Thiocarbonylthio compound and free radical polymerization...

Details Thiocarbonylthio compound and free radical polymerization... Thiocarbonylthio compound and free radical polymerization...

2011-06-28

2011-06-28

Kosack, Joseph (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Esters having the thiocarboxylate group, -cx-, wherein the...

C526S225000

Reexamination Certificate

active

07968743

ABSTRACT:
A thiocarbonylthio compound and free radical polymerization employing the same. The thiocarbonylthio compound is represented by formula (I) or (II):wherein Z can be independently perfluoroalkyl, alkyl, haloalkyl, aryl, alkylaryl, haloalkylaryl, arylalkyl, aminoalkyl, alkylamino, alkoxy, alkoxyaryl, alkylsulfonyl, alkylsulfonylaryl, dialkylphosphinyl, or dialkylphosphinothioyl; R1and R2can be each independently hydrogen, alkyl, aryl, alkylaryl, arylalkyl, aminoalkyl, alkylamino, alkoxy or alkoxyaryl; R3is alkyl, aryl, aminoalkyl, alkylamino, alkoxy or alkoxyaryl. Furthermore, R3can also be alkyl, aryl, alkylaryl, arylalkyl, aminoalkyl, alkylamino, alkoxy, haloalkylaryl, alkylsilyl, alkylthio, alkylthioaryl, or substituent containing CN, CO, COOH, COOCH3or heterocyclic moieties; and R4is perfluoroalkyl. The thiocarbonylthio compound can be used as a reversible chain transfer agent in a free radical polymerization to obtain a polymer with a controlled molecular weight and narrow polydispersity.

REFERENCES:
Lim et al. “Sulfur-Containing Compounds FromScorodocarpus borneensisand Their Antimicrobial Activity” Phytochemistry, 1998, vol. 48, No. 5, pp. 787-790.
Delduc et al. “A Convenient Source of Alkyl and Acyl Radicals” J. Chem. Soc., Chem. Commun. 1988, pp. 308-310.
Bertrand et al. “A Xanthate Transfer Radical Process for the Introduction of the Trifluoromethyl Group” Organic Letters, 2001, vol. 3, No. 7, pp. 1069-1071.

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