標題: Titlebook: Strain and Its Implications in Organic Chemistry; Organic Stress and R Armin Meijere,Siegfried Blechert Book 1989 Kluwer Academic Publisher [打印本頁] 作者: 去是公開 時間: 2025-3-21 17:15
書目名稱Strain and Its Implications in Organic Chemistry影響因子(影響力)
書目名稱Strain and Its Implications in Organic Chemistry影響因子(影響力)學科排名
書目名稱Strain and Its Implications in Organic Chemistry網(wǎng)絡(luò)公開度
書目名稱Strain and Its Implications in Organic Chemistry網(wǎng)絡(luò)公開度學科排名
書目名稱Strain and Its Implications in Organic Chemistry被引頻次
書目名稱Strain and Its Implications in Organic Chemistry被引頻次學科排名
書目名稱Strain and Its Implications in Organic Chemistry年度引用
書目名稱Strain and Its Implications in Organic Chemistry年度引用學科排名
書目名稱Strain and Its Implications in Organic Chemistry讀者反饋
書目名稱Strain and Its Implications in Organic Chemistry讀者反饋學科排名
作者: maladorit 時間: 2025-3-21 22:07 作者: right-atrium 時間: 2025-3-22 00:33 作者: 案發(fā)地點 時間: 2025-3-22 07:40 作者: 規(guī)章 時間: 2025-3-22 09:51
Strain and Its Implications in Organic Chemistry978-94-009-0929-8Series ISSN 1389-2185 作者: AER 時間: 2025-3-22 16:54 作者: 孤獨無助 時間: 2025-3-22 20:06 作者: Progesterone 時間: 2025-3-22 23:46
Synthetic and Mechanistic Aspects of the Cyclopropene to Vinylcarbene Rearrangement,eference to the isomers (10). The rate of cyclopropanation of 2,3-dimethylbut-2-ene in the presence of (15) correlates well with the aj constant of the 4-substituent, with a p-value of -0.79, suggesting the development of positive charge at C-3 in the transition state.作者: aerobic 時間: 2025-3-23 03:26
Book 1989atzeburg, a small medieval town situated on a peninsula in lake "Kuchensee· east of Hamburg In northern Germany. With the participation of 53 leading experts from all over the world, the workshop covered the widest possible range from the advancement of bonding theory, new mechanistic insights into 作者: Decibel 時間: 2025-3-23 08:47
1389-2185 eehof In Ratzeburg, a small medieval town situated on a peninsula in lake "Kuchensee· east of Hamburg In northern Germany. With the participation of 53 leading experts from all over the world, the workshop covered the widest possible range from the advancement of bonding theory, new mechanistic insi作者: OWL 時間: 2025-3-23 11:03
Stereoselective Electrocyclizations and Sigmatropic Shifts of Strained Rings: ,!, which cause this stereoselectivity are found to influence the ground-state geometries of cyclobutenes and other substituted small-ring compounds. The study of the electronic effects which promote twisting in a predictable fashion is a new aspect of stereoelectronics which we have named (only partly in jest) “torquoelectronics”!作者: 慢跑 時間: 2025-3-23 13:58
Synthesis of Functionalized Episulfides,tenes, the rearrangement of sulfur ylide formed by an intramolecular carbene reaction, the thionation of methylenecyclopropanones, and the alkenylidene carbene addition with thioketones. Some properties of the unique episulfides thus obtained are also discussed.作者: 柔聲地說 時間: 2025-3-23 18:54
The Cyclopropyl Group in Studies of Enzyme-Catalysed Reactions,es to enzymes and the intrinsic reactivity of substituted cyclopropylcarbinyl radicals. When both factors are taken into account, penetrating insights into the mechanisms of enzyme-catalysed reactions can be obtained by studies of the products of enzyme-catalysed reactions on cyclopropane- containing substrates.作者: 乳白光 時間: 2025-3-24 00:57 作者: 乞討 時間: 2025-3-24 04:13
Generation and Interception of 1-Oxa-2, 3-Cyclohexadiene and 1,2,4-Cyclohexatriene, 6-.-bromo-6-.-fluorobicyclo[3.1.0]hex-2-ene (.) and its benzo derivative ., respectively. On treatment of these compounds with methyllithium in the presence of sty- rene, the interception products . and . of 1, 2, 4-cyclo- hexatriene (.) and its benzoderivative .,respectively, are formed in good yields.作者: FEAT 時間: 2025-3-24 10:35
Cyclobutane-Cyclopentane Interconversion of Coordinated Adducts of Cycloheptatriene and Tetracyanoed not interfere with the reaction. This, together with the kinetic data and the small observed solvent effect k(CD.OD)/k(CDCl.) = 6.8, support a mechanism in which isomerization proceeds via a single step pericyclic [2,2]-sigmahaptotropic rearrangement.作者: debris 時間: 2025-3-24 13:07 作者: quiet-sleep 時間: 2025-3-24 15:52 作者: keloid 時間: 2025-3-24 19:31 作者: 挑剔為人 時間: 2025-3-25 02:05
