Scheme 3. Synthesis of M-1 (E = C; M = Li, Na or K), M-2 (E = Si; M = Li, Na or K) and M-3 (E = Ge; M = Li, Na or K). Conditions: (i) AlCl3/AcCl; (ii) HOCH2CH2OMe/NEt3; MR = Bu t Li, PhCH2Na or PhCH2K; MOBu t (M = Li, Na or K).
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