This book revealed the chemistry of linear poly nuclear compounds. The "green" route for emodins synthesis is of great interest due to economic prospects, feasibility and wide range of applications in nanomedicine, catalysis medicine, nano-optoelectronics, etc. It is a new and emerging area of research in the scientific world, where day-by-day developments is noted in warranting a bright future for this field. One of the more appealing approaches in the design of linear polynuclear aromatic compounds involves the construction of anthrones, anthralines, xanthones, emodines, xanthones, bianthronyls, anthraquinones, norsolorinic acid anthrone, xanthone-crown ether, knipholone anthrone, bisanthene, 9,9'-bianthracenyl, 4,11-bisanthenequinone and 10,10'-bianthrone to another cyclic rings have attracted particular attention owing to their interested implementations.