Hurd and Mold¹ have recently described the dehydration of 2-fluorenylcyclohexanol to a saturated hydrocarbon to which they attribute the structure () of 1 : 9-cyclohexylenenuorene. If this structure were correct, the result would be of considerable importance, for it would represent the first successful attempt to prepare a compound having the highly strained ring-system () which von Braun had completely failed to obtain².