300‐MHz ¹H‐NMR spectra of p‐cresol‐formaldehyde condensates having regular repeating structures

Abstract

Model p‐cresol‐formaldehyde condensates having regular sequences of methylene ether and methylene linkages were prepared by the self‐condensation of dimethylol derivatives of p‐cresol‐formaldehyde condensates (2‐hydroxy‐5‐methyl‐1,3‐benzenedimethanol, 3,3′‐methylene‐bis[2‐hydroxy‐5‐methylbenzenemethanol] and 3,3′‐[(2‐hydroxy‐5‐methyl‐m‐phenylene)dimethylene]‐bis[2‐hydroxy‐5‐methylbenzenemethanol]). 300‐MHz 1H‐NMR spectra of these polymers and of their acylated derivatives were recorded and used to develop resonance assignments for the various types of protons present in these polymers. The spectra were found to be sensitive to end‐group and sequence distribution effects.

<title>Studies of dissolution inhibition mechanism of DNQ-novolak resist (II): effect of extended ortho-ortho bond in novolak</title>

“…(2-1) Synthesis of Precursors and Novolaks p-Cresol trimer and its bishydroxymethylolated derivative were prepared according to previous literature (7)(8)(9).…”