16.42 please I dont understand A and if you could show the
resonance as well. thanks...
16.41 The absorbance spectrum of 1,3-butadiene displays an absorp- tion in the UV region (Amax=217 nm), while the absorption spectrum of 1,2-butadiene does not display a similar absorption. Explain. 16.42 Predict the products for each of the following Diels-Alder reactions: O HOOO COOHD Hoocan MeO ON 16.43 Identify the reagents you would use to prepare each of the following compounds via a Diels-Alder reaction COOH ACN (а) сооны см COOH + En g) COOH 16.44 The following triene reacts with excess maleic anhydride to produce a compound with the molecular formula C14H120 Draw the structure of this product ignoring stereochemistry) Maleic anhydride - CHO.