Bis- hydroxymethyl -2,2-bifuran

The C NMR spectrum displays five instead of ten carbon signals as expected from the empirical formula C107//0O4. To conclude, two identical halves C5//5O2 build up the molecular structure. 

All carbon signals and resolved couplings can be assigned C-6 is more deshielded (5c = 150.0) than C-7 (5c = 146.5) due to electron withdrawal of the carboxy carbonyl group in para position. 

The carbon signal at 5c = 133.4 splits into a sextet with Jqh = 6 Hz. This carbon of the 

---