4b ;3',diisothiazole-1-carbonitrile (27). A solution of tetraethylammonium cyanide (1.7 g, 0.01 mol) in acetonitrile (50 mL) was added over a 15-min period to a solution of 26 (3.3 g, 0.01 mol) in acetonitrile (100 mL) at 15 °C, and crude 27 (2.21 g, 98%) was isolated by filtration. Compound 27 was washed with acetonitrile and ether. Recrystallization from n-butyl chloride (or acetone) gave analytically pure 28:

No abstract

No abstract

distilled in a Kugelrohr apparatus at 140-145 °C (0.02 torr) to afford GLC-pure product (6.85 g) as a yellow liquid: 38% yield as 7;

Trimethylsilyl cyanide (1) and N-(trimethylsilyl)diphenylmethyleneamine (2) reacted with α-aryl-N-phenyl-nitrones to afford the corresponding 1: 1 adducts 4 and 5 respectively. Thermal decomposition of 4 in refluxing xylene gave azoxybenzene, stereoisomers of 2,3-diarylsuccinonitriles, α-iminonitriles and/or benzanilides, whose yields depended on the nature of substituents on phenyl group of 4. On heating in benzene 5 afforded a mixture of azoxybenzene and meso-N,N′-bis(diphenylmethylene)-1,2-diarylethylenediamines. On the other hand, reactions of 1 and 2 with N-(diphenylmethylene)aniline N-oxide or N-(9-fluorenylidene)aniline N-oxide did not give the corresponding 1: 1 adducts, but instead compounds arising from thermal decomposition of initial 1: 1 adducts were directly obtained. The reaction of 1 with N-(p-diethylaminophenyl)-α-phenylnitrone leading to the corresponding α-imino nitrile is also described.

Starting from a finite OED in the Johnson-Baker-Willey formulation, structures of uv divergences of (OlSlO) in QED arc analysed. To obtain the finite QED in the vacuum region several eigenvalue conditions for the bare electron charge are introduced.

We report, using an electron spectrometer equipped with both monochromatized Al Kα and unmonochromatized Mg Kα sources, the quantitative characterization of the surface content, hydrolysis ratio, and condensation degree of polyalkoxysiloxane segregated to the surface of a polyurethane crosslinked film consisting of acryl polyol, polyisocyanate, and polyalkoxysiloxane. Unmonochromatized Mg Kα X‐ray irradiation extremely accelerated the decomposition of alkoxy groups of polyalkoxysiloxane. The surface content and hydrolysis ratio were determined from C 1s, Si 2p, and N 1s spectral intensities measured with monochromatized Al Kα X rays after decomposition by unmonochromatized Mg Kα X‐ray irradiation. The condensation degree was determined by the kinetic energy of the silicon KLL Auger electron after decomposition. We applied the established characterization method for a polyurethane film containing polyalkoxysiloxane. After 20 days, the surface content of polyalkoxysiloxane was greater than 60 wt %, the hydrolysis ratio ranged from 0.8 to 0.95, and the higher hydrolysis ratio resulted in a larger condensation degree. The hydrophilicity of the film surface became higher as the surface content and hydrolysis ratio increased, and the crack density became higher as the condensation degree increased. A method for characterizing the practical properties of coating film surfaces containing polyalkoxysiloxane was established. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 2917–2926, 2002

No abstract