Organic compounds -- part of the class 532-570 series – Organic compounds – Heavy metal containing
Patent
1991-12-09
1993-12-07
Dees, Jose' G.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heavy metal containing
556 12, 556 43, 556 53, 556 87, C07F 728, C07F 1700
Patent
active
052684954
ABSTRACT:
The invention relates to a process for the preparation of a compound of the formula XI ##STR1## wherein preferably M.sup.1 is zirconium, the radicals R.sup.1 are alkyl, the radicals R.sup.2 are halogen or alkyl, R.sup.3 is dimethylsilyl or ethylene and n is 2-18, wherein a compound of the formula II ##STR2## is reacted with an alkali metal or alkaline earth metal salt of a malonic ester and then with an alkyl halide, the reaction product is converted by decarboxylation into the corresponding lactone, which is further reacted by known methods to give the compound XI.
The compounds of the formula XI, some of which are novel, can advantageously be used as catalysts for olefin polymerization.
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Journal of Organic Chemistry, Bd. 39, Nr. 18, (1974), pp. 2783-2787.
Experientia 11, (1955) p. 115.
J. Chem. Soc. Chem. Commun. (1978), pp. 601-602.
Tetrahedron Lett. (1977), pp. 159-162.
C. R. Acad. Sci. Paris 267 (1968), pp. 467-470.
Mise, T. et al, Chemistry Letters, Japan, The Chemical Society of Japan, (1989), pp. 1853-1856.
Herrmann Wolfgang A.
Riepl Herbert
Rohrmann Jurgen
Dees Jos,e G.
Hoechst Aktiengesellschaft
Nazario Porfirio
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