic Ring Attached to the Carbene Carbon Atom.

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F06%3A00016996" target="_blank" >RIV/60461373:22310/06:00016996 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Study of the Origin of the Hindered Rotation of an Aryl Ring in the Chromium Aminocarbene Complexes Bearing Aromatic Ring Attached to the Carbene Carbon Atom.

Original language description

Substituted chromium aminocarbene complexes cis-tetracarbonyl[(h2-N-allyl-N-allylamino)(4-X-phenyl)carbene]chromium(0) (X = MeO, Me, H, Cl, CO2Me and CF3) were prepared by the reaction of the corresponding N,N-diallylamides with Na2Cr(CO)5 and Me3SiCl. Using dynamic NMR, the rotational barrier of the aryl ring in these complexes was established. The obtained values are higher for the complexes bearing electron-acceptors compared to those bearing donor substituents and correspond with the Hammett equation. This indicates that the restricted rotation of aryl ring in the chromium aminocarbene complexes is a balance between steric and conjugation effects; while the former increases the barrier, the latter decreases it by stabilizing of the transition stateof the rotation. This finding is compatible with the fact, that in the related cis-tetracarbonyl[(N-alkyl-h2-N-allylamino)(phenyl)carbene]chromium(0) complexes (alkyl = Me, Et and i-Pr) the rotational barrier grows steadily with the grow

Czech name

Studium původu bráněné rotace aromátu v aminokarbenových komplexech chromu nesoucích aromatický kruh vázaný na karbenový atom uhlíku.

Czech description

Pomocí 1H NMR byly stanoveny bariéry rotace aromátu v cis-tetrakarbonyl[(h2-N-allyl-N-allylamino)(4-X-fenyl)carben]chromium(0) (X = MeO, Me, H, Cl, CO2Me and CF3) .

Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

CC - Organic chemistry

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2006

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Organometallics

ISSN

0276-7333

e-ISSN

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Volume of the periodical

25

Issue of the periodical within the volume

23

Country of publishing house

US - UNITED STATES

Number of pages

9

Pages from-to

5540-5548

UT code for WoS article

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EID of the result in the Scopus database

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