Which one of the following compounds give 5 with followed by water? What would b

Question

Which one of the following compounds give 5 with followed by water? What would be product of the following reaction? Predict the product of the following reaction sequence A) I B) II C) III D) IV E) V Provide the reactants necessary to prepare the following using the Wittig reaction. A) ethanal and 2-bromopropane B) propanal and 2-bromopenlane C) 2-pentanone and 2-bromopentane D) 2- and 2-pentanone E) butanal and 2-bromopropane Provide the structure of the ylide needed to prepare 3-ethyl-3-heptene from 3-pentanone using a Wittig reaction. A) Ph_3 P = CH (CH_2 CH_3)_2 B) Ph3 P = CHCH2CH3 C) Ph3P = CHCH 2 CH 2 CH 3 D) Ph_3 P = CH_2 E) Ph3 P = CHCH 2 (CH3)2 Provide the structure of the reactant in the following reaction. A) Cyclohexanone B) cyclohexanecarbaldehyde C) cyclohexylpropanone D) 3-cyclohexylpropanal

Explanation / Answer

15) A, 7 membered parent chain with keto group at 3 and methyl at 5 is needed

16)A, aldehyde upon reduction gives. Primary alcohol

17)C, ketone with CN- will give cyanohydrin which upon reduction give the amine with an OH group

18) C, only these two react to form the given compound

19)C, In the main chain 7 c atoms are there. Out of 7 , 3 comes from ketone. Therefore the ylide should contain 4 carbon

20)B,

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