Abstract A one-and two-dimensional NMR study was performed on three commercial resol phenol—formaldehyde (PF) prepolymer resins. 1 H, 13 C, CSCM and DQF COSY NMR spectral data, in acetone-d 6, were obtained on each resin and on PF model compounds: phenol, five methylolphenols, four diphenylmethanes, two formals, two dibenzyl ethers and two dibenzylamines. Gated-decoupled 13 C experiments, using 2, 4, 6-trimethylphenol as ...