9. (a) With the help of orbital correlation diagram predict the conditions of 4+2r system. (b) Using PMO approach, discuss the reaction conditions for 4x electrocyclic reaction. (c) What are 1,3-dipolar cycloaddition reactions? Give examples. 10. Predict the product under the given reaction conditions and propose mechanism. C (b) A OMe O OMe OMe A in Decane
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- (2) Draw Suve the to products specify 1)BH 3 2) HzOz, H2O, оно of the sterco chemistry 1) Hg (0AC)₂, H₂0 2) Na BH4 H+ 1 H ₂0 H₂, Rancy Ni below, making where applicable. reactionsIdentify the pericyclic reactions in the followingreaction schemes. Give the complete reactionname and indicate the course of the reaction withthe aid of the arrow notation.(a) For the reaction of 1-methoxy-4-methylbenzene with CH3C(O)CI in the presence of AICI3, describe the bonding and electron distribution in 1-methoxy- 4-methylbenzene, formation and structure of the electrophile in the reaction, and the most stable intermediate responsible for the end product. i H3C1 CI, AICI 3 Me- -OMe 1-methoxy-4-methylbenzene (b) Use phenol as the substrate, propose a synthetic scheme to produce 2-allyl-4-bromophenol (Mechanism not required). Br OH OH phenol 2-allyl-4-bromophenol (c) Propose a synthesis of Compound A starting from benzaldehyde and other necessary reagents of your choice (Mechanism not required). OH CHO CI. Compound A benzaldehyde (d) For the given 13C NMR chemical shifts of the carbonyl carbons in the order of ketones > aldehydes > carboxylic acids, provide an explanation. O CH3 H3C. 13C NMR Chemical Shifts: H₂C1 H₂C H > OH 200 ppm 181 ppm 209 ppm
- 1. а) Consider the reaction scheme below. PhLi HONH,, HCI A C ELOH B D (ii) Outline the mechanism for the conversion of A to B.a) Consider the reaction scheme below. -[•] PhLi HONH,, HCI A ELOH B D (i) Deduce the structures of compounds A, D and intermediate C. (ii) Outline the mechanism for the conversion of A to B.One possible way of determining the identity of an alkene, is to let itundergo an oxidative cleavage reaction in the presence of hot basicpotassium permanganate. You are given two containers said to containdifferent alkenes. Container A is marked as cis / trans‐2‐butene andcontainer B as 2‐methyl‐1‐butene. Explain by referring to the formation ofproducts, how you would verify the identity of the alkenes.
- Hydrocarbon 10 and ester 12 react upon heating to give a cycloaddition product D. (i) Suggest a structure for product D and provide a curved arrow mechanism that accounts for its formation. (ii) Draw the molecular orbitals corresponding to the HOMO of 10 and the LUMO of 12 and show that these are of suitable symmetry for a concerted cycloaddition to take place. (iii) Use frontier molecular orbital theory to account for the observation that the formation of D is faster in the presence of AlCl3. please answer all thank you(iii) Explain the products in the following addition reactions with mechanism. CH i) Hg(OAC)2 , H,0 CH3 i) BH3,THF CH3 HO ii) NaBH4, MEOH ii) H,O, /NAOH OHIdentify the pericyclic reactions in the followingreaction schemes. Give the complete reaction name and indicate the course of the reaction with the aid of the arrow notation.
- The Diels-Alder reaction is not the only pericyclic reaction involving the cyclic flow of six electrons over six atoms. Other examples include electrocyclic reactions, Cope rearrangements, and Claisen rearrangements, the (a) ? Нeat Electrocyclic reaction curved arrow notations for which are shown here. Complete each of these reactions by drawing the product. (b) Cope rearrangement Нeat (c) Claisen rearrangement Нeatgive reactions and intima mechanism of following reactions-(b). Identify the products D, E and F from the reactions (i) - (iii) below, considering the su stereochemistry of the products where relevant (curved arrow mechanisms are not required). denato Mesopot odosla s Na, NH3 (1), -78 °C (i) tBuOH Pemen (ii) MeO on the anoisibuoo bris 2 (iii) NC. bald of thegion etengo que Me nama O luofle Me Ste sit to zigno Catalyst 8 (1 mol %) BH3, THF 152001912 BO D S260204071 (0) engno sdt malaze OMO E bis 29521 8 Ph O N-B 30 12 Met grindle D stalno obuloni Na, NH3 (1), -78 °C then work-up N. Me 576 8 T ben llat ng A cirlo vinat: Carosiq or O primyeth C-C, sishqonge sbuloni ozla obrode woY (quong and souborto Ph Me gg79 (d) (beripar en el 500 madi vivo ♬ jud qoz ross 10) in