Sodium benzenesulfinateCAS NO.: 873-55-2 CAS NO.873-55-2

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Chemical Properties	white crystalline powder or crystals
Uses	Benzenesulfinic Acid Sodium Salt is used reduce the adverse chemical interaction involved in the coupling of self/dual-cured composites to hydrated dentin.
Purification Methods	Dissolve it in the minimum volume of O2 free H2O (prepared by bubbling N2 through for 2 hours) and adding O2 free EtOH (prepared as for H2O), set aside at 4o overnight under N2, filter, wash with EtOH, then Et2O and dry in vacuo. The Na salt is relatively stable to air oxidation, but is best kept under N2 in the dark. Also recrystallise it from EtOH and dry it at 120o for 4hours in a vacuum. [Kornblum & Wade J Org Chem 52 5301 1987, Beilstein 11 II 2, 11 IV 3.]