Journal of The Chemical Society B: Physical Organic最新文献_第4页

Crystal and molecular structure of thalidomide, N-(α-glutarimido)-phthalimide 沙利度胺N-(α-戊二胺)-邻苯二胺的晶体和分子结构

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710001073

F. Allen, J. Trotter

引用次数: 21

Transmission of substituent effects in pyridines. Part IV. Alkaline hydrolysis of methyl diazinecarboxylates 吡啶中取代基效应的传递。第四部分:甲基二嗪羧酸盐的碱性水解

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710001962

L. Deady, D. Foskey, R. Shanks

引用次数: 3

Reactivity parameters and aromatic systems. Part III. Reactivity relationships, and their application to substituent effects in aromatic systems 反应性参数和芳香体系。第三部分。反应性关系及其在芳香体系取代基效应中的应用

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710001221

K. Bancroft, G. R. Howe

{"title":"Reactivity parameters and aromatic systems. Part III. Reactivity relationships, and their application to substituent effects in aromatic systems","authors":"K. Bancroft, G. R. Howe","doi":"10.1039/J29710001221","DOIUrl":"https://doi.org/10.1039/J29710001221","url":null,"abstract":"The principles underlying various reactivity and free-energy relationships are examined. A generalised relationship is derived which incorporates many of those presently accepted, e.g., the Hammett, Yukawa Tsuno, and Taft equations. Three new semi-empirical relationships are derived with differing numbers of constraints. The four factors commonly given independent recognition are represented as, the substituent S, the position of the substituent relative to the position of the reaction P, the reagent–solvent system R, and a factor characteristic of the type of reaction and its corresponding free-energy requirement T. In the first equation the rate or equilibrium of a particular reaction is related to an arbitrary reaction by log k/k0=A+ρ(FX+MY) where F=p(ST), M=r(ST)X=p(P), Y=r(P), ρ=pR=rR, superscripts p and r referring to polar and resonance effects respectively.The second equation log k/k0=A+BFX+CMY corresponds to the first equation with the constraint pR=rR removed, B corresponding to pR and C to rR. In the third equation, log k/k0=A+BpTFX+CrTMY, only the ratio pT to pR can in practice be derived, and then only under the assumption that B=C. Substituent effect data for the naphthalene and fluoranthene systems are considered. For transmission coefficients of delocalisation effects in electrophilic substitution qw values are slightly better than atom–atom polarisabilities. As a measure of the direct field effect of a substituent both 1/d and (cos θ)/d give in most cases equally good results. There is indication that with an improved model separation of the reaction parameter into a type parameter T and a reagent–solvent parameter R may well be viable.","PeriodicalId":17268,"journal":{"name":"Journal of The Chemical Society B: Physical Organic","volume":"1 1","pages":"1221-1227"},"PeriodicalIF":0.0,"publicationDate":"1971-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82133234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Spectroscopic studies of keto–enol equilibria. Part XIII. 15N-substituted imines 酮-烯醇平衡的光谱研究。十三。15 n -亚胺

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710001356

G. Dudek, E. Dudek

引用次数: 27

Crystal structure of the C form of stearic acid 硬脂酸C型的晶体结构

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710000548

V. Malta, G. Celotti, R. Zannetti, A. F. Martelli

引用次数: 76

Free-radical reductions of arenediazonium ions in aqueous solution. Part I. Toluene-p-diazonium ions reduced with methanol 水溶液中氨基重氮离子的自由基还原。第一部分:用甲醇还原甲苯-对重氮离子

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710001574

J. Packer, D. House, E. J. Rasburn

引用次数: 8

Substituent effects in aromatic proton nuclear magnetic resonance spectra. Part VII. [2H6]Benzene-induced solvent shifts at high solute concentration 芳香质子核磁共振谱中的取代基效应。第七部分。[2H6]在高溶质浓度下，苯诱导溶剂位移

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710001884

Y. Takeuchi

引用次数: 3

X-ray studies of terpenoids. Part III. A redetermination of the crystal structure of (+)-3-bromocamphor: the absolute configuration of (+)-camphor 萜类化合物的x射线研究。第三部分。(+)-3-溴樟脑晶体结构的再测定:(+)-樟脑的绝对构型

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710000632

F. Allen, D. Rogers

引用次数: 9

The reactivity of organophosphorus compounds. Part XXVII. Reactions of alkyl hydrogen alkylphosphonates with p-nitrobenzonitrile oxide: anchimerically assisted P–O fission in acidic hydrolysis of the resulting α-hydroxyimino-p-nitrobenzyl alkylphosphonates 有机磷化合物的反应性。第二十七一部分。烷基烷基膦酸氢与对硝基苯基氧化腈的反应:α-羟基亚胺-对硝基苯基烷基膦酸酯在酸性水解中的化学辅助P-O裂变

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710001988

J. Cadogan, J. A. Challis, D. Eastlick

{"title":"The reactivity of organophosphorus compounds. Part XXVII. Reactions of alkyl hydrogen alkylphosphonates with p-nitrobenzonitrile oxide: anchimerically assisted P–O fission in acidic hydrolysis of the resulting α-hydroxyimino-p-nitrobenzyl alkylphosphonates","authors":"J. Cadogan, J. A. Challis, D. Eastlick","doi":"10.1039/J29710001988","DOIUrl":"https://doi.org/10.1039/J29710001988","url":null,"abstract":"p-Nitrobenzonitrile oxide reacts readily with alkyl hydrogen alkylphosphonates (I; R1= Me, R2= Me, Et, Pr, Pri, ButCH2, or ButCHMe) and (I; R1= Et, But, or Ph; R2= Et), diethyl hydrogen phosphate, and hydrogen diethylphosphinate to give the corresponding 1:1-adducts, alkyl α-hydroxyimino-p-nitrobenzyl alkylphosphonates (II; R1= Me; R2= Me, Et, Pr, Pri, ButCH2, or ButCHMe) and (II; R1= Et, But or Ph; R2= Et), diethyl α-hydroxyimino-p-nitrobenzyl phosphate (II; R1= EtO, R2= Et), and α-hydroxyimino-p-nitrobenzyl diethyl-phosphinate (III), respectively. Except for the last case, which is stable in acid, the adducts undergo very fast, anchimerically assisted, P–O fission at pH 2–3·5 in dilute aqueous dioxan (ca. 107 faster, as shown by a kinetic study, than corresponding hydrolysis of simple esters which undergo alkyl–oxygen fission under similar conditions). Transesterification, also very fast, proceeds similarly, while the O-methyl derivative of (II; R1= Me; R2= ButCH2) is stable at pH 2–4·5. The results point to a novel neighbouring-group acceleration involving the proton of the oxime group in (II).","PeriodicalId":17268,"journal":{"name":"Journal of The Chemical Society B: Physical Organic","volume":"37 1","pages":"1988-1995"},"PeriodicalIF":0.0,"publicationDate":"1971-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76453684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Pyrrole studies. Part XVI. Conformational studies of 6-aryl-6-di-methylamino-2-azafulvenes [2-aryl(dimethylamino)methylenepyrroles] 吡咯的研究。十六。6-芳基-6-二甲基氨基-2-氮杂环烯[2-芳基(二甲基氨基)亚甲基]构象研究

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710001405

C. Candy, R. Jones

引用次数: 4