Journal of The Chemical Society B: Physical Organic最新文献_第2页

Crystal and molecular structure of 4,7-di-(2-thienyl)-4,5,6,7-tetrahydrobenzo[b]thiophen 4,7-二-(2-噻吩基)-4,5,6,7-四氢苯并[b]噻吩的晶体和分子结构

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710000843

D. M. Hawley, G. Ferguson

引用次数: 3

Crystal and molecular structure of 8,12-diethyl-2,3,7,13,17,18-hexamethylcorrole 8,12-二乙基-2,3,7,13,17,18-六甲基氯的晶体和分子结构

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710000640

H. R. Harrison, O. Hodder, D. Hodgkin

引用次数: 25

N-substituted heterocyclic cations. Part IX. The preparation and chloride-ion catalysed unimolecular acidolysis of 2-[chloromercury(II)]-1,3-dimethylbenzimidazolium ions in aqueous solution n取代杂环阳离子。第九部分。水溶液中2-[氯汞(II)]-1,3-二甲基苯并咪唑离子的制备及氯离子催化单分子酸解

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710001380

C. Cooksey, D. Dodd, M. D. Johnson

引用次数: 4

Configuration of the S-alkyl thiohydroximates: crystal-structure analysis of the syn-(alkylthio)-isomer of S-cyanoethyl acetothiohydroximate s -烷基硫代羟肟酸盐的构型:s -氰乙酯乙酰硫代羟肟酸盐的合成(烷基硫)异构体的晶体结构分析

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710001102

M. Waite, G. Sim

引用次数: 4

A modification to the ferrioxalate actinometer 对草酸铁辐射计的改进

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710002081

K. C. Kurien

引用次数: 41

Reactivity of vinyl sulphonic esters. Part V. Stereochemistry and rearrangements in SN1 reactions of β-thiovinyl trinitrobenzenesulphonates 乙烯基磺酸酯的反应性。第五部分:β-巯基三硝基苯磺酸盐SN1反应的立体化学和重排

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710000381

G. Modena, U. Tonellato

{"title":"Reactivity of vinyl sulphonic esters. Part V. Stereochemistry and rearrangements in SN1 reactions of β-thiovinyl trinitrobenzenesulphonates","authors":"G. Modena, U. Tonellato","doi":"10.1039/J29710000381","DOIUrl":"https://doi.org/10.1039/J29710000381","url":null,"abstract":"The SN1 methanolysis of 2-phenylthio-1,2-di-p-tolylvinyl 2,4,6-trinitrobenzenesulphonates in 4:1 acetone–methanol at 25 °C is at least 97% stereospecific. ‘Retention’ of configuration is probably involved. The pair of structural isomers 2-phenyl-2-phenylthio-1-p-tolylvinyl and 1-phenyl-2-phenylthio-2-p-tolylvinyl trinitrobenzene-sulphonates was prepared in mixtures of different composition (from 3:1 to 1:2). The methanolysis in 4:1 acetone–methanol at 25 °C of such mixtures gives the two isomers, 1-methoxy-2-phenyl-2-phenylthio-1-p-tolylethylene and 1-methoxy-1-phenyl-2-phenylthio-2-p-tolylethylene in a ratio of ca. 4·5:1. This ratio is independent on the proportion of the two isomers in the starting material. Similarly, in nitromethane at 25 °C, mixtures of the p-tolylthio-analogues give the two isomers, 6-methyl-2-phenyl-3-p-tolylbenzo[b]thiophen and 6-methyl-2-p-tolyl-3-phenylbenzo[b]thiophen in a ratio of 5:1 independently on the isomeric distribution in the reagents.Both retention of configuration and migration of the β-arylthio-group are evidence of β-sulphur participation and indicate that a bridged structure, probably a thiirenium ion, is involved as an intermediate in an SN1 reaction of β-arylthiovinyl sulphonic esters.","PeriodicalId":17268,"journal":{"name":"Journal of The Chemical Society B: Physical Organic","volume":"57 1","pages":"381-385"},"PeriodicalIF":0.0,"publicationDate":"1971-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80238726","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: 4

Hydrolysis of acylchymotrypsins 酰基胰酶的水解

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710002401

Andrew Williams, G. Salvadori

引用次数: 6

Cyclic sulphones. Part XI. Extensive delocalisation in benzo- and dibenzo-thiopyran SS-dioxide anions 循环砜。苯并和二苯并硫吡喃ss -二氧化阴离子的广泛脱域

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710000545

S. Bradamante, A. Mangia, G. Pagani

引用次数: 5

The mechanism of oxidation of α-glycols by periodic acid. Part X. The oxidation of pinacol, and a general discussion of the stability of periodate esters and their role in the mechanism of oxidation α-二醇被周期酸氧化的机理。第十部分:品纳考的氧化，并对高碘酸酯的稳定性及其在氧化机制中的作用进行了一般性讨论

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710002128

G. Buist, C. A. Bunton, W. S. P. Hipperson

{"title":"The mechanism of oxidation of α-glycols by periodic acid. Part X. The oxidation of pinacol, and a general discussion of the stability of periodate esters and their role in the mechanism of oxidation","authors":"G. Buist, C. A. Bunton, W. S. P. Hipperson","doi":"10.1039/J29710002128","DOIUrl":"https://doi.org/10.1039/J29710002128","url":null,"abstract":"The kinetics of oxidation of pinacol by periodate have been studied at 0° and 25° over the range pH 0–13. The kinetics are second order except at 0° and pH >11. Under the latter conditions, with excess pinacol, the kinetics are those of consecutive first-order reactions, showing that an intermediate is being formed in appreciable concentration. Several features of the kinetics resemble closely those observed for the formation of the cyclic ester from propane-1,2-diol and periodate. It is concluded that the oxidations of pinacol and propane-1,2-diol by periodate proceed via a mechanism which is probably common to all oxidations of 1,2-diols by periodate, viz. the formation of a periodate monoester, followed by ring-closure to a cyclic ester, then decomposition of a monoanion of the cyclic ester to the reaction products. The stages of the mechanism are discussed in detail, and it is shown that the different types of pH dependence observed in the oxidation of 1,2-diols by periodate can be readily accommodated by this mechanism. The stability of the periodate esters is discussed, and it is concluded that the general order of stability of esters containing six-co-ordinated iodine is: cyclic triester > cyclic diester (5-membered ring) > cyclic diester (6-membered ring) > monoester. A comparison of the acid strengths of H5IO6 and cyclic periodate esters suggests that the periodiate di- and tri-anions are appreciably dehydrated in aqueous solution to HIO52– and IO53–.","PeriodicalId":17268,"journal":{"name":"Journal of The Chemical Society B: Physical Organic","volume":"24 1","pages":"2128-2142"},"PeriodicalIF":0.0,"publicationDate":"1971-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81531082","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: 22

Substitution reactions in cyclic systems. Displacement reactions of some sterically hindered tosylates 循环体系中的取代反应。一些位阻苯甲酸酯的位移反应

Journal of The Chemical Society B: Physical Organic Pub Date : 1971-01-01 DOI: 10.1039/J29710001214

I. Rothberg, R. Russo

引用次数: 1