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3,3,4,4,5,5-Hexamethyl-1,2-bis(methylene)cyclopentane 3、3、4、4、5、5-Hexamethyl-1,以亚甲基环戊烷
Gazzetta Chimica Italiana Pub Date : 1991-01-01 DOI: 10.5282/UBM/EPUB.3939
H. Mayr, J. Baran, U. W. Heigl
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引用次数: 0
13C NMR Study of 2,6-Di-t-butyl-4-arylpyrylium and Thiopyrylium Cations. Carbon Shifts versus Reactivities 2,6-二叔丁基-4-芳基吡啶和硫代吡啶阳离子的13C核磁共振研究。碳位移与反应性
Gazzetta Chimica Italiana Pub Date : 1988-09-13 DOI: 10.1002/CHIN.198837059
G. Cerichelli, G. Doddi, G. Ercolani
{"title":"13C NMR Study of 2,6-Di-t-butyl-4-arylpyrylium and Thiopyrylium Cations. Carbon Shifts versus Reactivities","authors":"G. Cerichelli, G. Doddi, G. Ercolani","doi":"10.1002/CHIN.198837059","DOIUrl":"https://doi.org/10.1002/CHIN.198837059","url":null,"abstract":"The carbon shifts of 2,6-di-t-butyl-4-arylpyrylium and thiopyrylium cations (aryl = XC6H4- with X = p-N02 , m-Cl, p-Cl, H, p-Me, p-MeO, p-NMe2 ) have been determined in CD3CN. While the C-4 chemical shifts of the two heteroaromatic rings are largely affected by rr-polarization, as shown by \u0000the shielding induced by electron-withdrawing substituents, the C-2 (C-6) chemical shifts are free from such effect. The C-2 (C-6) and C-4 chemical shifts have been compared with the corresponding second-order rate constants for the methoxide attachment to C-2 (C-6) and C-4 positions (k2 and k4 , respectively), obtained in MeOH at 25 °C. For both the cation series the C-2 (C-6) chemical shifts are linearly correlated with the corresponding log k2 values, thus suggesting a charge control for the methoxide attachment to these cations. At variance, the C-4 chemical shifts do not show any correlation with log k4 values. Thus, whenever the chemical shifts are affected by 1t -polarization, they are no longer reliable indicators of reactivity changes, despite the dominant role of charge-charge interactions in the transition state.","PeriodicalId":12702,"journal":{"name":"Gazzetta Chimica Italiana","volume":"35 1","pages":"291-294"},"PeriodicalIF":0.0,"publicationDate":"1988-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86271193","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
RING CONTRACTIONS IN THE CONVERSION OF UNHINDERED RACEMIC PYRANOSIDE 4-O-MESYLATES INTO FURANOSIDE 5-O-BENZOATES 无阻碍外消旋吡喃糖苷4- o -甲酰基酯转化为呋喃糖苷5- o -苯甲酸酯时的环收缩
Gazzetta Chimica Italiana Pub Date : 1985-06-25 DOI: 10.1002/CHIN.198525358
G. Berti, G. Catelani, F. Colonna, M. Ferretti, L. Monti
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引用次数: 3
Phase-Transfer Catalysts: Synthesis and Catalytic Activity of Alkyl Substituted Aza-Macrobicyclic Polyether 相转移催化剂:烷基取代氮杂环聚醚的合成及其催化活性
Gazzetta Chimica Italiana Pub Date : 1977-09-06 DOI: 10.1002/CHIN.197736282
M. Cinquini, F. Montanari, P. Tundo
{"title":"Phase-Transfer Catalysts: Synthesis and Catalytic Activity of Alkyl Substituted Aza-Macrobicyclic Polyether","authors":"M. Cinquini, F. Montanari, P. Tundo","doi":"10.1002/CHIN.197736282","DOIUrl":"https://doi.org/10.1002/CHIN.197736282","url":null,"abstract":"","PeriodicalId":12702,"journal":{"name":"Gazzetta Chimica Italiana","volume":"11 1","pages":"11-14"},"PeriodicalIF":0.0,"publicationDate":"1977-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88010711","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: 11
Synthesis and Properties of Cobalt(I) and Iron(II) Complexes with Carbonyls, Phosphines, and Isocyanides 钴(I)和铁(II)与羰基、膦和异氰酸酯配合物的合成和性质
Gazzetta Chimica Italiana Pub Date : 1974-01-01 DOI: 10.1002/CHIN.197506380
G. Albertin, E. Bordignon, U. Croatto, A. Orio
{"title":"Synthesis and Properties of Cobalt(I) and Iron(II) Complexes with Carbonyls, Phosphines, and Isocyanides","authors":"G. Albertin, E. Bordignon, U. Croatto, A. Orio","doi":"10.1002/CHIN.197506380","DOIUrl":"https://doi.org/10.1002/CHIN.197506380","url":null,"abstract":"","PeriodicalId":12702,"journal":{"name":"Gazzetta Chimica Italiana","volume":"191 1","pages":"1041-1057"},"PeriodicalIF":0.0,"publicationDate":"1974-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83064434","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: 15
[Synthesis of 6-substituted steroid hormone analogs]. [6-取代类固醇激素类似物的合成]。
Gazzetta Chimica Italiana Pub Date : 1961-01-01
R Sciaky
{"title":"[Synthesis of 6-substituted steroid hormone analogs].","authors":"R Sciaky","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":12702,"journal":{"name":"Gazzetta Chimica Italiana","volume":"91 ","pages":"545-61"},"PeriodicalIF":0.0,"publicationDate":"1961-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"22032828","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: 0
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