Acetylated poly

We have developed a novel silicone-based positive photoresist (SPP) for two-layer resist systems. SPP is composed of an acetylated poly(phenylsilsesquioxane)... 

Acetylated poly(phenylsilsesquioxane) characterization, 176-177 molecular structure determination, 176 29Si-NMR spectra, 176,178/ synthesis, 176... 

A number of 3-(alditol-l-yl)-5-methyl-7-oxo-l,2,4-triazolo[4,3-a]pyrim-idines l,2,4-triazolo[4,3-a]pyrimidines acyclo C-nucleosides (30) were synthesized (95PHA784) by oxidative cyclization of the corresponding aldehydo-sugar pyrimidin-2-ylhydrazones 27 with bromine in water. The alternative structure 29 was eliminated based on finding that acetylation of 30 afforded the same acetylated acyclo C-nucleosides 31 as those obtained by oxidative cyclization of the (A3-acetyl-poly-0-acetyl)hydrazones 28. Compounds 31 were also obtained by one-pot oxidative cyclization and acetylation of 27. In contrast to the oxidation and concurrent bromination of 19 to 25, it was possible to avoid nuclear bromination of 27 and 28 by performing the reaction in the absence of light (Scheme 13). 

A clear-cut molecular relay system is materialized with the combination of two nucleophile moieties such as hydroxamic acid and imidazole introduced in a polymer (38, 40, 82). Hydroxamate anion has a high nucleophilicity but deacylation of the acylhydroxamate is very slow. The significance of the deacylation step in the hydrolysis in polymer catalyst is pointed out in several works, for example, the deacylation of acetylated poly(4(5)-vinylimidazole) (83,84) and the aminolysis of nitrophenyl ester of poly(styrene-co-acrylic acid) (85—87). To promote the deacylation velosity of the acylated hydroxamic acid imidazole moiety is introduced in the hydroxamic acid-containing polymer. The polymers are shown in tire following page. 

The inherent viscosity values have been compared with end group determinations of the acetate end groups of completely acetylated poly-n-butyralde-hyde. For this purpose, the intensity of the carbonyl band of the acetate end groups (5.72 p) was determined by infrared and was related to an internal standard giving what we call the end group ratio (15.72 4.75 ) The end... 

USE As intensifter in photography as brominating agent in organic Synthesis as humidity indicator as wood preservative in solid-electrolyte battery as stabilizer for acetylated poly Formaldehyde. 

Fig. 4.4. Hating curvK of the ineU-cryslallized poly(oxymetfaylene), acetylated poly(trioxaae), annealed for 10 min at various tempoatures under a nitrogen atmo here Heating rate, 16 °C/min A, original B, annealed at 165 °C (T. - 5.5) C. annealed at 168 °C (T, - 2.5) D, annealed at 171 "C (T, + 0.5)...

Fig. 4.13a- . Small-angle X-ray scattering patterns of the melt-OTstallized poly(oxymethylene), the acetylated poly(trioxane) a original (melt-crystallized) and annealed, b at 156 °C fw 30 min c 165 °C, 20min d 168 °C, 20min e sample d annealed at 172 °C for 10min. Intensities are not comparable...

Fig. 5.5. Relationship between the ratio (S/So,tg) of the area per w unit weight under the endothermic peak of the irradiated (S) to the unirradiated (S ,) and dose (D) O, poly(trioxanc) O, Delrin A, Takafest, acetylated poly(trioxane)... 

Fig. 32. Increase in pressure in the oxidation of acetylated poly-formaldehyde (1), in the presence of 0 polyamide (2), 1.2fyo polyamide and 0.8% triacetoneazotoxide (3), and in the oxidation of delrin (4). T = 200 C, Pq = 600 mm Hg. ...

YA Oya, S., Heat of solution of synthetic high polymers. 111. Heat of solution of partially acetylated poly(vinyl alcohol), Chem. High Polym. Japan, 12, 122, 1955. 

It could therefore be deduced that under gastric and saliva conditions the hydrolysis of the polymeric plasticiser, acetylated poly( 1,2-propylene adipate) was insignificant. 

A new Sia analogue, 9-O-acetyl-KDN, and a2,8-linked 6>-acetylated poly-(Neu5Ac) chains, were described in a PSGP from the unfertilized eggs of the Kokanee salmon (Table I Iwasaki et al., 1990). These poly(Neu5Gc) chains... 

Iwasaki, M., Inoue, S., and Troy, F. A., 1990, A new sialic acid analogue, 9-0-acetyl-deaminated neuraminic acid, and a-2,8-linked 0-acetylated poly(N-glycolylneuraminyl) chains in a novel polysialoglycoprotein from salmon eggs, J. Biol. Chem. 265 2596-2602. 

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