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

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 CH3CH20 Na* CH3CH2OH Br C6H5 Draw the E2 elimination product of the reaction. Take into account that the starting stereochemistry affects the resulting double bond stereochemistry. • 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.

Treatment of the following stereoisomer of 1-bromo-1,2-diphenylpropane with sodium ethoxide in ethanol gives a single stereoisomer of 1,2-diphenylpropene. I H C6H5 H3C Br C6H5 CH3CH2O Na+ CH3CH2OH Draw the E2 elimination product of the reaction. Take into account that the starting stereochemistry affects the resulting double bond stereochemistry. • 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.

jpg, jpeg, png files only! 7 Provide a short answer for why the secondary alkyl halide is the major product versus the tertiary alkyl halide from free radical halogention H₂C HJ NBS peroxides H₂C Br H₂C Br= + enantiomer + enantiomer Major Minor Delete K

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

7) Which of the following compounds is the most reactive dienophile in a Diels-Alder reaction with 1,3-butadiene? A) CH2-CHOCH3 B)CH2 CHCHO C) CH3CH-CHCH3 D) (CH3)2C-CH2 E) CH2-CH2 Haiiawi, A

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)

Major product ?

Select the best reagents for the reaction below. O 1. OsO4; 2. NaHSO3, H₂O O 1. Hg(OAc)2, H₂O; 2. NaBH4 O 1. RCO3H; 2. H3O+ O H₂SO4, HO O 1. 03: 2. DMS OH OH + enantiomer

Identify the best reagents to convert 1-hexyne into 2-bromo-1-hexene. O xs Br2, CCl4 1 equiv HBr, ROOR xs HBr O 1 equiv HBr O 1 equiv. Br2, CCl4