%0 Conference Proceedings %T Polyvinyl alcohol immobilized N-ethylsulfamicacid(PVA-NHSO3H): Mild and Efficient Catalyst for Acetylation of Phenols, Alcohols and Amines under Solvent-Free Conditions %A Razavi Fard, Mehri %A Akhlaghinia, Batool %A , %J 17th Iranian Chemistry Congress %D 2014