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

Draw the product that could be formed when 2,3- dimethylbuta-1,3-diene reacts with (E)-2-butenedinitrile. Include any relative stereochemistry. CN NC

what product would you expect from the SN1 reaction of (S)-3-methyloctan-3-ol[(S)-3-hydroxy-3-methyloctane] with HBr? Show the stereochemistry of both starting materail and product.

Elimination reactions of cis-and trans-1-bromo-2-methylcyclohexanes with NaOEt in E1OH can give the same or different main product, 1-methylcyclohexene (1) or 3-methylcyclohexene (2). Which of (a)-(d) indicates the main products? Br Br NaOEt NaOEt ELOH ELOH Me `Me Me Me cis 1 2 trans A. 1 both from the cis and trans substrate B. 2 both from the cis and trans substrates C. 1 from the cis and 2 from the trans substrate D. 2 from the cis and 1 from the trans substrate

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

Draw the major 1,2- and 1,4-addition products formed when this diene reacts with HBr. Do not include any byproducts formed. HBr (1 equiv) o

Treatment of the following stereoisomer of 1-bromo-1,2- diphenylpropane with sodium ethoxide in ethanol gives a single stereoisomer of 1,2-diphenylpropene. H3C H C6H5 H C6H5 Br ***I CH3CH₂O Na+ Draw the E2 elimination product of the reaction. Take into account that the starting stereochemistry affects the resulting double bond stereochemistry. CH₂CH₂OH Consider E/Z stereochemistry of alkenes. Do not show stereochemistry in other cases. • You do not have to explicitly draw H atoms. • In cases where there is more than one answer, just draw one. Sn [F ?

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.