Question

4. Provide the starting materials needed to prepare the following compounds: (a) CH3CH2CH=C-C-H CH3 CH3 (b) CECHC-CH3 | CHỊ Ạ.

Answer 1

1 & 4 a) Product a seems to be formed by aldol. Condensation So, starting material Propanal , CH₂ CH, CH CH, CH, &H + CH, CH & H Naan CH CH CH = C - 2 - 4 H + CH INAOH 2) A CH₂CH₂CH=9 СА y Product b also formed by aldol condensation do, e tasting materi Acetone , CH, C-CH; CH, & - CH + CH - Ch, dass C =CH-C-CP cJ Product c also formed by aldel, condensation do, starting material A ce top henone , Ph-C- CH C = Chen shenone Ph-C- CH₂ 0 11 NaOH Ph. Ph-C-CH₂ + Ph-c-CH₂ 2 CHE

d) Product d cross aldol deens to be do, starting a product material formed from -2-one CH₂O [ 1 ) CH = CH & CH, HE Dochy 4-(4- Me the Xy pheryl ) - 3-buten-2-one, P-methoxybenzaldehyde Cho CH=CH_&_ck + Hét och 1) NaOH 2) A CHO CH=CH & -CH=CH Toch
part a ,b and c are aldol condensation so the starting material are underlined and drawn ,but part d is a cross aldol reaction so it required two starting material also underlined and structure drawn , Since aldol condensation occurs in presence of NaOH followed by heat so reaction of products formation also given.