Quest for Higher Prismanes,ished through novel strategies. Efforts directed towards the conversion of these precursors to [6]-prismane are described. Some experiments enroute to [7]-prismane and [8]-prismane have been explored.作者: Ingredient 時間: 2025-3-25 06:52 作者: acrophobia 時間: 2025-3-25 11:26 作者: Canary 時間: 2025-3-25 13:24
On the Relationship between Strain and Chemical Reactivity of Torsionally Distorted Carbon-Carbon D been obtained. The relationship between strain energy, reaction exothermicity and other spectroscopic parameters to the rate of epoxidation are examined in an effort to identify the chemical manifestations of strain.作者: 無脊椎 時間: 2025-3-25 18:52 作者: 優(yōu)雅 時間: 2025-3-25 23:40
Some Synthetic Implications of the Concept of Cyclopropyl Units as Pseudo-Functional Groups,ng strain can provide a thermodynamic driving force. However, as the comparison of cyclopropanes with cyclobutanes (which have similar strain energies) illustrates, release of such strain energy may not be sufficient for high reactivity. The ir character of the ring bonds of a cyclopropane provides 作者: 拱墻 時間: 2025-3-26 01:12
Stereoselective Electrocyclizations and Sigmatropic Shifts of Strained Rings: ,!,redictions have been tested experimentally. Outward rotations are favored by donors and inward rotations by powerful acceptors. The electronic effects which cause this stereoselectivity are found to influence the ground-state geometries of cyclobutenes and other substituted small-ring compounds. The作者: 猛烈責罵 時間: 2025-3-26 07:15
The Preparation and Thermal Rearrangement of Functionalized 6-(1-Alkenyl)Bicyclo[3.1.0]Hex-2-Enes. quadrone (8), the thermolytic rearrangements of a number of substituted 6-(l-alkenyl)bicyclo[3.1.0]hex-2-enes were investigated. Upon thermolysis, compounds 9, 12, 36, 38, 42, 44, and 58 underwent clean [3,3]-sigmatropic (Cope) rearrangement to provide excellent yields of the functionalized bicyclo[作者: homocysteine 時間: 2025-3-26 11:50
Synthesis with Donor-Acceptor-Substituted Vinylcyclopropanes,s well as simple ring cleavage variants are described. In-situ reaction of the liberated enones with hetero nucleophiles or carbon nucleophiles allows preparation of a variety of functionalized γ-oxocarboxylate derivatives. Of special interest are adducts obtained from nitro alkanes in high yields. 作者: Crayon 時間: 2025-3-26 13:32
Synthesis of Functionalized Episulfides,es of substituted allene episulfides and 1,2,3- butatriene episulfide derivatives are readily obtained in the reactions of diazo compounds with thioketenes, the rearrangement of sulfur ylide formed by an intramolecular carbene reaction, the thionation of methylenecyclopropanones, and the alkenyliden作者: jet-lag 時間: 2025-3-26 16:48
Through-Bond Interaction Via Cyclobutane Relay Orbitals as a Means of Extending Conjugation,5.3.0.0.]deca-3,5-diene (13) has been synthesized from dimethyl ε-truxillate. Stepwise belting of a preformed all-trans 1,2,3,4-tetrasubstituted cyclobutane with proper differentiation of the 1,3- and 2,4-positions is crucial to successful twofold annulation. The response of these structurally unusu作者: 墻壁 時間: 2025-3-26 23:23
[2+3] Carbo- and Hetero-Cyclic Annulation in the Design of Complex Molecules.1,omocrotonate to enones, aldehydes, and some imines, or by a [4+1] protocol that utilized the intramolecular cycloadditions of diazoketones or azides to 1,3-dienes. The resulting strained 3-membered rings provided, through their energy contents, the necessary driving force for the corresponding rearr作者: moribund 時間: 2025-3-27 01:41 作者: 有惡臭 時間: 2025-3-27 06:51 作者: colostrum 時間: 2025-3-27 10:12 作者: synovitis 時間: 2025-3-27 17:30
Chemical Behaviour of Cation Radicals Derived from Strained Molecules in Solution. Spiro-Activationilizing groups in a geminal manner, are highly reactive in the thermal reactions with TCNE or DDQ. The reaction with TCNE produces a five-membered . adduct, whereas the product isolated in the reaction of methyl-substituted substrate with DDQ is a Diels-Alder adduct after ring-cleaving dehydrogenati作者: 危險 時間: 2025-3-27 18:05 作者: Limited 時間: 2025-3-27 22:42
Intramolecular [2+2] Cycloadditons of Ketenes and Olefins,bi- and tricyclic cyclobutanones. The major side reaction, namely the dimerization of the ketene is prevented by the introduction of conformational restrictions. This has been achieved by an additional double bond or by an annulated ring system. Following this strategy C-analogues of a penem and a c作者: Gossamer 時間: 2025-3-28 02:35
