Fill in the appropriate final product and name the type of pericyclic process. (a) 25 °C + Thermodynamic product – show stereochemistry Endo or Exo type of pericyclic process (b) Heat type of pericyclic process (c) Heat H. + H3CO type of pericyclic process
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- Cembrene, C20H32, is a diterpenoid hydrocarbon isolated from pine resin. Cembrene has a UV absorption at 245 nm, but dihydrocembrene (C20H34), the product of hydrogenation with 1 equivalent of H2, has no UV absorption. On exhaustive hydrogenation, 4 equivalents of H2 react, and octahydrocembrene, C20H40, is produced. On ozonolysis of cembrene, followed by treatment of the ozonide with zinc, four carbonylcontaining products are obtained: Propose a structure for cembrene that is consistent with its formation from geranylgeranyl diphosphate.Give to all parts? (a) Give the complete mechanism for the reaction of trans-2-butene with Br2 in excess H2O. (b) Name the products (including stereochemistry). (c) Give the complete mechanism for the reaction of trans-2-butene with Br2 in excess H2O. (d) Name the products (including stereochemistry).Classify each pericyclic reaction as an electrocyclic reaction,cycloaddition, or sigmatropic rearrangement. Indicate whether thestereochemistry is conrotatory, disrotatory, suprafacial, or antarafacial.
- What is the major product on photolysis of 1, 4-dimethyl-1, 3-cyclohexadiene in presence of excess oxygen, and a catalytic amount of Rose Bengal followed by reduction with H2/Pt? Show the mechanism.a) What product is formed from the [1,7] sigmatropic rearrangement of a deuterium in the following triene? (b) Does this reaction proceed in a suprafacial or antarafacial manner under thermal conditions? (c) Does this reaction proceed in a suprafacial or antarafacial manner under photochemical conditions?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.
- When 3-methyl-1-butene is reacted with 9-borabicyclo[3.3.1]nonane, the "1-ol" product is formed. What is the detailed reactin scheme for the transformation? Describe the purification procedure.Suggest a structure for the major product H of the following cycloaddition reaction between 10 and 11, and comment on any relevant stereochemical control can u show curly arrow mechanism from the basics detailed thank youThe bicyclic alkene P can be prepared by thermal electrocyclic ringclosure from cyclodecadiene Q or by photochemical electrocyclic ringclosure from cyclodecadiene R. Draw the structures of Q and R, andindicate the stereochemistry of the process by which each reactionoccurs.
- Fill in the missing reactants, reagents and products in the following reactions. Indicate stereochemistry if necessary. Unless otherwise specified, assume the reagents are in excess. PLease explaion with MUCH detail.What organic product is formed when 1‑methylcyclopentene is treated with NMMO in the presence of H2O and a catalytic amound of OsO4? Clearly show stereochemistry by drawing a wedge and dashed bond for each chiral carbon. Only draw one stereoisomer if more than one can be formed.Write out all the isomers of the compound with molecular formula C4H10O . Select the normal/ primaryisomer and treat it with conc. H2SO4 and heat. Identify the reaction and give the product ‘A’ from it. 2. When ‘A’ is treated with HBr in the presence of a peroxide, give the name and structure of the product.