59780-98-2Relevant academic research and scientific papers
Acid-amplifier having acetal group and photoresist composition including the same
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Page/Page column 8, (2009/02/10)
An acid-amplifier having an acetal group and a photoresist composition including the same, are disclosed. The acid-amplifier produces an acid (second acid) during a post-exposure-bake (PEB), which is induced by an acid (first acid) generated from a photo-acid generator (PAG) at the exposure process so that a line edge roughness (LER) of the photoresist pattern and photoresist energy sensitivity are improved. The acid-amplifier has a structure of following Formula 1. in Formula 1, R is C4~C20 mono-cyclic or multi-cyclic saturated hydrocarbon, R1 is C1～C10 linear hydrocarbon, C1~C10 perfluoro compound or C5~C20 aromatic compound, Ra and Rb are independently hydrogen atom or C1~C4 saturated hydrocarbon and A is independently oxygen atom (O) or sulfur atom (S).
Stereoselective azide introduction during 1,2-sulfur migration in α-hydroxyalkyldithioacetals
Afonso, Carlos A. M.,Barros, M. Teresa,Maycock, Christopher D.
, p. 801 - 814 (2007/10/03)
A series α-hydroxyalkyldithiolanes were reacted with a mixture of triphenylphosphine, diethyl azodicarboxylate and hydrazoic acid to give 2-azido-l,4-dithianes stereoselectively. Reduction of the azido group to an amine resulted in racemisation.
The substrate- and stereoselectivity of microbial reductions of 1,4-dithiaspirodecanones and 1,5-dithiaspiroundecanones
Takemura, Tetsuo,Hosoya, Yoshiko,Mori, Nobuo
, p. 523 - 529 (2007/10/02)
The title spirocyclic ketones, possessing possible substitution patterns 1,4-dithiaspirodecan-6-one (1a), -7-one (3a), and -8-one (5a) and 1,5-dithiaspiroundecan-7-one (2a), -8-one (4a), and -9-one (6a), have been reduced with new strains of yeast (Saccharomyces cerevisiae, JCM 1819 and JCM 2214).Reductions of the prochiral ketones 1a-4a occur with high enantiofacial selectivity on the preparative scale (up to 99percent ee).The product alcohols (1,4-dithiaspirodecan-6-ol (1b) and -7-ol (3b) and 1,5-dithiaspiroundecan-7-ol (2b) and -8-ol (4b)) have theS configuration, as confirmed by 2D COSY experiments of the (S)-MTPA ester of 1b-4b using the configuration correlation model of Mosher.
STEREOCHEMICAL INVESTIGATIONS. XXXVI. CONFORMATIONAL CHARACTERISTICS OF CYCLIC THIOKETALS OF 2-SUBSTITUTED CYCLOHEXANONES
Mursakulov, I. G.,Kasumov, N. K.,Ramazanov, E. A.,Movla-zade, S. A.,Samoshin, V. V.,Zefirov, N. S.
, p. 1321 - 1328 (2007/10/02)
The conformational equilibria in the cyclic thioketals of 2-substituted cyclohexanones were investigated by means of the averaged width of the signal for the methine proton in the PMR spectra.The dependence of the conformational characteristics on the structure of the thioketal group is interpreted in terms of steric and dipole-dipole interactions.
