H)) was characterized as its bis(2,4-DNP), mp (EtOAC-EtOH) 136-136.5°. The AB pattern of the vinylic protons in the nmr spectrum rules out the alternative regioisomer 5-methyl-5-formylcyclohex-2-ene-l-one. The latter would be expected to exhibit a multiplet for the proton on the /3-carbon.Further applications of siloxydienes to organic synthesis are currently under investigation.
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