Benzene derivatives chromium carbonyl

Carbazole will react with 1 or 2 mol of ferrocene in hot decalin in the presence of aluminium-aluminium chloride producing crystalline derivatives in which either one or both" of the benzene rings is linked to iron, 25 and 26, respectively. The sandwich compound 25 was deprotonated to 27 with sodamide in liquid ammonia. A chromium carbonyl complex 28... 

Studies on various derivatives of ferrocene, cymantrene, benzene-chromium tricarbonyl, and butadieneiron tricarbonyl were recently reported (174, 176). Carbonyl derivatives containing the COR group lose CO to give an ion probably containing the R group attached to the metal, e.g. 

Miscellaneous Systems Other systems have been described [li,m] ferrocene/ carbon tetrachloride (a trichloromethyl radical is formed), ferrocene/carbon tetrabromide, metal carbonyl/onium salts (e.g., the [cyclopentadienyl Fe (CO)2]2/ diaryliodonium hexafluorophosphate combination where a phenyl radical is generated), benzene chromium tricarbonyl/halide derivative, and so on. 

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