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 H2 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 H2 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. LA0113419