ISSN:
0009-2940
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Geometrical Isomerism of Tricarbonylcyclopentadieneiron Derivatives5-(Hydroxymethyl)-5-methylcyclopentadiene (6) reacts with Fe2(CO)9 to form tricarbonyl-[5-endo-(hydroxymethyl)-5-exo-methylcyclopentadiene]iron (2b) and tricarbonyl[5-exo-(hydroxymethyl)-5-endo-methylcyclopentadiene]iron (2c) in a 4 : 1 ratio. The isomers can be separated by chromatography. They represent the first example of geometrical isomerism in the tricarbonylcyclopentadieneiron series. Treatment of 5-(ethoxycarbonyl)-5-methyl-cyclopentadiene (5) with Fe2(CO)9 affords tricarbonyl[5-endo-(ethoxycarbonyl)-5-exo-methyl-cyclopentadiene]iron (2a) as the sole isomer. 1H n.m.r. data are used to establish the stereo-chemistry of these and related complexes.
Notes:
5-Methyl-5-hydroxymethyl-cyclopentadien (6) liefert mit Fe2(CO)9 Tricarbonyl-[5-exo-methyl-5-endo-hydroxymethyl-cyclopentadien-]-eisen (2b) und Tricarbonyl-[5-endo-methyl-5-exo-hydroxymethyl-cyclopentadien] eisen (2c) im Verhältnis 4 : 1. Die beiden Isomeren können chromatographisch getrennt werden. Sie sind das erste Beispiel geometrischer Isomerie in der Tricarbonyl-cyclopentadien-eisen-Reihe. 5-Methyl-5-äthoxycarbonyl-cyclopentadien (5) ergibt mit Fe2(CO)9 Tricarbonyl-[5-exo-methyl-5-endo-äthoxycarbonyl-cyclopentadien]-eisen (2a) als einziges Isomeres. 1H-NMR-Daten legen die Stereochemie der Komplexe und ihrer Derivate fest.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19711040914
