2c key - Question 1(6 marks a 4-Pyrone(below is protonated...

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2 Question 1 (6 marks) a) 4-Pyrone (below) is protonated by acid to give a stable cationic product. Propose a structure for this product and explain why it is relatively stable. O O H + b) Draw the product of the reaction in (ii). (i) (ii) c) Why does reaction (ii) proceed but not reaction (i)? OH H + no reaction H + faster reaction OH
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3 Question 2 (7 marks) Write the reagents required to perform the following transformations in the boxes below. There may be more than one reaction in each box. Where necessary, separate these with reaction numbers 1,2, etc. Pay attention to the direction of the reaction arrows! a) OH H O H O OH Cl O O b) Cl O O O O O O O O CH 3 CH 3
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4 Question 3 (8 marks) a) Label the following reactions by writing ( A ) reduction ( B ) oxidation or ( C ) neither above the
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