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ring enlargement
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  扩环
     Azocarbenium ions 3, prepared in situ from 4-chromanone arylhydrazones 1, cycloadd readily to the triple bond of nitriles forming 3-spiro substituted 1,2,4-triazolium salts 4. The initial cycloadducts 4 cannot be isolated but undergo consecutive reactions, e.g. [1,2]-shifts and ensuing ring enlargement to provide 1,2,4-triazolo[3,2-d][1,5]benzoxazepine compounds 5a—5k, a kind of novel tricyclic heterocycles.
     苯并二氢吡喃 4 酮的芳腙 (1 )衍生的偶氮基碳正离子 (3)与腈发生 1 ,3 偶极环加成反应 ,加成产物 (4 )通过 [1 ,2 ] 迁移扩环重排反应 ,形成新颖的三环系杂环化合物 1 ,2 ,4 三唑并 [3,2 d][1 ,5 ] 苯并氧氮杂化合物 5a_5k .
短句来源
     Condensation of saccharin sodium with methyl chloroacetate af-forded 2,which underwent ring enlargement under drastic conditions with NaOCH_3,then N-methylation,The obtained 4 reacted with 2-aminopyridine to give pir-oxicam(1)in 31.5% overall yield.
     糖精钠与氯乙酸甲酯缩合得2,再加甲醇钠在激烈条件下扩环,经 N-甲基化,得4,再与2-氨基吡啶反应得吡罗昔康(1)。
短句来源
     7-aminodesacetoxy cephalosproanic acid (7-ADCA) is made from penicillin G via oxidation, ring enlargement rearrangement and fragmentation.
     7-氨基-3-去乙酰氧基头孢烷酸(7-ADCA)是以青霉素G为原料,经氧化、扩环重排、裂解3步反应制得。
短句来源
     If the N~+-CH_2 ylide can be generated, ring enlargement might occur. As yet no halophilic reaction has occurred.
     反应的意图是得到N~+-CH_2~-ylide,从而可能导致扩环
短句来源
     3-Methyl-decahydro~2-naphthanone and spiro (1,3-dioxocyclopentane)-2,6' -(3' -methyl -4' -ethyloxycarboxy-decahydro-2'-naphthanone) which were studied by ring enlargement reaction were synthesized. The ster.
     本文还对扩环反应所用的3—甲—十氢—2—萘酮及螺[(1,3—二氧杂环戊烷)—2,6′—(3′—甲—4′—乙氧羰基—十氢—2—萘酮)]的合成进行了考察,鉴定了后者的立体结构。
短句来源
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  “ring enlargement”译为未确定词的双语例句
     STUDY OF CONVERSION OF PENICILLIN G INTO CEFAZOLIN BY RING ENLARGEMENT
     青霉素扩环成唑啉头孢菌素的研究
短句来源
     In this thesis, ring enlargement reaction of quaternary ammoniumsalts of N-heterocycles were investigated. Dimethyl diacetyl-d,1-tartrate and the meso counterpart were synthesized and the fallacy of using chiral shift reagents to differentiate d, 1 and meso isomers was demonstrated.
     本论文对N-杂环季胺盐的反应及DL和meso二乙酰酒石酸甲酯异构体的合成及运用手性位移试剂可以对DL和Meso异构体进行区别的误解进行了研究。
短句来源
     In this thesis , a general procedure for the ring enlargement of N-heterocycles with the net result of -CH_2- insertion was improved.
     本论文在总结前人文献的基础上,提出了使部分氮杂环化合物在环内净增加一个-CH_2-基团的方法,并且将该方法成功应用于部分氮杂环化合物的合成及结构改造。
短句来源
     (3)The patients of cardiac carcinoma had an ultrasound feature of cardiac ring enlargement and thickening of cardiac wall without dilation of lower esophagus before water provocative test.
     (3)贲门癌患者饮水前表现为贲门环增大、贲门壁增厚 ,食管未扩张 ;
短句来源
     Maculopathy includes ischmic maculopathy (limited nonirrigation zone with or without macular arch ring enlargement and break) and macular edema.
     根据荧光素眼底血管造影检查分为缺血性黄斑病变 (黄斑区有局限性毛细血管闭塞的无灌注区形成 ,有或无黄斑拱环扩大或断裂 )和黄斑水肿两大类。
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  相似匹配句对
     I——RING WITH D. C. C
     满足降链条件的Ⅰ—环
短句来源
     The Ring-enlargement Reaction of Triphenylcyclopentadiene
     三苯基环戊二烯扩环反应研究
短句来源
     Its ring enlargement products showed that the reaction was regiospecifical.
     研究了并环双环酮3—甲—十氢—2—萘酮的扩环,其产物说明了该扩环区域专一性。
短句来源
     Power Ring
     幂环
短句来源
     The model of enlargement and its application
     扩大模型的充要条件及其应用
短句来源
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  ring enlargement
The title perfluoro-α-lactam (1) was found to react with N,N-dimethylformamide to give initially a betaine (2) which undergoes ring enlargement to produce the isomeric 2-dimethylamino-3,4,4-tri(perfluoroalkyl)substituted 5-oxazolidone (3).
      
