Me(3)SnNHPh and (n-Bu(3)Sn)(2)NPh are shown to be excellent stannylating reagents for -OH and -SH functional groups present in coal materials. The latter reagent is not as prone to exchange phenomena as the former; however, thus facilitating resolution of Sn-119 NMR peaks at 240 K for model mixtures derivatized with (n-Bu(3)Sn)(2)NPh, Because of self-association of derivatized compounds in noncoordinating solvents such as hexane, Sn-119 NMR spectra are best measured in pyridine, wherein this phenomenon is quenched by solvent coordination. A model mixture of four phenols and a similar mixture of five thiophenols in pyridine derivatized with (n-Bu(3)Sn)(2)NPh showed well-resolved Sn-119 NMR peaks whose calculated integrations reflected the original amounts of phenols added within +/-1.7%. Sn-119 NMR spectra at 240 K of 29 phenols, thiophenols, carboxylic acids, and alcohols derivatized with (n-Bu(3)Sn)(2)NPh in pyridine reveal that the Sn-119 chemical shift ranges of these compound classes do not overlap. Preliminary results on a pyridine extract and a low-temperature pyrolysate of an Illinois No. 6 coal sample derivatized with (n-Bu(3)Sn)(2)NPh indicate detectable amounts of phenols, of which four were tentatively identified in the condensate.