A tricarbonylmanganesetricarbonylchromiumThe mixture was again chromatographed on silica gel and, apart from unreacted starting materials, three compounds were isolated and each was recrystallized from petroleum --(60-80').These were (I) 2-benzyl-n-pyrrolylmanganese WE report the preparation and characterization of tricarbonyl, (11) 2-(n-benzylchromium tricarbonyl) pyrrole, 2-(n-benzylchromium tricarbony1)-n-pyrrolylmanganese tri-and a third compound (111) which was bright yellow in carbonyl which we believe to be the first reported compound colour and melted a t 103-104".This compound proved complex of 2-benzylpyrrole and the separate tricarbonylmetal complexes have been prepared and characterized.

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A formal, comprehensive evaluation of the personalized system of instruction was conducted in an introductory course. The results were promising and encouraging.

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Aus (III) werden durch Umsetzung mit Mangancarbonylen, wie (V), die π‐Pyrrolyl‐Mangan‐Komplexe (IV) und durch Umsetzung mit Chromhexacarbonyl (VI) die π‐Phenyl‐Chrom‐Komplexe (VII) dargestellt.