Chiefari, John published the artcileThiocarbonylthio Compounds (S:C(Z)S-R) in Free Radical Polymerization with Reversible Addition-Fragmentation Chain Transfer (RAFT Polymerization). Effect of the Activating Group Z, SDS of cas: 3052-61-7, the publication is Macromolecules (2003), 36(7), 2273-2283, database is CAplus.
Free-radical polymerization in the presence of suitable addition-fragmentation chain transfer agents [S:C(Z)S-R] (RAFT agents) possess the characteristics of a living polymerization (i.e., polymer products can be reactivated for chain extension and/or block synthesis, mol. weights are predetermined by RAFT agent concentration and conversion, narrow polydispersities are possible). Styrene polymerizations (110 °C, thermal initiation) were performed for two series of RAFT agents [S:C(Z)S-CH2Ph and S:C(Z)S-C(Me)2CN]. The chain transfer coefficients decrease in the series where Z is Ph > SCH2Ph ∼ SMe ∼ Me ∼ N-pyrrolo ≫ OC6F5 > N-lactam > OC6H5 > O(alkyl) ≫ N(alkyl)2 (only the first five in this series provide narrow polydispersity polystyrene (< 1.2) in batch polymerization). More generally, chain transfer coefficients decrease in the series dithiobenzoates > trithiocarbonates ∼ dithioalkanoates > dithiocarbonates (xanthates) > dithiocarbamates. However, electron-withdrawing substituents on Z can enhance the activity of RAFT agents to modify the above order. Thus, substituents that render the oxygen or nitrogen lone pair less available for delocalization with the C:S can substantially enhance the effectiveness of xanthates or dithiocarbamates, resp. The trend in relative effectiveness of the RAFT agents is rationalized in terms of interaction of Z with the C:S double bond to activate or deactivate that group toward free radical addition MO calculations and the estimated LUMO energies of the RAFT agents can be used in a qual. manner to predict the effect of the Z substituent on the activity of RAFT agents.
Macromolecules published new progress about 3052-61-7. 3052-61-7 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Amide, name is Benzyl diethylcarbamodithioate, and the molecular formula is C12H17NS2, SDS of cas: 3052-61-7.
Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics