P Question concerns organic radical chemistry. please attempt question.
Posted: Fri Apr 29, 2022 1:01 pm
P
Question concerns organic radical chemistry. please attempt question.
AaBbCcDd AaBbCcDd AaBbC( AaBbCcc Aab Normal 1 No Spac... Heading 1 Heading 2 Title === 1- 1.1 1.2.1.3 5 161 7 8 1 9. 1 Paragraph Styles 10 11 | 12 | 13 | 14 | 15 | Below the scheme, a pseudo-first order kinetics plot of monomer conversion vs time using each RAFT agent is given. S S(CH2)11CH3 ett S S(CH2)11CH3 NEC H Hori AIBN, 1,4-dioxane 60 °C S(CH2)11 CH3 G (NVC) PNVC 1 2.5 "S(CH2),CH3 2.0 NEC H 1.5 (Twiw] S(CH2).CH 1.0 0.5 0.0- 2 4 6 8 10 12 14 16 time (h) a) Give the structures of the reinitiating radicals derived from H and I. Discuss aspects of their stability/reactivity (including points on sterics and electronics) and their "philicity". b) From the kinetics plot it is clear that while the cyanomethyl RAFT agent H displays pseudo-first order kinetics the phenylethyl RAFT agent I do not. Instead, I displays a significant inhibition period due to slow reinitiation of polymerization following chain transfer. c) Based on this observation, and building on your answer from (a), explain why this is the case. In your answer make sure to use reaction mechanisms where required to clearly illustrate your points. .
- P Question Concerns Organic Radical Chemistry Please Attempt Question 1 (166.71 KiB) Viewed 24 times
AaBbCcDd AaBbCcDd AaBbC( AaBbCcc Aab Normal 1 No Spac... Heading 1 Heading 2 Title === 1- 1.1 1.2.1.3 5 161 7 8 1 9. 1 Paragraph Styles 10 11 | 12 | 13 | 14 | 15 | Below the scheme, a pseudo-first order kinetics plot of monomer conversion vs time using each RAFT agent is given. S S(CH2)11CH3 ett S S(CH2)11CH3 NEC H Hori AIBN, 1,4-dioxane 60 °C S(CH2)11 CH3 G (NVC) PNVC 1 2.5 "S(CH2),CH3 2.0 NEC H 1.5 (Twiw] S(CH2).CH 1.0 0.5 0.0- 2 4 6 8 10 12 14 16 time (h) a) Give the structures of the reinitiating radicals derived from H and I. Discuss aspects of their stability/reactivity (including points on sterics and electronics) and their "philicity". b) From the kinetics plot it is clear that while the cyanomethyl RAFT agent H displays pseudo-first order kinetics the phenylethyl RAFT agent I do not. Instead, I displays a significant inhibition period due to slow reinitiation of polymerization following chain transfer. c) Based on this observation, and building on your answer from (a), explain why this is the case. In your answer make sure to use reaction mechanisms where required to clearly illustrate your points. .