Furan, 2,5-dimethyltetrahydro

Figure 2. Synthetic schemes and NMR data for model compounds. Key A, 2,6-dimethyltetrahydropyran-3,4-dicarboxylic acid and B, 2,5-dimethyltetrahydro-furan-3,4-dicarboxylic acid.

Acetaldehyde and propionaldehyde made up at least 90% of the C-C oxygenates for all experiments. The Cg oxygenates include 2,5-dimethyltetrahydrofuran, 2,4-dimethyltetrahydro-furan, 2,2,4-trimethyloxepane (not shown), and small amounts of other species (not shown) such as 3-ethoxy-l-butene and hexanal. The major product was 2,5-dimethyltetrahydrofuran, optimized at 21% selectivity for CgH,4/02 2.5, after which it did not change substantially. Its 2,4-constitutional isomer showed a similar trend but was minor in comparison (maximum -4% selectivity). Selectivity to Cg oxygenated hydrocarbons exceeded 30% for CgHj4/02 = 2.25 to... 

Mizutani Y, Abe T, Ikeda K (1997), Graphite intercalation compounds prepared in solution of alkali metals in 2-methyletra hydrofuran and 2,5-dimethyltetrahydro-furan , Garbon, 35(1), 61-65. 

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