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- Please help with the following ochem mechanisms.... 1. Provide the stepwise mechanisms for the following reactions (see attached picture)Why do you suppose ketone halogenations in acidic media are referred to as being acid-catalyzed, whereas halogenations in basic media are base-promoted? In other words, why is a full equivalent of base required for halogenation?Draw the neutral organic starting material. The Hint: The reaction conditions support electrophilic addition of Br2 to an alkene's C=C double bond, which would normally yield a dibromo product. However, the product has only one bromine atom, with a C–O bond on the adjacent carbon. This fragment is diagnostic for a halohydrin, where an oxygen nucleophile (water or alcohol) reacts with a bromonium intermediate to generate the O–CH2CH2–Br motif. Work backwards to determine what the starting material must look like. There should be an alcohol and an alkene in the neutral organic starting material.
- Which rearrangement product will form preferentially during the [1,2]-rearrangementof an R-group? Motivate.please provide a curved arrow mechansim for the following reaction. i know it is a Michael Mechanism, but I dont see how the tolSH is deprotonated?In Image 4 predict the effect the substituent attached to the benzene ring would have on electrophilic aromatic substitution reactions? a.ortho/para director, deactivator b.ortho/para director, activator c.meta director, activator d.meta director, deactivator
- Alkyl diazonium salts (shown below) are considered "super" leaving groups; a consequence of this is that they tend to be contact explosives What quailities make alkyl diazonium salts such excellent leaving groups?Please provide 3 possible mechanisms for bromination of trans-cinnamic acid and pyridinium tribromide (Br2) with stereochemistry (wedge and dash bond) (1 for anti addition, 1 for syn addition, and 1 for 50:50 syn and anti additon).The anticoagulant Warfarin can be synthesized by a conjugate addition (Michael addition) reaction as shown below: a) Propose a mechanism for the reaction starting from the enolate shown below. You can assume water is present for any proton transfers needed.b) We saw that the keto tautomer is normally preferred over the enol tautomer, however, the enol tautomer is present in the final product (Warfarin) and that is the more stable tautomer in this case. Why do you think the enol tautomer is more stable? Hint: consider the molecule as a whole.
- Draw the structure of the reduction products of the reaction of benzil with (drawing the mechanism may help) NaBD4, in CH3CH2OH and H2O NaBH3 in CH3CH2OD and H2O NaBH4 in CH3CH2OH and D2OAn SN2 mechanism's top requirement from an aprotic solvent is to ensure that it can stabilize the leaving group.Provide the mechansim using curved arrows of the reaction of p-t-butyl phenol treated with acetic anhydride in AlCl3. Include resonance stabilized intermediates and if more than one product is formed, label them as major, minor, etc. thank you for the help