1) For the following transformations involving one elementary step each: (i) Draw &+ and 8- on the atoms that are most electron deficient or electron rich on the starting material which will help you to draw the mechanism (ii) provide mechanism arrows to describe electron flow for these transformations (iii) name the elementary steps on blanks (not as important but useful for recognition/categorization) :CI: CN :CEN a) b) SPh Br H. : CH3 CH3 H-ö: f) Required format for multi-step mechanisms. Helps you keep track of where you are heading and saves you having to redraw product! :0: OCH3 :0: reagent(s) reaction conditions Bonds Made Bonds Broken e.g. C1-02 C4-H SM Product(s) C3-04 OCH3 so number your atoms on SM to keep track of what is happening during the reaction (=book keeping); cross out bonds made/ broken as your mechanism demonstrates each step) Intermediate # 1 g) Int. #4, etc. Int. #2 Int. #3
1) For the following transformations involving one elementary step each: (i) Draw &+ and 8- on the atoms that are most electron deficient or electron rich on the starting material which will help you to draw the mechanism (ii) provide mechanism arrows to describe electron flow for these transformations (iii) name the elementary steps on blanks (not as important but useful for recognition/categorization) :CI: CN :CEN a) b) SPh Br H. : CH3 CH3 H-ö: f) Required format for multi-step mechanisms. Helps you keep track of where you are heading and saves you having to redraw product! :0: OCH3 :0: reagent(s) reaction conditions Bonds Made Bonds Broken e.g. C1-02 C4-H SM Product(s) C3-04 OCH3 so number your atoms on SM to keep track of what is happening during the reaction (=book keeping); cross out bonds made/ broken as your mechanism demonstrates each step) Intermediate # 1 g) Int. #4, etc. Int. #2 Int. #3
Chapter30: Orbitals And Organic Chemistry: Pericyclic Reactions
Section30.SE: Something Extra
Problem 14MP: Plastic photochromic sunglasses are based on the following reversible rearrangement of a dye inside...
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