Organic tellurium compound, process for producing the same, living radical polymerization initiator, process for producing polymer with the same, and polymer
AssigneeOtsuka Chemical Co., Ltd.
InventorsShigeru Yamago, Junichi Yoshida
Life of this patent
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Abstract
An organotellurium compound of the formula (1) is useful as a living radical polymerization initiator and makes possible precision control of molecular weights and molecular weight distributions under mild conditions wherein R1 is C1-C8 alkyl, R2 and R3 are each a hydrogen atom or C1-C8 alkyl, and R4 is aryl, substituted aryl, aromatic heterocyclic group, hydroxycarbonyl or cyano.
Claims7
An organotellurium compound represented by the formula (1)
- wherein R1 is C1-C8 alkyl, R2 and R3 are each a hydrogen atom or C1-C8 alkyl, and R4 is aryl, substituted aryl, aromatic heterocyclic group, hydroxycarbonyl or cyano, provided that R2 and R3 are not simultaneously a hydrogen atom.
A process for preparing an organotellurium compound of the formula (1) comprising reacting a compound of the formula (2), a compound of the formula (3) and metallic tellurium
- wherein R1 is C1-C8 alkyl, R2 and R3 are each a hydrogen atom or C1-C8 alkyl, and R4 is aryl, substituted aryl, aromatic heterocyclic group, hydroxycarbonyl or cyano, provided that R2 and R3 are not simultaneously a hydrogen atom
- wherein R2, R3 and R4 are as defined above, and X is a halogen atom
- M(R1)m (3)
- wherein R1 is as defined above, M is an alkali metal, alkaline earth metal or copper atom, and m is 1 when M is an alkali metal, m is 2 when M is an alkaline earth metal, or m is 1 or 2 when M is a copper atom.
A living radical polymerization initiator of the formula (4)
- wherein R5 is C1-C8 alkyl, aryl, substituted aryl or aromatic heterocyclic group, R2 and R3 are each a hydrogen atom or C1-C8 alkyl, and R4 is aryl, substituted aryl, aromatic heterocyclic group, hydroxycarbonyl or cyano, provided that R2 and R3 are not simultaneously a hydrogen atom.
A process for producing a living radical polymer comprising polymerizing a vinyl monomer with use of a compound of the formula (4) as a living radical polymerization initiator,
- wherein R5 is C1-C8 alkyl, aryl, substituted aryl or aromatic heterocyclic group, R2 and R3 are each a hydrogen atom or C1-C8 alkyl and R4 is aryl, substituted aryl, aromatic heterocyclic group, hydroxycarbonyl or cyano, provided that R2 and R3 are not simultaneously a hydrogen atom.
Dependencies are inferred from the claim text.