Demonstrated here is the use of metal free system in a three component fluoroalkylfluoroalkylselenolation of alkenes under visible light irradiation. The method combines two photoinduced process and allows introduction of –Rf and –SeRf to alkenes.
Multi-branched polymer, process for producing the same, and applications thereof
申请人:——
公开号:US20040220346A1
公开(公告)日:2004-11-04
A group of polymers comprising a plurality of polyolefin chains and polar polymer chains and having a multi-branched structure such as a block structure, a graft structure and a star-shaped structure is produced efficiently by polymerizing or reacting a combination of various polar monomers and their polymers i.e. polar polymer chains by using a functional group-containing polyolefin as a macroinitiator, a macromonomer or a reactive polymer. The resulting multi-branched polymer has a specific shape such as a block structure, a graft structure or a star-shaped structure, and has properties of both the polyolefin and polar polymer, thus exhibiting useful performance in various uses in films and compatibilizing agents as a novel polyolefin-based polymer.
Olefin polymerization catalyst system useful for polar monomers
申请人:——
公开号:US20040260043A1
公开(公告)日:2004-12-23
This invention relates to a polymerization method comprising contacting at least one olefin monomer, at least one polar monomer, an optional activator, and a catalyst compound represented by the formula:
1
wherein M is selected from groups 3-11 of the periodic table;
2
L
1
represents a formal anionic ligand, L
2
represents a formal neutral ligand, a is an integer greater than or equal to 1; b is greater than or equal to 0; c is greater than or equal to 1,
E is nitrogen or phosphorus, Ar
0
is arene, R
1
-R
4
are, each independently, selected from hydrogen, hydrocarbyl, substituted hydrocarbyl or functional group, provided however that R
3
and R
4
do not form a naphthyl ring, N is nitrogen and O is oxygen.
Polyolefin macromonomer, graft polymer obtained from the polyolefin macromonomer, and use thereof
申请人:——
公开号:US20040242791A1
公开(公告)日:2004-12-02
A novel graft polymer useful in various uses that has a polyolefin backbone having polyolefin segments excellent in moldability can be obtained by homopolymerizing a novel polyolefin macromonomer or polymerizing the novel polyolefin macromonomer in the coexistence of other olefins depending on need, wherein the macromonomer has at the terminal of its polyolefin chain a vinyl group whose &agr;-position may be substituted, and the macromonomer can be efficiently obtained by a method, for example, successively carrying out i) a step of producing a polyolefin having a hydroxyl group at the terminal of the polyolefin chain and ii) a step of converting the terminal hydroxyl group of the polyolefin in chain into an acryloyl group, a methacryloyl group or a styryl group.
Alkyltitanium alkoxides generally serve as nucleophiles in reactions with carbonyl compounds and cross-coupling. Their application as reductants is known but remains underdeveloped. Here, we report that irradiation with visible light makes these organometallic compounds efficient reducing agents for the dehalogenation of 1,2- and 1,3-haloalcohols. This reaction was utilized for the reduction of epoxides