The transformations taking place were cracking (hydrogenolysis), hydrogenative ring opening and ring enlargement.
      
The distribution of methylcyclopentane (MCP) ring enlargement (RE) products between benzene (Bz) and cyclohexane (CH) provides information on the reaction mechanism.
      
It is found that in the sequence M = Li, Na, K the activity for ring opening increases, while that for ring enlargement decreases and the benzene/cyclohexane ratio in the ring enlargement product increases.
      
The target hexahydro-1H-pyrido[3,2-c]azepine derivatives were obtained via ring enlargement of the corresponding hexahydroquinolines under Schmedt conditions.
      
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Condensation of saccharin sodium with methyl chloroacetate af-forded 2,which underwent ring enlargement under drastic conditions with NaOCH_3,then N-methylation,The obtained 4 reacted with 2-aminopyridine to give pir-oxicam(1)in 31.5% overall yield.

糖精钠与氯乙酸甲酯缩合得2,再加甲醇钠在激烈条件下扩环,经 N-甲基化,得4,再与2-氨基吡啶反应得吡罗昔康(1)。

Three ring-expanding products 2,3 and 4 were isolated for the first time from the lead tetraacetate oxidation products of L-2(10)-pinene . Their structures, (1S,6S)-7,7-dimethyl-bicyclo [4, 1. 1]-3-octanone, (1R,6S)-7,7-dimethylbicyclo[4. 1. 1]-2-octanone, and (4S)-4-iso-propenylheptanone, were respectively established on the basis of spectroscopic data (EI-MS,HR-MS, IR,1H-NMR,13C-NMR,H-H and C-H COSY,etc. )- Possible reaction pathways for the formation of these new compounds involving novel ring-enlargement...

Three ring-expanding products 2,3 and 4 were isolated for the first time from the lead tetraacetate oxidation products of L-2(10)-pinene . Their structures, (1S,6S)-7,7-dimethyl-bicyclo [4, 1. 1]-3-octanone, (1R,6S)-7,7-dimethylbicyclo[4. 1. 1]-2-octanone, and (4S)-4-iso-propenylheptanone, were respectively established on the basis of spectroscopic data (EI-MS,HR-MS, IR,1H-NMR,13C-NMR,H-H and C-H COSY,etc. )- Possible reaction pathways for the formation of these new compounds involving novel ring-enlargement are discussed.

在四醋酸铅氧化L-2(10)-蒎烯的产物中,首次分离得到三种扩环产物2、3、4,经HR-MS、EI-MS、NMR(~1H、~(13)C、H-H COSY、H-C COSY)、IR等波谱方法确定,分别为(1S,6S)-7,7-二甲基双环[4.1.1]-3-辛烷酮及其异构体(1R,6S)-7,7-二甲基双环[4.1.1]-2-辛烷酮和(4S)-4-异丙烯基环庚烷酮,文中还讨论了反应机理。

Reactant components and corresponding structures of lead tetraacetate-oxidation of β-pinene were investigated via High-Resolution-Mass-Spectra technique. Besides sixteen known components, nine compounds ,including recently successfully isolated three ring-enlargement ones,7,7-dimethylbicyclo [4,l,1]-3-octanone,7,7-dimethylbicyclo [4,l,l]-2-octanone and 4-isopropenyl-heptanone,were first identified in the reaction products based on spectrum data. Those three novel seven-member-ring ketones are...

Reactant components and corresponding structures of lead tetraacetate-oxidation of β-pinene were investigated via High-Resolution-Mass-Spectra technique. Besides sixteen known components, nine compounds ,including recently successfully isolated three ring-enlargement ones,7,7-dimethylbicyclo [4,l,1]-3-octanone,7,7-dimethylbicyclo [4,l,l]-2-octanone and 4-isopropenyl-heptanone,were first identified in the reaction products based on spectrum data. Those three novel seven-member-ring ketones are expected to become highly important intermediates for the preparation of antibacterial thujaplicins.

应用高分辨质谱分析技术对β-蒎烯四醋酸铅氧化反应产物进行定性研究,新近定性出反应产物中的其它9种化合物。并报道首次单离成功的3种扩环氧化产物的质谱数据和结构,即:7,7-二甲基双环[4,1,1]-3-辛烷酮,7,7-二甲基双环[4,1,1]-2-辛烷酮,4-异丙烯基环庚烷酮。这3种扩环产物均为文献未刊载过的饱和七元环酮。

 
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