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Dialkyl(η 5 ‐cyclopentadienyl)chromium Derivatives with Extreme Values of 1(2 H‐NMR Parameters
Author(s) -
Grohmann Andreas,
Köhler Frank H.,
Müller Gerhard,
Zeh Harald
Publication year - 1989
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19891220518
Subject(s) - chemistry , cyclopentadienyl complex , chromium , nuclear magnetic resonance spectroscopy , hydrogen , crystallography , stereochemistry , medicinal chemistry , organic chemistry , catalysis
Abstract The title compounds CpCrR 2 (PR 3 ′) (R = CH 3 , CH 2 C 6 H 5 , CH 2 SiMe 3 ) and Cp ★ Cr(CH 3 ) 2 (PMe 3 ) ( 3b ) have been prepared, and a piano‐stool geometry has been established for 3b by X‐ray structure analysis. Convenient observation of the hydrogen atoms 1′‐H of R is only possible by 2 H NMR giving signals which are up to 6200 Hz broad and shifted up to –1373 ppm.