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- 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.Order the following compounds from least reactive to most reactive with MeMgBr.Tautomerization is a process in which an enol yields a ketone Give one examplefor a keto to enol tautomerization. Which form is more stable. Also, which ismore stable the E isomer or the Z isomer of 2-Chloro, 2-Butene
- Give the detailed mechanism for the following nitration reaction. Show the contributing resonance structures and the resonance hybrid for the intermediates. HNO,, H,SO, NO2(b) How can be prepared from OEt CO,Et and at EtO OEt EtO2C 95 °C ? Provide the mechanism.In cells, vitamin C exists largely as its conjugate base X. X is anantioxidant because radicals formed in oxidation processes abstract thelabeled H atom, forming a new radical that halts oxidation. Draw thestructure of the radical formed by H abstraction, and explain why this Hatom is most easily removed.
- Resveratrol is an antioxidant found in the skin of red grapes. Itsanticancer, anti-inflammatory, and various cardiovascular effects areunder active investigation. (a) Draw all resonance structures for theradical that results from homolysis of the OH bond shown in red. (b)Explain why homolysis of this OH bond is preferred to homolysis ofeither OH bond in the other benzene ring.Arrange the compounds below in order of increasing reactivity in a SN2 reaction. 1. (CH3)2СНCI 2. CH3CH2B1 3. CH3CH2C1 A) 1; 2; 3 В) 3;B 2; 1 C) 1; 3; 2 D) 2; 1; 3 E) 3; 1; 2TReferences] Indicate, by letter(s), the position(s) on the ring at which substitution occurs when the aromatic compounds shown undergo bromination with Br, FeBr3 (when necessary). .H CN HO
- What carbon radical is formed by homolysis of the C–Ha bond inpropylbenzene? Draw all reasonable resonance structures for thisradical.Predict the the regiochemical outcome (major product) for each of the following reaction, and explain why. (Draw complete resonance structures.) CN ÇO,Et EtO MeoIdentify the electrophile and the nucleophile in each of the following reaction steps and then draw curved arrows to illustrate the bond-making and bondbreaking processes.