What is thethermodynamic product obtained from the addition of 1 equivalent of HBr to buta-1,3-diene? 2-Bromobut-2-ene 2-Bromobut-1-ene 1-Bromobut-2-ene 3-Bromobut-1-ene

зн Alc' 9 re -> witiple alkylation 1. Which of the following reactions would be best to perform the following reaction? ОН A) SOCI₂ then potassium tert-butoxide C) CH3 MgBr then H₂O E) KMnO4 (cold) 4. Which of the following is a conjugated diene? ? CHEM 242 Activity 2.1-Conjugated n-Systems B) H₂SO4/H₂O and heat D) PBr3 then lithium diisopropylamide (LDA)

What is the most probable elimination product when 4-chlorocyclohexene is reacted with alcoholic KOH? 1,3-cyclohexadiene 1,4-cyclohexadiene Cyclohexane Cyclohexene

Draw the two possible products formed when this diene reacts with HBr. Do not include any byproducts formed. HBr (1 equiv) Q

What stereoisomers are obtained from the following reactions? a. 1-butene + H2O + H2SO4 b. cyclohexene + HBr c. cis-3-heptene + Br2 d. trans-3-hexene + Br2

Draw the product of each electrocyclic reaction.a. the thermal electrocyclic ring closure of (2E,4Z,6Z)-nona-2,4,6-trieneb. the photochemical electrocyclic ring closure of (2E,4Z,6Z)-nona-2,4,6-trienec. the thermal electrocyclic ring opening of cis-5-ethyl-6-methylcyclohexa-1,3-diened. the photochemical electrocyclic ring opening of trans-5-ethyl-6-methylcyclohexa-1,3- diene

Choose the diene that would produce the most stable carbocation intermediate upon treatment with HBr. A A В C D D E E A D B.

In the reaction below, 3-Buten-2-one reacts with 2,3-Dimethyl-1,3-butadieneand 1,3-Butadieneat 140°C and 30°C, respectively. Explain why these two dienes react at different temperatures.

What is the major product that is formed from the 1,2-addition of HBr to the following diene? Br Br Br Br Br 8-8-8.

what are the products? please indicate the relative stereochemistry for the following transformations and indicate the major product.