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아세토니트릴 용매중에서 수소화붕소 나트륨에 의한 몇 가지 작용기를 갖는 유기화합물들의 환원
咸喜錫 광주보건대학 1978 論文集 Vol.4 No.-
The reduction of aliphatic and aromatic aldehydes, ketones, styrene, alcohols and carboxylic acids were examined with sodium borohydride in acetonitrile solvent. Benzaldehyde and butyraldehyde were consumed 1 equivalent of hydride for reduction without evolution of hydrogem in 1 hr. and 3 hr. Benzophenone and cyclohexanone, acetophenone, 2-heptanone and styrene were consumed. 1 equivalent of hydride for reduction without evolution of hydrogen in 24hr. 48br and 72hr. Benzoic acid and caproic acid were consumed 1 equivalernt of hydride for hydrogen evolution and 3 for reduction in 12hr. and 24hr. Ethylacetate and ethylbenzoate were reduced slightly without evolution of hydrogen. Octyl alcohol and phenol were not reduced and consumed I equivalent for evolution of hydrogen in 12hr.
咸喜錫 광주보건대학 1981 論文集 Vol.6 No.-
The representative oximes of Acetone, Acetophenone, Benzophenone, Butyraldehyde, Benzaldehyde and Cyclohexanone were reduced with Aluminum Borohydride in tetrahydrofuran at room temperature. Acetoneoxime, Butyraldoxime and Cyclohexanone oxime were reduced into amines of 68.74 and 73%, which were only Primary. Benzophenone oxime was reduced into amine of 98%, and its Composition of primary and secondary were 56 and 44%. In case of acetophenone oxime, amine was obtained 74%, and its primary and seconary amines were 93 and 7% respectively. The yield of amine from the reduction of Benzaldoxime was 73%, and the primary one of amines produced was 91%
알칼리성 수소화붕소나트륨 수용액에 의한 몇가지 벤즈알데히드유도체의 2액상환원
鄭萬泰,咸喜錫 광주보건대학 1980 論文集 Vol.5 No.-
Two phase redaction of metboxy, dimethylamino and nitro derivatives of benzaldehyde were reduced with alkaline aqueous sodium borohydride solution at room temperature. Three nitro isomers of benzaldehyde haw been rapidly to nitro-benzylalcohol within 1 hr> but p-methoxy benzaldhyde has been reduced moderately to methoxybenzylalcohol within 2hr., and p-dimethylaminobenzaldehyde has been reduced slowly to p-dimethy-laminobenylalcohol within 4hr. under the reaction condition.
양길순,류영래,한재진,함희석 광주보건대학 1981 論文集 Vol.6 No.-
To know the effect of tube voltage in X-Ray Radiography. We made an experimental study on the tube voltage, on the exposure dose in taking general examination, and obtained the results as follows. A) In the Radiographic of the Chest P-A; The experimental value of tube voltage was obtained under the control of the applied voltage, the kind of some apparatus and thickness of body. 1) The average chest Radiographic condition was resulted as 65.5Kv, 16.6 mAs in Hospital around the chonnam area 2) It was resulted 21.93cm in average Thickness of the chest, exposure dose 20mR B) The thickness was 19.22cm in the abdomen and then appeared average tube voltage was 71.6Kv, 68.2 mAs C) Estimation could not in difference with because of the working dark room uniformly to hand-operated and automatic process.
피리딘-테트라히드로푸란 용매중에서 수소화붕소 나트륨에 의한 몇 가지 작용기를 갖는 유기화합물들의 환원반응
咸喜錫 광주보건대학 1976 論文集 Vol.3 No.-
The reduction of aliphatic and aromatic alcohols, aldehydes, ketones, styrene and ca rboxylic acids were examined with sodium borohydride in 2:1 pyridine-tetrabydrofuran Octyl alcohol and. phenol were consumed 1 eguivalent of hydride for hydrogen evolution in 24 hr. and 3 br. ,and butyraldehyde, benzaldehyde, cyclohexanone, :benzophenon e, acetophenone, 2-heptanone and styrene were consumed 1 equivalent of hydride for reluction without evolution of hydrogen'. Ethylacetate and ethylbenzoate were consumed 2 equivalents. Caproic acid and benzoic acid were requirei4 equivalents ,of .hydride, 1 equivalent for hydrogen evolution and 3 for reduction.
Chae, Kyu Ho,Oh, Jae-Seong,Ham, Heui Suk Korean Society of Photoscience 1996 Journal of Photosciences Vol.3 No.3
Absorption of UV light induces photocleavage of polymer chains to produce free radicals which initiate photodegradation of the polymer molecules. Discoloration, cracking of surface, stiffening, and decreasing of mechanical properties of polymeric products occur as a result of photodegradation of the polymers. Photostabilizers are added to the polymer systems in order to minimize the unwanted effects of UV light. It is well known that Hindered Amine Light Stabilizers (HALS) are one of the most effective photostabilizer for polymers.' HALS have been used in a large number of commercial polymers and predominantly used in styrenic and engineering plastics. They are efficient and cost-effective in many applications despite their high prices. However, low molecular weight HALS vaporize easily, emitting harmful amines, and have poor extraction resistance, decreasing their photostabilization effect. They also decompose during processing and migrate within the polymers resulting in deposition on the polymer surfaces called 'blooming". These drawbacks of low molecular HALS can be overcome by use of the polymeric HALS. We have been studying photochemical reactions of the polymer systems. The present paper reports the preparation of a new polymeric photostabilizer containing HALS groups and their stabilization effects on photooxidation of polystyrene. The synthetic scheme for the preparation of polymeric photostabilizers containing HALS groups were shown at Scheme 1. N-[(Chloroformyl) phenyl]maleimide (CPMI) and N-[4-(chlorocarbonyl) phenyl]maleimide (CPMIC) were prepared by the known procedure. N[4-N'-(2,2,6,6-tetramethyl-4-piperidinyl)aminocarbonyl-phenyl] maleimide (TMPI) was prepared by the reaction of CPMI with 4-amino-2,2,6,6-tetramethylpiperidine (ATMP).