Give the products for the following reactions; propose a mechanism to explain the formation of each. In d, f and h an alkyne is used as the dienophile. Can you elucidate those products based on your knowledge? 20 (a) (1) ن (0) OMe OMe (b) ۲۰- 203 (e) .203.201... (h) + گا COOH + - 201 COOH (c) OH (f) + imam NC-=-CN كما

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