ESSENTIALLY DISCONNECTED FULLY-ACENOIDS, AND FULLY-ARENOID HYDROCARBONS

The class of fully-arenoid hydrocarbons is defined so that it includes the well known fully-benzenoids. A fully-arenoid B has a ''full'' sys tem consisting of Kekulean benzenoids (arenes) which cover completely all the vertices of B. Important subclasses emerge when the arenes of the full system are catacondensed or, in particular, are linear acenes with a hexagons each. These fully-[a]acenes may be essentially discon nected. A precise definition is given of fully-[a]acenes of class C. T he number of nonisomorphic systems of this category are given in terms of a general mathematical solution.