41. Acetyl iodide reacts with acetate salts or acetic acid to give the anhydride . 42. Where desired, this compound may be dried by addition of trifluoroacetic anhydride . 43. Acyl chlorides or acid anhydrides react with hydrogen fluoride to give acyl fluorides. 44. The reaction is unusual in that the anhydride reacts with the aromatic ring. 45. Styrene maleic anhydride copolymer is formed, retaining the aromaticity of the styrene. 46. They are used to prepare mixed carboxylic acid anhydrides used in peptide synthesis. 47. These include aliphatic and cycloaliphatic amines, polyaminoamides, amides, and anhydrides . 48. Their technology currently produces BDO / THF from maleic anhydride , a petrochemical. 49. Base anhydrides are not Br�nsted Lowry bases because they are not proton acceptors. 50. Acetic anhydride is used industrially for preparing acetate esters.
