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- Draw the product formed when diene M undergoes disrotatory cyclization. Indicate the stereochemistry at new sp3 hybridized carbons. Will the reaction occur under thermal or photochemical conditions?For the following dienes, predict the product and draw the full arrow pushing mechanism. Label each product as thermodynamic or kinetDraw the product formed when diene M undergoes disrotatorycyclization. Indicate the stereochemistry at new sp3 hybridized carbons.Will the reaction occur under thermal or photochemical conditions
- Which of the following are correct? Correct any false statements. a. A conjugated diene with an even number of double bonds undergoes conrotatory ring closure under thermal conditions. b. A conjugated diene with an antisymmetric HOMO undergoes conrotatory ring closure under thermal conditions. c. A conjugated diene with an odd number of double bonds has a symmetric HOMO.Is the following alkene E,Z, or neither? a. E b. Z c. neither d. It is one or the other, but which is impossible to determine from the information givenWhen 1,2-dimethylcyclopentene undergoes hydroboration–oxidation, one diastereomerof the product predominates. Show why this addition is stereospecific, and predict thestereochemistry of the major product.
- Please identify priorities of functional groups and name following molecules based on thier stereochemistry as R or SElimination occurs when (Z)-3-bromohex-3-ene is treated with NaNH2. Under the same conditions, 1-bromocyclohexeneundergoes elimination much more sluggishly. Explain whyShow the curved-arrow mechanism for the first step, and the structure of the cyclic intermediate formed, when cyclopentene in treated with KMnO4 . A Lewis structure for the permanganate ion is provided in the hint. Make sure to show all non‑bonding electron pairs and formal charges where necessary. Omit K+ .
- (a) A compound known to be a substituted cyclohexanone derivative has lamda max of 235 nm. Could this compound be a conjugated dienone? explain (b) (i)For this compound, how many nm must be accounted for by substituents? (ii) What are the substituents and the points of substitution that may occur having accounted for the 20nm?Pyridine exhibits a UV transition of the type n at 270 nm. In this transition, one of the unshared electrons on nitrogen is promoted from a nonbonding MO to a (antibonding) MO. What is the effect on this UV peak if pyridine is protonated?Assign R or S configuartion to the following molecules.