NEW MATERIAL:A compound of formula I (R2 is H when R1 is CH3, and CH3 when R1 is H). USE:Useful as a synthetic intermediate for pheromones or antibiotic substances, etc. PROCESS:(1S,2S,5R)-2-Methyl-6,8-dioxabicyclo[3.2.1]octan-4-one of formula IIis reacted with triphenylphosphonium methylide to give a novel (1S,2S,5R)-2- methyl-6,8-dioxabicyclo[3.2.1]oct-4-ylidene of formula III, which is then catalytically reduced in the presence of a catalyst, e.g. platinum oxide or Raney nickel, to afford the compound of formula I .
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