The Generation and Rearrangement of 2-Diazocarbonyl Cyclobutanones: The Formation of 5-Spirocyclopr these materials as well as the conjugation extended 5-alkylidene and arylidene derivatives have been reported. In light of this, it is curious that 5-spirocyclopropyl Δ. butenolides are, virtually unknown2 in spite of the fact that they represent a homoconjugated variation of the 5-alkylidene deriv作者: grieve 時間: 2025-3-28 07:51
Cyclobutane-Cyclopentane Interconversion of Coordinated Adducts of Cycloheptatriene and Tetracyanoea 2:3 ratio. The rate constants for the interconversion process in CDC1. were evaluated by the spin saturation transfer technique, and in CD.OD by variable temperature line shape analysis. The rate constant for the 3+ 2 2+ 2 rearrangement in CDC1. k. 0.19 ±0.03 s. with ΔG 18.37 . 0.10 kcal/mol at 24作者: Plaque 時間: 2025-3-28 12:09 作者: QUAIL 時間: 2025-3-28 15:50 作者: 懶洋洋 時間: 2025-3-28 21:30 作者: 無底 時間: 2025-3-28 23:05
Kendall N. Houkto trade and in pushing liberalization ahead in more and more sectors of the economy, including the key sector of services. Lowered tariffs have reduced national frontiers as barriers to trade, and have facilitated transnational production and distribution. From the Geneva Round in 1947 to the Urugu作者: Amnesty 時間: 2025-3-29 06:27 作者: AVANT 時間: 2025-3-29 07:43 作者: 不真 時間: 2025-3-29 15:16
Wataru Ando,Norihiro Tokitohn within the human rights treaty regime, enforcement of victims’ right to redress is normally delegated to domestic courts, as discussed in Chapter V. In practice, however, the access of victims and survivors of genocide, crimes against humanity, war crimes or other crimes under international law, t作者: 膠狀 時間: 2025-3-29 18:04
Leo A. Paquette,Jürgen Dresselion, it is valuable to trace the origins and evolution of this right in different legal traditions. Although most of the world’s legal and cultural traditions have long embraced the basic principle of victims’ redress, the rise of retributive approaches gradually eroded the central position victims 作者: 領(lǐng)袖氣質(zhì) 時間: 2025-3-29 21:30
T. Hudlicky,A. Fleming,T. Lovelace,G. Seoane,K. Gadamasetti,G. Sinai-Zingdegnoring the real causes of inequality. The main impact of the book is to highlight the importance of self-ownership and private property, showing how market participation advances liberty and prosperity...The idea that we should pay reparations to disadvantaged racial groups as compensation for hist作者: 無所不知 時間: 2025-3-30 00:21 作者: MOCK 時間: 2025-3-30 06:17 作者: narcissism 時間: 2025-3-30 09:41
Kenneth J. Sheaeged . (who are recalled, reported, prosecuted, convicted, or acquitted), their family members past (and present), and friends; or . (government, church, and other organizations).; and as . (citizens with information, staff working at the institutions, police officers, journalists, prosecutors, judg作者: 表否定 時間: 2025-3-30 14:10 作者: intrude 時間: 2025-3-30 18:13 作者: BUMP 時間: 2025-3-30 22:48 作者: Inflamed 時間: 2025-3-31 03:28
R. D. Miller,W. Theis,G. Heilig,S. Kirchmeyerat IS III world-wide use by thousands of scientists, engineers, and mathematicians. Although it traces its beginnings to 1963, until recently it has only been available on main-frame computers because of its relatively large resource requirements. In 1980 I predicted (1) that by the mid-1980‘s it wo作者: 打折 時間: 2025-3-31 06:49 作者: GEN 時間: 2025-3-31 10:59 作者: 一窩小鳥 時間: 2025-3-31 16:20
Synthesis with Donor-Acceptor-Substituted Vinylcyclopropanes,cceptor-substituted vinylcyclopropanes by use of Fischer carbene complexes is also represented. Thus, vinyl-substituted Cr(0) carbene complexes transfer this ligand cleanly to electron-deficient alkenes to afford vinylcyclopropanes. The second route to these compounds involves methyl dienoates and t作者: Customary 時間: 2025-3-31 20:57
Book 1989e convergent synthetic routes and Improve the necessary chemo-, regio-and stereo-selectivity. This book presents all of the 20 Invited lectures and is complemented with short versions of 12 contributed papers and 13 poster presentations. I am convinced that it will stimulate further rapid developmen作者: 柔軟 時間: 2025-3-31 22:16 作者: 繁榮地區(qū) 時間: 2025-4-1 03:02
Barry M. Trost and the rule-based system provides business enterprises or exporters with a predictable environment in which they can plan and develop their production without fear that foreign markets may be lost or disrupted by government practices such as the raising of tariffs or the imposition of prohibitions作者: 膽大 時間: 2025-4-1 06:49 作者: AGATE 時間: 2025-4-1 10:16 作者: 裁決 時間: 2025-4-1 15:08
