Homo- and co-condensate prepolymers, obtained along with the most typical components of oil-shale alkylresorcinols (5-methylresorcinol, 2,5-dimethylresorcinol), have been characterized using H-1 NMR spectroscopy. Methylene H-1 chemical shift assignments are discussed considering solvent effects and structural characteristics of hydroxyl- and methyl-effects arising from resorcinolic and phenolic co-reagents.