FIELD: organic chemistry. SUBSTANCE: product: simple diethers of the general formula 
where R1 and R2 are similar or different and represent branched C1-C6-alkyls or C5-C6-cycloalkyls. These simple diethers can be used for preparing of catalysts Cigler-Natt. Reagent 1: diol of the formula 
where R1 and R2 have meanings indicated above. Reagent is subjected for methylation with halidemethyl. EFFECT: improved method of synthesis. 3 cl, 1 tbl
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