Sodium methoxide 2% w/w in methanol is used in the preparation of high-spin hexanuclear Mn(III) cluster, [NaMn₆ (OMe)₁₂ (dbm)₆]⁺. It is useful in the synthesis of pharmaceuticals and agrochemicals. It serves as an initiator of anionic addition polymerization with ethylene oxide, forming a polyether with high molecular weight.

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