Thumbs Throckmorton, a graduate student in his twelfth year of study, has designed the synthetic procedures shown in Fig. P19.63. Indicate the problems (if any) that each synthesis is likely to encounter.

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(a) (b) H₂C -C || -CH Ph3P+(CH3)3CCH₂Br Figure P19.63 EtMgBr ether H3O+ CH3(CH₂) 3Li OH fol -CH Et H3C-C- Ph–CH=0 PhCH=CHC(CH3)3