摘要:

AbstractCette étude porte sur les antimoniates de potassium, sodium, baryum, argent et plomb, considérés à l'état solide, à froid, et après déshydratation par chauffage. Pour chacun d'eux, on a enregistré le spectre d'absorption infrarouge, entre 600 et 2000 cm−1et la courbe de thermolyse, entre 20° et 1000° C, afin, 1° de vérifier la formule dePaulingpour les produits non chauffés, 2° de connaitre la structure des corps qui en dériv

ISSN:0165-0513    

DOI:10.1002/recl.19520710202

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractA method is described suitable for the determination of deuterium in organic compounds by means of a mass spectrometer.

ISSN:0165-0513    

DOI:10.1002/recl.19520710203

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractPurification of the cyclanes with 4 to 9 C‐atoms was effected by fractional distillation. Progress of the purification was checked with the aid of melting curves of the fractions (heat content vs. temperature curves of the melting process). The impurity content of the final samples is estimated at less than 0,2%. A fractionating column with a rotating cylinder and a small calorimeter for measurements on melting and transition processes at temperatures from — 180° to +70° are desc

ISSN:0165-0513    

DOI:10.1002/recl.19520710204

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractWhen tetraglycine methyl ester is heated at 100° C a decrease in methoxyl content is observed, mainly after an induction period of about 200 hours. The reaction is virtually finished after 600 hours. Previous powdering of the ester crystals slightly reduces the induction period. The reaction product mainly consists of a mixture of tetraglycine, N‐methyl‐glycyl‐triglycine (sarcosyl‐triglycine) and N‐dimethylglycyl‐triglycine.When alanyl‐triglycine methyl ester is heated at 100° C the induction period extends over

ISSN:0165-0513    

DOI:10.1002/recl.19520710205

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractL'auteur étudie la condensation du benzaldéhyde sur la méthylisobutylcétone et la méthylamylcétone. Les propriétés chimiques des styryl‐alkyls cétones obtenues sont

ISSN:0165-0513    

DOI:10.1002/recl.19520710206

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19520710207

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractThe infrared absorption curves of 18 acetals and ketals have been measured in the region 1070–1190 cm−1.The C—O—C band at 1130 cm−1(ethers) is split in the case of acetals and ketals (C‐O‐C‐O‐C) into three branches: at 1158—1190 cm−1at 1124—1143 cm−1and at 1063—1098 cm−1.The molecular extinction coefficient of the last band is 2—5.104. A fourth band appears in the region 1038—1056 cm−1.A tentative explanation of the observed effects is given.Another characteristic band, at 1110 cm−1appears only in the spectra of acetals, not in those of ketals, and may be related to a C—H deformatio

ISSN:0165-0513    

DOI:10.1002/recl.19520710208

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

Abstract(1)The condensation of a number of carbonyl compounds with ethanolamine and with amino‐alcohols having a tertiary hydroxy‐ and a primary amino‐group, has been studied. The molecular refraction and the infrared spectrum have been used to distinguish between the oxazolidine and Schiff's base structures which are both possible for the condensation products.(2)Aromatic and α,β‐unsaturated carbonyl compounds, on the whole, tend to form Schiff's bases, saturated carbonyl compounds oxazolidines, with ethanolamine. Introduction of C‐alkyl groups into the ethanolamine system favours the formation of oxazolidines even with aromatic aldehydes and ketones.(3)In the infrared spectrum of simple CN‐compounds in alcoholic solution, a solvation effect has been observed. Also, the tautomerisability of substances containing the system CH−1—CN, to HC  C—NH has been demonstrated.(4)The (non‐conjugated) CN double bond absorbs in the infrared at about 1670 cm−21whilst the oxazolidine system is characterised by three bands (1149—1185; 1116—1139; 1086—1118 cm−1)in the 1100—1200 cm−1region.(5)The similarity of the infrared spectra of all heterocycli

ISSN:0165-0513    

DOI:10.1002/recl.19520710209

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

AbstractFor a number of products of the condensation between ethanolamine or 2‐amino‐3‐methyl‐butanol‐3 and aromatic aldehydes and ketones. the ultraviolet spectrum has been measured. The observations have been used to distinguish between oxazolidine and Schiff's base structures of the condensation products.The agreement between the results and the conclusions derived from measurements of the molecular refraction and the infrared spectrum, is satisfactory.For a number of simple model substances, too, the ultraviolet spectra have been measured, in order to determine the characteristics of the C

ISSN:0165-0513    

DOI:10.1002/recl.19520710210

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY

摘要:

Abstract(1)Eight ketones and p‐chlorobenzaldehyde have been condensed with ethylenediamine. Only cyclohexanone and its methyl‐derivatives give imidazolidines; in all other cases, double Schiff's bases are formed. The assignment of structures is based on the infrared spectrum.(2)The infrared spectra of two hexahydropyrimidine derivatives have been studied for the sake of comparison.(3)The ultraviolet spectra of the double Schiff's bases have been measured.(4)The similarity in the infrared spectrum of 1,3‐dioxolanes, oxazolidines, imidazolidines and thioxolanes is stressed. Two representatives of the last class of compounds have been prepared and their physical properties st

ISSN:0165-0513    

DOI:10.1002/recl.19520710211

出版商:WILEY‐VCH Verlag    

年代:1952

数据来源: WILEY