摘要:

AbstractThe presence of diimine in solution can be shown conclusively by the stereospecific cishydrogenation of symmetrical multiple bonds. Apart from reactions which have hitherto been attributed to hydrazine, this review deals primarily with the various sources and secondary reactions of diimine.

ISSN:0570-0833    

DOI:10.1002/anie.196502711

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractIt is possible to study the very rapid exchange rates between molecules or ions, L, coordinated to paramagnetic ions and the free molecules or ions, L*, in the body of the solution by measuring the line width of the NMR signal of L*.\documentclass{article}\usepackage{amssymb}\pagestyle{empty}\begin{document}$${\rm ML}_{\rm n} + {\rm L}^{*} \rightleftharpoons {\rm ML}_{\rm n}^{*} + {\rm L}$$\end{document}Lifetimes of coordinated ligands that can be measured fall into the range of milliseconds to microseconds. The lifetime, or an upper limit to the lifetime, can be measured directly.

ISSN:0570-0833    

DOI:10.1002/anie.196502811

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractFor syntheses in the carotenoid field using the Wittig reaction, particularly on the technical scale, it was necessary to carry out extensive studies on the preparation and properties of the intermediates. Hear the part of this work is discussed which dealt with quaternary phosphonium compounds of trimethylcyclohexene derivatives.

ISSN:0570-0833    

DOI:10.1002/anie.196502871

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractA new synthesis of mucochloric acid by chlorination of butynediol has facilitated the preparation of a series of 4,5‐dichoropyridazones. The high reactivity of these compounds has been investigated and applied in several ways. New classes of compounds, some with biological activity, were obtained by displacement of the chlorine atoms. New heterocyclic systems were prepared by condensation and rearrangement reaction

ISSN:0570-0833    

DOI:10.1002/anie.196502921

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractVinylsulfonic acid and its derivatives can be prepared from β‐chloroethanesulfonyl chloride or carbyl sulfate (β‐hydroxysulfonyloxyethanesulfonic anhydride). The chemistry of vinylsulfonic acid has assumed industrial importance since the discovery of a simple synthesis of β‐chloroethanesulfonyl chloride from chloroethane or ethane, sulfur dioxide, and chlorine by the Reed process. Carbyl sulfate is as important a starting material as β‐chloroethanesulfonyl chloride, and surpasses the latter in some respects, e.g. on account of the low price of its components ethylene and sulfur trioxide. Vinylsulfonates undergo addition reactions with alcohols, phenols, thiols, sulfinic acids, carboxylic acids, amides, imides, and hydrazides, as well as with amines, ureas, diazonium salts, and nitroparaffins. Furthermore, they undergo halogenation, nitration, olefination, and the Diels‐Adler reaction. – Methods for the preparation of the free vinylsulfonic acid are described. Alkyl vinylsulfonates are excellent alkylating agents. The derivatives of vinylsulfonic acid are used e.g. as plasticizers, emulsifiers,

ISSN:0570-0833    

DOI:10.1002/anie.196503001

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractThe present paper deals with new cotton dyes, approaching the subject from two directions. In the first section the synthesis of a new type of reactive dye from products of Peppeacetylene chemistry is reported. The second part describes a dyeing process which does not stat with reactive dyes. Instead, the homopolar bonding between dye and cotton is formed by linking the dye to the substrate via polyfunctional bridges. These two programs have led to the development of the ®Primazin P and ®Basazol dye

ISSN:0570-0833    

DOI:10.1002/anie.196503121

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractMetal chelates can be used as initiators in the polymerization of vinyl compounds. Their action, as shown here for the polymerization of styrene, is determined by both the central atom and the ligand. Chelates of manganese (III) and cobalt (III) with 1,3‐dicarbonyl compounds are most effective. The metal chelate initiators can be activated by γ‐ or ultraviolet irradiation, or else by combination with cocatalysts such as organic halogen compounds or unsaturated hydrocarbons which are typical π‐complex formers. There is some evidence indicating that the polymerization takes place via a free‐radical mechanism. The central metal atom affects the steric configuration of the poly

ISSN:0570-0833    

DOI:10.1002/anie.196503221

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractA number of new catalyst systems based on transition‐metal compounds have been developed for the oligomerization and co‐oligomerization of butadiene. These catalysis promote dienylations and the formation of other CC linkages, and make possible the synthesis of new open‐chain and cyclic compounds from bu

ISSN:0570-0833    

DOI:10.1002/anie.196503271

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractThe formation of free radicals during the process of drawing of spun fibers was observed for the first time with two polyoxamides. The fibers turn red, and an ESR signal can be detected. Both, color and ESR absorption are not permanent. The decrease in the intensity of the ESR absorption and the change in the optical reflectance with time, as well as the dependence of the decoloration on temperature were investigated. The action of high‐energy radiation on the polyoxamides also leads to a red coloration and gives rise to ESR signals. It is concluded that the red color is due to free radicals associated with the oxamido grou

ISSN:0570-0833    

DOI:10.1002/anie.196503321

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractTetrahydro‐1,4‐oxazines with large alicyclic or long alkyl groupsCompounds of this type are the subject of German and other patent applications.attached to the nitrogen exhibit good or very good fungicidal activities against fungus diseases of crops, particularly against the true mildew varieties. ‐ By examining several hundred compounds, the relations between chemical constitution and fungicidal action were investigated in an attempt to find the most effective compounds. The factors varied were the nature, chain length, and ring size of the N‐substituent, and the nature, number, and positions of the C‐substituents on the heterocyclic system. Furthermore, the lone electron pair at the nitrogen atom was incorporated by alkylation, formation of amine oxides or salts, or by complexing with heavy metal salts, and the resulting changes in the fungicidal activity were d

ISSN:0570-0833    

DOI:10.1002/anie.196503361

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY