adding water 10 ml to alumina 50 g brockman grade i 200 mesh aldrich chemical company ______________________________________physical properties of the sulfone cyclic oligomersexample yield sup a mn sup b mw sup b tg u00b0 c sup c tga u00b0 c sup d______________________________________21 100 1 500 3 500 190 500 22 sup f 100 1 600 2 400 230 520______________________________________ isolated yield measured by gpc and calibrated against polystyrene measured on dsc under nitrogen atmosphere 50 ml min and heating rate was 20 u00b0 c min reported for 5 weight loss under nitrogen atmosphere 200 ml min and heating rate was 20 u00b0 c min the starting material has mn 1 400 mw 1 800 cyclic aryl ether phthalazine oligomers can be synthesized from the corresponding diketone cyclics by reaction with hydrazine cyclic oligomer 3 16 g was refluxed with 50 ml of chloroform for 30 min then the solution was allowed to stand at room temp for 2 h at this time the cyclic monomer n 1 precipitated out and was removed by suction filtration evaporation of the filtrate gave the desired oligomer mixture 6 5 g containing 8 w w of cyclic monomer to a solution of cyclic oligomer 3 2 g in dioxane 20 ml was added hydrazine hydrate 2 ml and conc hcl acid 0 6 ml the resulting solution was refluxed for 3 h a green solid precipitated out during the reflux the solid was filtered redissolved in acetic acid 20 ml followed by sodium nitrite 3 g to remove any hydrazone formed the solution was refluxed until no more nitrogen dioxide was evolved the solution was coagulated in water 20 ml and filtered redissolved.