Which of the shown reagents is needed to accomplish the shown reaction ? OCH3 NaOCH3 ??? DMF ´CH3 CI Br OH O-Tos ´CH3 ´CH3 ´CH3 ´CH3 A Either of A or B will work O1. O 3. A 4 D
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- Determine the mechanism of nucleophilic substitution of each reaction and draw the products, including stereochemistry. CH₂CH3 a. b. C. x Br + CN Br H Br + OCH3 + CH3OH CH₂CH₂CH3 acetone DMSO d. CI + CH3 e. f. H Br CH3COOH + -OCH₂CH3 + CH3CH₂OH DMFProvide the reagents. Но + enantiomer A 1. KOt-Bu, heat 2. mCPBA 3. MeMgBr 4. H2O B. 1. conc. H,SO4, heat 2. MCPBA 3. MeBr С. 1. РBгз 2. KOt-Bu 3. mCPBA 4. MeMgBr 5. H2O D. 1. Br2, hv 2. KOt-Bu 3. mCPBA 4. MeMgBr 5. H2O E. 1. Br2, hv 2. KOt-Bu 3. MCPBA 4. MeBr 5. H2O F. 1. Br2, FeBr3 2. KOt-Bu 3. mCPBA 4. MeMgBr 5. H2O G. 1. Br2, FeBr3 2. KOt-Bu 3. mCPBA 4. MeBr 5. H20Draw the products of each SN1 reaction and indicate the stereochemistry when necessary. CH3CH₂ CH3 a. Br-C Br b. CH3 CH3 CH3CH₂ CI + H₂O + CH3OH C. d. Br + + CH3CH₂OH H₂O
- What is the missing reagent in the reaction below? of of. cr CI Multiple Choice O LIAIH4. [2] H2O (1] CH2=CHLI, [2] H2O (1]) (CH2=CH)2CULİ, (2) H20 (1] DIBAL-H, (2] H20c. Which reacts faster in an Sy1 reaction? CH3 CH3 CH;CHCHCH3 or CH;CH,CCH3 1. Br Br d. Which reacts faster in an E2 reaction? Br Br orAlthough a Wittig reagent can be prepared from 5-bromo-1,3-cyclopentadiene in the usual way, that Wittig reagent is unreactive toward ketones or aldehydes. Br 1. P(CGH5)3 R' ? No reaction 2. Bu –Li (a) Draw the complete mechanism showing the formation of the Wittig reagent. (b) Explain why that Wittig reagent does not undergo nucleophilic addition with ketones or aldehydes. O=U
- What is the product of the illustrated mechanism? A A B B C C D D HAC H₂C A H- ,CH 3 O: H3C. CH3 ? H3C H3C. , CH 3 H3C. H3COH ధర్మం , వ O: HAC H3C P CH3 H B D CH3Decide on the mechanism for each substitution, and then pick the solvent that affords the faster reaction. a.(CH3CH2)2CClCH3 + CH3OH in CH3OH or DMSO b.CH3CH2CH2Br + −OH in H2O or c. DMF (CH3CH2)2CHCl + CH3O− in CH3OH or HMPAWhich organometallic reagent will add to an enone through a 1,4-addition? O A. CIMGCH(CH3)2 В. 3. LICH3 O C. BRCH2CH3 O D: LiCu(CH2CH3)2
- The correct reagent for the following transformation is. . CH3 H3C ??? H- Select one: BH3 then H202/OH O H2/Pd cat. O BH3 ONLY O H20/H* H2/Lindlar's cat.Draw the products of each reaction. (1] CH;MgBr CH3 [1] (CH,=CH)2CULII a. b. [2] H20 [2] H2ODraw the products of each reaction. [1] SOCI2 [2] (CH3CH2),NH (excess) SOCIl, a. b. он CH3CH2 HO