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172ChemInform Abstract The new catalytic system consisting of dicyclopentadienyltitanium dichloride and trisisobutylaluminum catalyzes the rearrangement of cis,trans,trans-dodecatriene (I) to give the tricyclododecenes (V) and (VI), together with (VII), whereas with polyphosphoric acid a mixture of the octahydroacenaphthenes (II) and (III) is obtained. Both mixtures are hydrogenated and the resulting hydrocarbons (IV), (VII) and (VIII), or (VIII) and (IX) rearrange in the presence of aluminum tribromide, producing 1,3-dimethyladamantane (X). (NMR-, MS-data).

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p-Tolyliminoalkylruthenocenes --Schiff's bases of the ruthenocene series --react with sodium tetrachloropalladate in the presence of carboxylate anion similarly to their ferrocenyl analogs to give cyclopalladation products. The optical rotation values of the products resulting from carbonylation of palladated ferrocene and ruthenocene aldimines, prepared under conditions of asymmetric catalysis, followed by liberation of the aldehyde group were used to determine the stereochemistry and enantiomeric purity of the cyclopalladation products.

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