- Heteroatom bridged metallocene compounds for olefin polymerization
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This invention relates to a transition metal compound represented by the formula: wherein M is a group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom; E is: 1) a substituted or unsubstituted indenyl ligand that is bonded to Y through the four, five, six or seven position of the indenyl ring, or 2) a substituted or unsubstituted heteroindenyl ligand that is bonded to Y through the four, five or six position of the heteroindenyl ring, provided that the bonding position is not the same as the position of the ring heteroatom, or 3) a substituted or unsubstituted fluorenyl ligand that is bonded to Y through the one, two, three, four, five, six, seven or eight position of the fluorenyl ring, or 4) a substituted or unsubstituted heterofluorenyl ligand that is bonded to Y through the one, two, three, four, five or six position of the heteroindenyl ring, provided that the bonding position is not the same as the position of the ring heteroatom; A is a substituted or unsubstituted cyclopentadienyl ligand, a substituted or unsubstituted heterocyclopentadienyl ligand, a substituted or unsubstituted indenyl ligand, a substituted or unsubstituted heteroindenyl ligand, a substituted or unsubstituted fluorenyl ligand, a substituted or unsubstituted heterofluorenyl ligand, or other mono-anionic ligand; Y is a Group 15 or 16 bridging heteroatom substituent that is bonded via the heteroatom to E and A; and X are, independently, univalent anionic ligands, or both X are joined and bound to the metal atom to form a metallocycle ring, or both X join to form a chelating ligand, a diene ligand, or an alkylidene ligand. This invention further relates to catalyst systems comprising the above transiotioon metal compounds, activators and optional supports and their use to polymerize or oligomerize olefins.
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- Synthesis of new C3h and C3v truxene derivatives
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Palladium-catalyzed cross coupling of 2,7,12-tribromotruxene with organostannanes and boronic acids leads to 2,7,12-trisubstituted truxenes. 5,10,15-Tdarylated and trialkynylated truxene derivatives are obtained by the reaction of truxenone with aryl Grignard reagents or an alkynyllithium, followed by reduction of the tertiary alcohols with Et3SiH or BF3. syn-5,10,15-Triarylated derivatives were obtained by the base-catalyzed isomerization of the anti derivatives.
- Go?mez-Lor, Berta,De Frutos, O?scar,Ceballos, Pla?cido A.,Granier, Thierry,Echavarren, Antonio M.
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p. 2107 - 2114
(2007/10/03)
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- 1-arylsulphonyl, arylcarbonyl and arylthiocarbonyl pyridazino derivatives and methods of preparation
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1-Arylsulphonyl, arylcarbonyl and arylthiocarbonyl pyridazino derivatives and processes for making said derivatives are described. The novel derivatives are non-steroidal heterocyclic compounds which act as selective progestins and/or antiprogestins having a high in-vitro affinity for either the uterine, breast or bone progestin receptor. As such, the non-steroidal heterocyclic derivatives are useful in contraception, menopause, osteoporosis or endometriosis.
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- A convenient synthesis of mono- and polyhalogenated benzocyclanones
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Benzocyclanones were mono- or dihalogenated on the aromatic ring with elemental halogen or N-halosuccinimide without solvent in an aluminum chloride slurry in good yield. This process is the most direct method for the synthesis of 5- or 7-halo, or 5,7-dihalotetralones and can be extended to indan-1-ones and benzocycloheptan-1-ones as well as to trihalogenated and to mixed halogenated products.
- Cornelius,Combs
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p. 2777 - 2788
(2007/10/02)
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