The thermal properties of 2-naphthalenethiol, C10H7SH, dosed on Ag(111) at 150 K have been studied by temperature-programmed desorption (TPD) using time-of-flight mass spectrometry and Auger electron spectroscopy (AES). For low doses, no C10H7SH is observed in TPD, S-H bonds break below 235 K to form 2-naphthyl thiolate, C10H7S(a), and H-(a), the latter desorbing as H-2 below 300 K. For higher doses, dissociation is accompanied by C10H7SH desorption in a single unsaturable peak at 235 K. Reflecting the stability of the thiolate, there is negligible desorption between 300 and 500 K. Over a broad temperature range, 500-850 K, products desorb that couple C10H7 and C10H7S with H, with C10H7, or with C10H7S, but no H-2 desorbs. Some products involve forming additional rings. At 850 K, the highest temperature probed, only H2S is desorbing. After TPD, AES detects a multilayer comprised of C and S with a C/S ratio of 3.1. A mechanism accounting for the products is presented.