Structure of 2,2-bis(trifluoromethyl)-7,7-bis(trifluoromethyl)-hydroxymethyl-1,3,6-trioxaspiro [4.4]non-8-ene

The chemical structure of the unusual condensation product of hexafluoroacetone with 2-hydroxymethylfuran, namely 2,2-bis(trifluoromethyl)-7,7-bis(trifluoromethyl) hydroxymethyl-1,3,6-trioxaspira[4.4]non-8-ene, has been unequivocally established by x-ray structural analysis. The spiroannelated dihydrofuran and dioxalane heterocycles exist in flattened envelope and envelope conformations, respectively. An intramolecular unsymmetrical, bifurcated H-bond is also present.