Comments on Organic Chemistry II: Free-Radical Polymerization: Alkoxyamine Initiator...

"Alkoxyamines are used in ATRP (atom transfer radi...

2009-01-14T12:06:00.000-05:00

"Alkoxyamines are used in ATRP (atom transfer radical polymerization)-based polymerizations and can serve as efficient regulators in the preparation of polymers."
This is wrong. Alkoxyamines are used in NMP (Nitroxide-Mediated Polymerization) and not in ATRP. The precursor you are using (the bromo-functionalized molecule) is a species used in ATRP as an initiator.
The two mechanisms are different. NMP is based on a thermal equilibrium between alkoxyamines on one hand and free nitroxides and free radicals on the other side. ATRP is based on a redox equilibrium mediated by a transition metal complex (for example CuX/bipyridine) able to cleave the C-X bond.

Full marks. This was a very ambitious choice of re...

2005-08-19T13:21:00.000-04:00

Full marks. This was a very ambitious choice of reaction based on the chemistry we covered so far but I think you finally have detailed the key points. Just make sure to fix that the name you gave was for Me6TREN, not TREN.

The article you cite has the correct name of the p...

2005-08-19T06:58:00.000-04:00

The article you cite has the correct name of the polyamine. Read it carefully and think about what you are writing.

1) Make sure to include the parentheses at the rig...

2005-08-18T18:29:00.000-04:00

1) Make sure to include the parentheses at the right places for the name of Me6-TREN. Just like in math, without parentheses it doesn't make sense.
2) The Me6-TREN is a polyamine. What do you think it complexes with?

1) What is the role of alkoxyamines for polymers?2...

2005-08-17T10:23:00.000-04:00

1) What is the role of alkoxyamines for polymers?
2) Where did you get the point you make that Me6-tren forms a complex?
3) Define all abbreviations like tren