ISSN:0570-0833    

DOI:10.1002/anie.196304931

出版商:Hüthig&Wepf Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractWhereas rapid strides have recently been made in the chemistry of the silyls of nonmetals, our knowledge of metal silyls is still scanty. Silyl compounds with every nonmetal are now known, but the literature on metal silyls is almost entirely restricted to silyl compounds of the alkali metals. This is all the more surprising, since the closely related field of elementalhomologous organometallic compounds of the type M(CR3)n(Where M = metal, R = hydrogen and/or organic residue, and n = valence of the metal) is among the most interesting and extensively studied areas of chemistry. This report will therefore deal with the results of recent investigations on metal silyls which led beyond the alkali silyls to silyl compounds of the alkaline earth metals, zinc, mercury, aluminum, and tin.

ISSN:0570-0833    

DOI:10.1002/anie.196305071

出版商:Hüthig&Wepf Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractMethylation of mono‐, oligo‐, and polysaccharides with methyl iodide/barium oxide or dimethyl sulfate/barium hydroxide in dimethyl sulfoxide as solvent rapidly leads to high degrees of methylation. Depending on the structure and solubility of the substrate, permethylation can be achieved either in one operation or by repetition of the same treatment. Procedures of permethylation of various carbohydrates are given. The methyl glycosides obtained on methanolysis can be separated and determined quantitatively by gas chromatography. The preparation of separating columns with minimum retention for this purpose is described. Pullulan was shown to have the structure of a completely linear polymer of maltotriose units connected by α‐1→6‐linkages. – In addition the gaschromatographic identification of methyl ethers of glucosamine and galactosamine

ISSN:0570-0833    

DOI:10.1002/anie.196305151

出版商:Hüthig&Wepf Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractMeasurements on semimetals have been continued. Studies of the dependence on temperature of various properties have provided details regarding the transition from the nonmetallic to the more metallic structure. A second‐order transition has been found for tin at 170 °C, in which the c‐axis remains unchanged, while the a‐axis undergoes a small, discontinuous elon

ISSN:0570-0833    

DOI:10.1002/anie.196305231

出版商:Hüthig&Wepf Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractThe preparation, properties, and structure of cyclic and acyclic sulfur‐nitrogen halides are discussed. In the cyclic compounds, SN rings with localised and delocalized π‐bonds occur. In acyclic halides, SN triple bonds are observed. Organic iminosulfur dihalides are d

ISSN:0570-0833    

DOI:10.1002/anie.196305301

出版商:Hüthig&Wepf Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractIn biochemical work with isotopic tracers, it is frequently advantageous to investigate samples in the gas phase. In this way, the selectivity of gas‐chromatographic separating columns and the sensitivity of detectors can be utilized for both the detection of gas‐chromatographic fractions and the determination of their radioactive portions. Conversion of materials separated by gas chromatography into a single standard chemical compound prior to measurement of the radioactivity is recommended. Methods suitable for14C‐labelled compounds can also be applied to those labelled with3H

ISSN:0570-0833    

DOI:10.1002/anie.196305401

出版商:Hüthig&Wepf Verlag    

年代:1963

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.196305451

出版商:Hüthig&Wepf Verlag    

年代:1963

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.196305462

出版商:Hüthig&Wepf Verlag    

年代:1963

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.196305472

出版商:Hüthig&Wepf Verlag    

年代:1963

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.196305482

出版商:Hüthig&Wepf Verlag    

年代:1963

数据来源: WILEY