- Please Answer Questions A And B 1 (168.83 KiB) Viewed 28 times
please answer questions a and b
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please answer questions a and b
please answer questions a and b
Аавьсср АавьсcDa АавbC Аавьссс Аав A === I Normal 1 No Spac... Heading 1 Heading 2 Title Paragraph Is Styles 1. 2.1 3.1 4 51. 6.1.7.1. 8. 1.9.1.10 1 11 . 1 . 12 1 13 114 115 1 This question relates to the theoretical investigation in thermal stability of the different possible linkages in the hydrocarbon polymer poly(a-methylstyrene) C (PAMS) as described in Zhu et al., ChemistryOpen, 2018, 7, 463 – 466. C (PAMS) In the table below the dissociation energies are given for the bonds in bold of the a- methylstyrene (AMS) dimers D, E and F below. Note: these dimers are model compounds for head-to-tail (H-T), head-to-head (H-H) and tail-to-tail (T-T) linkages in PAMS. Dimer structure D m F Bond dissociation energy (kJ/mol) (bond in bold) 405 461 330 a) Show how each the linkages H-T, H-H and T-T is formed during the polymerization of AMS using mechanistic diagrams and deduce which model compound (D, E, or F) relates to each linkage (i.e., H-T, H-H and T-T) observed in PAMS. b) Building upon your assignments from (a), explain the predicted values for the bond dissociation energies for the bonds in bold for the model compounds D, E and F. In your answer make sure to provide reaction mechanisms and comment on the relative stability of the radical species formed during homolysis. B
Аавьсср АавьсcDa АавbC Аавьссс Аав A === I Normal 1 No Spac... Heading 1 Heading 2 Title Paragraph Is Styles 1. 2.1 3.1 4 51. 6.1.7.1. 8. 1.9.1.10 1 11 . 1 . 12 1 13 114 115 1 This question relates to the theoretical investigation in thermal stability of the different possible linkages in the hydrocarbon polymer poly(a-methylstyrene) C (PAMS) as described in Zhu et al., ChemistryOpen, 2018, 7, 463 – 466. C (PAMS) In the table below the dissociation energies are given for the bonds in bold of the a- methylstyrene (AMS) dimers D, E and F below. Note: these dimers are model compounds for head-to-tail (H-T), head-to-head (H-H) and tail-to-tail (T-T) linkages in PAMS. Dimer structure D m F Bond dissociation energy (kJ/mol) (bond in bold) 405 461 330 a) Show how each the linkages H-T, H-H and T-T is formed during the polymerization of AMS using mechanistic diagrams and deduce which model compound (D, E, or F) relates to each linkage (i.e., H-T, H-H and T-T) observed in PAMS. b) Building upon your assignments from (a), explain the predicted values for the bond dissociation energies for the bonds in bold for the model compounds D, E and F. In your answer make sure to provide reaction mechanisms and comment on the relative stability of the radical species formed during homolysis. B
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