摘要:

AbstractAcetic anhydride has been used widely in synthetic organic chemistry, especially in syntheses and transformations of heterocyclic compounds. These utilities are reviewed under the following classification.

ISSN:0022-152X    

DOI:10.1002/jhet.5570130201

出版商:Wiley‐Blackwell    

年代:1976

数据来源: WILEY

摘要:

AbstractAroylphenylacetylenes reacted with ethyl phenylacetate and benzyl cyanide in the presence of sodium ethoxide to give 6‐aryl‐3,4‐diphenyl‐2H‐pyran‐2‐ones(2)and 4‐aroyl‐2,3‐cis‐diphenyl‐crotonitriles(11), respectively. The structure and configuration of the products are based on chemical and

ISSN:0022-152X    

DOI:10.1002/jhet.5570130202

出版商:Wiley‐Blackwell    

年代:1976

数据来源: WILEY

摘要:

AbstractThe reaction of the ketene acetals with ethyl azidoformate proceedsviaI‐ethoxycarbonyl‐5,5‐dialkoxy‐Δ2‐1,2,3‐triazolines. The latter decomposes easily at room temperature, the reaction pathway depending on the presence of the substituents at the 4‐position. Thermolysis and photolysis of the 4‐alkyl‐substituted triazolines proceedvia1,3‐diradicals. The photodecomposition of the 4‐unsubstituted triazolines proceeds similarly. The thermal decomposition of the latter is considered either to involve homolytic cleavage of the N1N2bond to give a 1,5‐diradical, or to procee

ISSN:0022-152X    

DOI:10.1002/jhet.5570130203

出版商:Wiley‐Blackwell    

年代:1976

数据来源: WILEY

摘要:

AbstractThe uv, ir, and nmr spectra of a number of hydroxy‐and methoxychromones, substituted only in the benzene ring, were studied. The results are particularly useful in determining the position of the hydroxyl groups. Chromatographic data on paper are also give

ISSN:0022-152X    

DOI:10.1002/jhet.5570130204

出版商:Wiley‐Blackwell    

年代:1976

数据来源: WILEY

摘要:

AbstractThe photochemical reaction of phenanthro[9,10‐d]oxazole with ethanol, 1‐propanol, 2‐propanol, or diethyl ether resulted in the substitution of the 1‐and/or 2‐hydroxyalkyl and/or alkyl groups at the p

ISSN:0022-152X    

DOI:10.1002/jhet.5570130205

出版商:Wiley‐Blackwell    

年代:1976

数据来源: WILEY

摘要:

AbstractThe reaction of sulfene withN,N‐disubstituted 3‐aminomethylene‐2,3‐dihydro‐4‐thiochromanones and‐2,3,5,6‐tetrahydro‐4‐thiopyranones gave 1,4‐cycloadducts which are derivatives of new heterocyclic systems, namely 3,4‐dihydro‐5H‐[1]benzothiopyrano[3,4‐e]‐1,2‐oxathiin and 3,4,7,8‐tetrahydro‐5H‐thiopyrano[3,4‐e]‐1,2‐oxathiin, respectively. Furthermore, some pyrazole derivatives VII and VIII were prepared from 3‐hydroxymethylene‐2,3‐dihydro‐4‐thiochroman

ISSN:0022-152X    

DOI:10.1002/jhet.5570130206

出版商:Wiley‐Blackwell    

年代:1976

数据来源: WILEY

摘要:

AbstractLes spectres photoélectroniques de dérivés de monosuhstitution du thiéno[2,3‐b]thiophène (halogène et méthyle) out été analysés. Les attributions proposées sont confirmées par les effets des di, tri et tetrasubstitutions, et en bon accord avec un

ISSN:0022-152X    

DOI:10.1002/jhet.5570130207

出版商:Wiley‐Blackwell    

年代:1976

数据来源: WILEY

摘要:

Abstract1‐(p‐Methoxyphenyl)‐2,4,6‐triphenylthiabenzene (X) has been synthesized and shown to be more stable than the 1‐phenyl analog. 1‐Phenyl‐2,4,6‐tri(p‐methoxyphenyl)thiabenzene (XVI) was not stable enough to be isolated in pure form and rearranged readily to the isomeric 2‐and 4‐thiopyrans. Only the pure 4‐phenyl‐2,4,6‐tri(p‐methoxyphenyl)thiopy

ISSN:0022-152X    

DOI:10.1002/jhet.5570130208

出版商:Wiley‐Blackwell    

年代:1976

数据来源: WILEY

摘要:

AbstractNous avons étudié par spectroscopie dans le visible les complexes moléculaires de différents indoles substitués en‐1,‐2 ou‐3 avec le chloranile dans le chloroforme, et calculé les constantes d'associations de ces complexes par la méthode de Benesi‐Hildebrand. L'influence du solvant sur les constantes d'association a éte également étudiée dans le cas des complexes méthyl‐2 indole chloranile. Nous avons enfin pu grâce à cette étude, accéder aux potentiels d'ionisations des indoles en utilis

ISSN:0022-152X    

DOI:10.1002/jhet.5570130209

出版商:Wiley‐Blackwell    

年代:1976

数据来源: WILEY

摘要:

AbstractThe mechanism of the reactions of 1‐t‐butyl‐2‐carbomethoxyazelidine and 1‐benzyl‐2‐carbomethoxyazetidine with hydrazine hydrate was investigated. Treatment of 1‐alkyl‐2‐earbomethoxyazetidine with hydrazine hydrate in cold ethanol yielded 1‐alkylazetidine‐2‐carhohydrazide. Depending on the sterie bulkiness of the alkyl group of the amino functionality, reactions of 1‐alkylazetidine‐2‐carbohydrazides in methanol gave the appropriate aminoester or the appropriate pyrrolidone, or a mixture of both. The intermediacy of the diimide in these transformations was confirmed by the concurrent reduction

ISSN:0022-152X    

DOI:10.1002/jhet.5570130210

出版商:Wiley‐Blackwell    

年代:1976

数据来源: WILEY