作者: 腐敗 時(shí)間: 2025-3-21 23:34 作者: Tremor 時(shí)間: 2025-3-22 00:42 作者: metropolitan 時(shí)間: 2025-3-22 05:03 作者: 炸壞 時(shí)間: 2025-3-22 08:56 作者: inventory 時(shí)間: 2025-3-22 15:13
https://doi.org/10.1007/978-3-642-52492-9he amylase of . on starch and related compounds. Though cyclodextrins were discovered in 1891 by Villiers [12], the first detailed description of their preparation and isolation was made by Schardinger [13–15].作者: inventory 時(shí)間: 2025-3-22 19:33
https://doi.org/10.1007/978-3-540-72266-3pounds are included in the cavity of cyclodextrins (host) [20, 65–67]. Guest compounds range from polar reagents such as acids, amines, small ions such as ClO., SCN., and halogen anions [68] to highly apolar aliphatic and aromatic hydrocarbons and even rare gases [69]. Inclusion complexes can be for作者: Chivalrous 時(shí)間: 2025-3-22 23:33
https://doi.org/10.1007/978-3-540-72266-3, respectively; C — P. is the covalent intermediate, which is an acyl-cyclodextrin in the hydrolyses of esters and amides and is cyclodextrin phosphate in the hydrolyses of organophosphates; P. and P. are the final products; and ., ., ., ., and . are rate constants for the various processes indicate作者: intertwine 時(shí)間: 2025-3-23 04:56
Zusammenarbeit mit dem Pflegedienstly restricted cavity for the included substrate, which cavity can then serve as reaction medium, resulting in acceleration or deceleration of reaction. These kinds of catalyses are defined as noncovalent catalyses.作者: 聯(lián)想 時(shí)間: 2025-3-23 08:00 作者: Cougar 時(shí)間: 2025-3-23 10:40
,Forschungslücken und Forschungsfragen,tc., in organic reactions. However, there is one serious hortcoming of cyclodextrins as catalysts. That is the hydrolysis rates of acyl-cyclodextrins, intermediates in covalent catalysis of ester hydrolysis, are very slow, thus preventing cyclodextrins from acting as true catalysts. To accelerate th作者: 濃縮 時(shí)間: 2025-3-23 16:33
Phenomenology as Philosophy Sui Generiseospecific, complexing of reactants before reaction per se occurs. The cyclodextrins are the first organic compounds found that show the ability to complex other organic compounds. Their stereospecificity is limited, although they do exhibit stereospecific reactions. As noted above, they do catalyze作者: 熒光 時(shí)間: 2025-3-23 21:34
Properties,he amylase of . on starch and related compounds. Though cyclodextrins were discovered in 1891 by Villiers [12], the first detailed description of their preparation and isolation was made by Schardinger [13–15].作者: 狂熱語(yǔ)言 時(shí)間: 2025-3-23 23:03 作者: Feigned 時(shí)間: 2025-3-24 04:21
Noncovalent Catalyses,ly restricted cavity for the included substrate, which cavity can then serve as reaction medium, resulting in acceleration or deceleration of reaction. These kinds of catalyses are defined as noncovalent catalyses.作者: Noisome 時(shí)間: 2025-3-24 07:37
https://doi.org/10.1007/978-3-540-72266-3It is well known that cyclodextrins can accelerate many kinds of reactions. The reactions accelerated by cyclodextrins range widely (see Table 9).作者: 低三下四之人 時(shí)間: 2025-3-24 12:51 作者: adjacent 時(shí)間: 2025-3-24 17:59 作者: 紋章 時(shí)間: 2025-3-24 21:25 作者: Chauvinistic 時(shí)間: 2025-3-25 01:51
978-3-642-66844-9Springer-Verlag Berlin Heidelberg 1978作者: 使更活躍 時(shí)間: 2025-3-25 05:26 作者: Coordinate 時(shí)間: 2025-3-25 10:48
Properties,he amylase of . on starch and related compounds. Though cyclodextrins were discovered in 1891 by Villiers [12], the first detailed description of their preparation and isolation was made by Schardinger [13–15].作者: 鴿子 時(shí)間: 2025-3-25 13:35
