Selective step‐growth phenol‐aldehyde polymerization, 1. Synthesis, characterization and X‐ray analysis of linear all‐ortho oligonuclear phenolic compounds

Abstract

The series of dinuclear to nonanuclear all-ortho methylene-bridged oligophenols 2 -9 has been synthesized according to a repetitive reaction sequence involving the C-ortho regiospecific condensation of appropriate phenoxymagnesium precursors with salicyl alcohol or paraformaldehyde. IR, UV, mass, 'H and I3C NMR characteristics of these oligomers are discussed. X-ray crystal structures of 2, 3, and 4 are also reported.

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

“…The film coated on the Si wafer was exposed to g-line Hg radiation using a FPA-1550 M-III stepper (NA=0.48), followed by 60 sec puddle development with FHD-5, a TMAH-based developer (0.26 N). hydroxy (OH) groups (12). Based on this understanding, a molecular structure of novolak was designed to construct such a hydrophilic domain similar to p-cresoi trimer.…”

Polymers Based on Phenols

“…23 . A series of exclusively ortho-ortho linked low molecular weight Novolac resins derived from phenol and formaldehyde 24,25 , acetaldehyde 26,27 and isobutyraldehyde 28 has also been synthesized.…”

Inclusion of HNEt3+in an acyclic tetraphenolate

“…Full characterization of the organic extractants, including determination of their conformation in the solid state, is important for the understanding of extraction processes. If there are now numerous examples of crystal structures of calix [4]arenes reported in the literature, those of their acyclic homologues are less common (Casiraghi et al, 1982;Paulus & Bo È hmer, 1984;Usui et al, 1991). All these reports concern the fully protonated ligands.…”

“…The conformation of (I) in the solid state can be described as syn±anti (Casiraghi et al, 1982;Perrin & Oehler, 1990). Consequently, three of its aromatic faces are organized into a partial cone.…”