The rate constants for the reaction of three peroxy radicals with OH have been measured using different precursors. Peroxy radicals have been prepared by either the reaction of Cl-atoms with C2H6, C3H8 and n-C4H10 or through photolysis of the corresponding alkyliodide. Using Cl-atoms, the following rate constants have been measured: C2H5O2 + OH -> products k(1) = (1.3 +/- 0.3) x 10(10) cm(3) s(-1) C3H7O2 + OH -> products k(2) = (1.4 +/- 0.3) x 10(10) cm(3) s(-1) C4H9O2 + OH -> products k(3) = (1.5 +/- 0.3) x 10(10) cm(3) s(-1) Experiments using 248 nm photolysis of the corresponding alkyliodides as precursor enhances the rate constants by a factor of two, bringing up the suspicion of a fast reaction between I-atoms and OH radicals. (C) 2017 Elsevier B.V. All rights reserved.