Abstract: A compound of the general formula I(BH.sub.n).sub.m [RuX.sub.3+nm-q-r.sup.(OH).sub.r (BH.sub.p).sub.3-nm+q ].sub.1+p+q IwhereinB denotes a mononuclear or polynuclear basic heterocyclic radical containing one or more nitrogen atoms,X denotes chlorine or bromine,m denotes 1 or 2,n denotes 1 or 2, the sum of n and m being not greater than 3,p denotes 0 or 1, but not 1 if n is 1,q denotes 0 or 1, but not 1 if p is 1 andr denotes 0 or 1,show an antitumoral activity and are therefore suitable as a chemotherapeutic for the treatment of cancers.

Abstract: Complexes of the general formula I[R.sup.1 (CH.sub.2).sub.m C(O)CR.sup.3 C(O)R.sup.2 ].sub.2+n MX.sub.2-n (I)wherein M denotes tin, titanium, zirconium or hafnium, R.sup.1 denotes hydrogen or a phenyl radical, it being possible for the phenyl radical to be monosubstituted or polysubstituted by fluorine, chlorine, bromine, nitro, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy or trifluoromethyl, R.sup.2 denotes methyl or R.sup.1, with the exception of hydrogen, R.sup.3 denotes hydrogen or chlorine, X denotes fluorine, chlorine or bromine, but not fluorine if M denotes zirconium or hafnium, m denotes the number 1 or 0, or, if R.sup.1 denotes hydrogen, the number 1 and n denotes the number 0, or, if M denotes zirconium or hafnium, the number 1 or 0, exhibit a cytostatic activity which is comparable to that of cisplatin and are less toxic than cisplatin. They are suitable for the produduction of medicaments having an anti-neoplastic action.

Abstract: Metal complexes of the general formula I[R.sup.1 (CH.sub.2).sub.m C(O)CR.sup.3 C(O)R.sup.2 ].sub.2 M(OR.sup.4).sub.2-n X.sub.n (I)wherein M denotes titanium, zirconium or hafnium, R.sup.1 denotes hydrogen, C.sub.1 -C.sub.8 -alkyl or phenyl, which can be monosubstituted or polysubstituted by fluorine, chlorine, bromine, nitro, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy or trifluoromethyl, R.sup.2 denotes C.sub.1 -C.sub.8 -alkyl, or phenyl, which can be monosubstituted or polysubstituted by fluorine, chlorine, bromine, nitro, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy or trifluoromethyl, R.sup.3 denotes hydrogen or phenyl, R.sup.4 denotes C.sub.1 -C.sub.18 -alkyl, which can be substituted by hydroxyl, C.sub.1 -C.sub.3 -alkylamino or alkali metal sulfonato groups, or denotes C.sub.5 -C.sub.8 -cycloalkyl, which can be substituted by C.sub.1 -C.sub.