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  • Author: Hellmut Singer x
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Exchange of one cyclopentadienylring in different ferrocenes by tetra- or dimethylthiophene gives cationic thiophenecyclopentadienyl-iron(II)-complexes, which were characterized spectroscopically.

Pyridine-2-thiolato complexes of copper(I) and cobalt (III) have been prepared from copper(II)- and cobalt(III)-acetylacetonate with pyridine-2-thiol as well as by reacting CuCl(pyridine-2-thiol)3 and CoCl2-(pyridine-2-thiol)2 with a base. The copper(I) complex forms an addition product of low stability with triphenylphosphine. The cobalt complex is monomeric whereas according to its mass spectrum pyridine-2-thiolato-copper(I) appears to be tetrameric.

Exchange of the cyclopentadienyl ligand from methylcyclopentadienyl-manganese-tricarbonyl by benzene, toluene, xylene, mesitylene and other aromatics with AlBr3 as catalyst gives cationic aromatic manganesetricarbonyl complexes. The amount of AlBr3 and the addition of aqueous HBr do not only influence the yield but also the purity of the products. With this new method

C6H6Mn(CO)3+

can be prepared in high yield from a relatively inexpensive starting material.

Hexachloro-bicycloheptenes and heptadienes with hydroxymethyl-substituents in the 2 and 3 position show non-equivalence of the methylene protons in their NMR spectra. This is caused both by hindered rotation and the asymmetry of the molecules. For some molecules the spectroscopic data allow conclusions to be made concerning the conformation of the substituents.