The suprising activity of the action of 1 against Ehrlich ascites tumor in mice must be explainable in terms other than that of the activity of the metallocene dihalogenides of d-electron-deficient transition-metals, since the anions in 1 are not coordinated but bound in a salt-like way. Ferrocene is inactive in the same test.
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Köpf‐Maier et al. (1984) studied this question.
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