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- Plastic photochromic sunglasses are based on the following reversible rearrangement of a dye inside the lenses that occurs when the lenses are exposed to sunlight. The original dye absorbs UV light but not visible light and is thus colorless, while the rearrangement product absorbs visible light and is thus darkened. (a) Show the mechanism of the rearrangement. (b) Why does the rearrangement product absorb at a longer wavelength (visible light) than the original dye (UV)?The key step in a reported laboratory synthesis of sativene, a hydrocarbon isolated from the mold Helminthosporium sativum, involves the following base treatment of a keto tosylate. What kind of reaction is occurring? How would you complete the synthesis?Melamine, used as a fire retardant and a component of the writing surface of white boards, can be prepared from s-trichlorotriazine through a series of SNAr reactions with ammonia. The first substitution takes place rapidly at room temperature. The second substitution takes place near 100 °C, and the third substitution requires even higher temperature and pressure. Provide an explanation fatr this reactivity.
- ! ( plz ans with proper explanation , aslo give mechanismWhich g the foellowing Strategis ayld yıcld an est« ?. 9 Nuckophilic qcyl Substitutiun q an acid Chluride with an alcoho) b) Reactwn y a O Nucleophilic acyl substitu tion of an J All of the abuve Carbuxylıc aud and an alcohel with Catayhe Sulfuriè acıd anhydale. with methand) Which nitrogen atfom B the p strongest by se ( Cirak A, B, or c)? Awrite the magor producb formed by the to llow ung eaction, Assume that You have enough of each rea Reactant to dvive the veaction bo Completion. Assume bhet thore i's protic wek up alone as neee ssary agont/ cl
- H OTS Naten DMSO Crive the mechanism and include Stereochemistry when athe appropriate. HoLout line a synthesis tor geherating Compand ma as the excusive using Compounds Fan 6. LDA or as your Selečtish ofbases major priduct You may ust only Number es sential Steps as requiree trans farmation the Componnd(b) Draw the major product. OH conc. H₂SO4 heat ?
- 19. Mechanism cat. TSOH H. CH;OHpredic tthe products for the following reactionWe your anver on paper and submit a picture here gir emaitto me ty the end of pe time for he exam CHOH CH.OH CHOH HA Provide a step-wise mechanism for the following equation, show intermediates and arrows for exchange of electrons.
