Abstract: End-capped polymers, methods for making those end-capped polymers and compositions containing those end-capped polymers are disclosed. One of the disclosed end-capped copolymers has the formula: and may be combined with demineralized bone particles to form a tissue repair composition.

Abstract: End-capped polymers, methods for making those end-capped polymers, compositions containing those end-capped polymers, and methods for using those compositions are disclosed. One of the disclosed end-capped copolymers has the formula (I): and may be combined with natural or synthetic bone minerals, bone tissue, collagen tissue, bone protein or combinations or derivatives of those materials to form a tissue repair composition.

Abstract: A novel family of olefin polymerization catalysts comprising three-membered titanacarbocycles is described and illustrated. The titanacarbocycles can be readily synthesized by utilizing di-n-butyltitanium dichloride or di-t-butyltitanium dichloride at −78° C. in alkane, cycloalkane, or aromatic hydrocarbon media. These catalysts exhibit sufficient stability after their preparation that they undergo a remarkable, unprecedented reaction whereby the titanium dichloride moiety is efficiently transferred to a substrate like diphenylacetylene, ethylene, or similar compounds in order to generate the three-membered titanacarbocycles.

Abstract: End-capped polymers, methods for making those end-capped polymers, compositions containing those end-capped polymers, and methods for using those compositions are disclosed.

Abstract: End-capped polymers, methods for making those end-capped polymers and compositions containing those end-capped polymers are disclosed.

Abstract: A metallocene corresponding to the formula wherein M is a group 4 transition metal, each Y is, independently, selected from the group of halogen, hydrocarbyl and hydrocarbyloxy, R1, R4 are, independently, selected from the group of hydrogen, hydrocarbyl, hydrocarbyloxy, R2, R3, R5, R6, R7, R8 are, independently, selected from the group of hydrogen, hydrocarbyl, hydrocarbyloxy, with the provision that, respectively, R2 and R3, R5 and R6, R7 and R8 can be linked to each other.

Abstract: A metallocene corresponding to the formula ##STR1## wherein M is a group 4 transition metal, each Y is, independently, selected from the group of halogen, hydrocarbyl and hydrocarbyloxy,R.sup.1, R.sup.4 are, independently, selected from the group of hydrogen, hydrocarbyl, hydrocarbyloxy,R.sup.2, R.sup.3, R.sup.5, R.sup.6, R.sup.7, R.sup.8 are, independently, selected from the group of hydrogen, hydrocarbyl, hydrocarbyloxy, with the provision that, respectively, R.sup.2 and R.sup.3, R.sup.5 and R.sup.6, R.sup.7 and R.sup.8 can be linked to each other.A process for the preparation of metallocenes comprising the following steps:(a) contacting, in a solvent, a transition metal halide of formula MX.sub.4 with an organometallic compound of formula M'R.sub.

Abstract: Novel bimetallic organometallic compounds, their synthesis and application in polymerization catalyst system based on combination of such novel bimetallic organometallic compounds with transition metal complexes is provided.

Abstract: Metal is photolytically deposited from solution onto a substrate in contact with the solution by irradiating with light a solution containing a solubilized metal source and an organic compound containing a plurality of proximal Lewis base substituent groups so as to be capable of promoting the photoreduction of the metal onto the substrate.

Abstract: Metal is photolytically deposited from solution onto a substrate in contact with the solution by irradiating with light a solution containing a solubilized metal and a tetraarylborate compound capable of promoting the photoreduction of the metal onto the substrate.

Abstract: Ketones are alkylenated to form the corresponding olefin by reaction with a bis(substituted alumino)substituted methane, e.g., in the form of its dietherate.