In prior work [1, 2] we have described properties of fluorenone polyesters and preparation of mouldings, films, and fibres, therefrom. Fluorenone polyesters are made from isophthalic acid or terephthalic acid/isophthalic acid and bisphenol fluorenone and they have many outstanding characteristics, especially heat resistance. A wide range of polyesters can be made by varying the ratio of acids (terephthalic and isophthalic) and biLsphenols (bisphenol fluorenone and bisphenol A) and by regulating the molecular weight. Fluorenone polyesters rich in bisphenol A content will have good mouldability, whereas polyesters containing large amounts of bisphenol fluorenone have marginal mouldability. An acetylene terminated bifunctional monomer of fluorenone can plasticize fluorenone polyesters at moderately elevated temperatures and can react at high temperatures to form an improved thermally stable crosslinked network. Over the past several years, Arnold and coworkers have synthesized a family of new polymers derived from acetylene terminated monomers, e.g. acetylene terminated sulfones (ATS)and acetylene terminated quinoxalene (ATQ) [3, 4]. These are known to exhibit high thermal stability, good adhesion characteristics, and high moisture resistance. Usmani and co-workers believe that the prospects of acetylene terminated polymers are good in the future [5]. This being the case, we synthesized acetylene terminated fluorenone (ATF). ATF was prepared by the reaction route shown at the top of the next column, p-fluorophenyl acetylene (6.00 g) was added to 9,9-bis(4-hydroxyphenyl)fluorene (8.50g) in dimethylsulfoxide (230 ml) containing 25.8 g of potassium carbonate. The reaction was carried out under an inert atmosphere at 130°C for 4 days. The progress of the reaction was followed by infrared spectroscopy (monitoring acetylene band at 3300cm-1). The