Inclusion Complex Formation,pounds are included in the cavity of cyclodextrins (host) [20, 65–67]. Guest compounds range from polar reagents such as acids, amines, small ions such as ClO., SCN., and halogen anions [68] to highly apolar aliphatic and aromatic hydrocarbons and even rare gases [69]. Inclusion complexes can be for作者: GULF 時(shí)間: 2025-3-25 19:06 作者: FLIC 時(shí)間: 2025-3-25 21:11 作者: colostrum 時(shí)間: 2025-3-26 00:51 作者: 反饋 時(shí)間: 2025-3-26 07:46 作者: 孤僻 時(shí)間: 2025-3-26 09:18
Conclusion,eospecific, complexing of reactants before reaction per se occurs. The cyclodextrins are the first organic compounds found that show the ability to complex other organic compounds. Their stereospecificity is limited, although they do exhibit stereospecific reactions. As noted above, they do catalyze作者: 軟弱 時(shí)間: 2025-3-26 12:37
0341-2377 ing reac- tion. Then came the realization that enzymes which are highly efficient ca- talysts, work by way of prior complexation, often stereospecific, which is then followed by chemical reaction. Thus, systems that exhibit "host-guest" relationships, i.e., that show complexing are being looked at a作者: 執(zhí) 時(shí)間: 2025-3-26 20:12
https://doi.org/10.1007/978-3-540-72266-3h as ClO., SCN., and halogen anions [68] to highly apolar aliphatic and aromatic hydrocarbons and even rare gases [69]. Inclusion complexes can be formed either in solution or in the crystalline state. Water is usually used as solvent, although inclusion complex formation also takes place in dimethyl sulfoxide and in dimethyl formamide [70].作者: 全部 時(shí)間: 2025-3-26 21:39 作者: ligature 時(shí)間: 2025-3-27 02:59
https://doi.org/10.1007/978-3-540-72266-3268], O-alkyl alkylphosphinates [269], and O-alkyl alkylsulfinates [270] were resolved. The maximum optical purities, obtained after repeated precipitation with cyclodextrins followed by fractional crystallization, were 71.5, 84, and 70.2% for sulfoxides, phos-phinates, and sulfmates, respectively.作者: Embolic-Stroke 時(shí)間: 2025-3-27 06:17 作者: 模仿 時(shí)間: 2025-3-27 09:44 作者: 捏造 時(shí)間: 2025-3-27 16:37 作者: SENT 時(shí)間: 2025-3-27 18:31 作者: deforestation 時(shí)間: 2025-3-28 00:18
Improvement by Covalent and Noncovalent Modification, intermediates in covalent catalysis of ester hydrolysis, are very slow, thus preventing cyclodextrins from acting as true catalysts. To accelerate the deacylation step, the addition of amines as nucleophiles were examined.作者: 狂怒 時(shí)間: 2025-3-28 02:24
Phenomenology as Philosophy Sui Generis many organic reactions, in some ways mimicing the action of enzymes. Just as enzymes do not engage in billiard ball chemistry, the cyclodextrins do not engage in billiard ball chemistry (usually). The fact that enzymes can achieve such high rates of reaction indicates that prior complexing followed by reaction must be the chemistry of the future.作者: 肉體 時(shí)間: 2025-3-28 09:26
Angebotsmanagement für hybride IT-Produkteequently, it was found not only could these molecules form insoluble complexes but further that they could form stoichiometric complexes in dilute aqueous solution. So the way was paved for the use of these compounds as enzyme models [3, 4, 6, 7]. This led to their use as potential catalysts, both in enzymatic and non-enzymatic reactions [2].作者: 不如屎殼郎 時(shí)間: 2025-3-28 13:06 作者: 平常 時(shí)間: 2025-3-28 15:57 作者: beta-carotene 時(shí)間: 2025-3-28 21:59 作者: GUEER 時(shí)間: 2025-3-29 00:11
