room temperature with insertion of the alkyne into the metalcarbene bond to give alkenyl(amin0)carbene complexes[2]. On warming a typical representative of this class of compounds, pentacarbonyl[diethylamino(cL-diethylamino-P-methoxystyryl)carbene]chromium ( I ) , in decane, a CO ligand cis to the carbene ligand is substituted intramolecularly by the amino function of the styryl substituent, leading to formation of the tetracarbonyl complex (2). Stronger heating of the solution results in the loss of further CO and attack of the carbene-carbon at the ortho position of the phenyl ring. Thus cyclization occurs to give the 2,3-bis(diethylamino)-l-methoxyindene, which remains coordinated as the tricarbonyl complex ( 3 )
Feld und der Briickenprotonen bei hohem Feld (Tabelle 1) mit der Existenz eines Ringstroms zu vereinbaren ist. Auch das protonenentkoppelte 13C-NMR-Spektrum (Tabelle 1) ist mit dieser Vorstellung in Einklang.
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