摘要:

AbstractAs a result of the interaction of hydrogen sulphide with 2‐methylbut‐2‐ene at temperatures of up to 240° and pressures of up to 115 atm., with tungstosilicic acid as catalyst, thiols, thioalkanes and polymers of 2‐methylbut‐2‐ene were obtained. A calculation of the equilibrium renders it extremely probable that, besides thiols, polymers can be formed.In the addition of hydrogen sulphide to hexadec‐1‐ene under the same conditions, only th

ISSN:0021-8871    

DOI:10.1002/jctb.5010040601

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

ISSN:0021-8871    

DOI:10.1002/jctb.5010040602

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractMukherjee's1preparation of ethyl α‐(4‐methyl‐3‐oxocyclohexyl)propionate has been improved. Condensed with 1‐diethylaminopentan‐3‐one this affords ethyl α‐(2:3:4:5:6:7:8:10‐octahydro‐1: 10‐dimethyl‐2‐oxo‐7‐naphthyl)propionate, the bromination‐dehydrobromination of which has been studied. 1‐Chloro‐ and 1‐diethylamino‐pent‐1‐en‐3‐one are described for the first time. Attempts to condense these compounds with 2‐methylcyclohexanone and with ethyl α‐

ISSN:0021-8871    

DOI:10.1002/jctb.5010040603

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractSix isomeric monoalcohols, believed to be intermediates in phenol—formaldehyde resin condensations, can be derived fromoo′‐, op′‐andpp′‐dihydroxydiphenylmethanes by treatment with formaldehyde. These have been prepared by methods that leave no doubt as to their structures.The general method of synthesis consisted in treating a brominated bromomethylphenol with a suitable phenolic ester. The resulting dinuclear ester was then hydrolysed to an acid which, after dehalogenation with Ni‐Al alloy in sodium hydroxide, was reduced with lithium aluminium hydride to the r

ISSN:0021-8871    

DOI:10.1002/jctb.5010040604

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe preparation of tetrabutyltin by a Wurtz reaction from stannic chloride, butyl chloride and sodium is described. To avoid losses of tin, due to the reduction of stannic chloride, a cyclic process is developed: instead of stannic chloride, dibutyltin dichloride is used as a starting material in the Wurtz reaction. The tetrabutyltin obtained is treated with stannic chloride to give dibutyltin dichloride, part of which has to be recycled.The disproportionation reaction used in the preparation of dibutyltin dichloride from tetrabutyltin and the chlorination of hexabutyldistannane, obtained as a by‐product in the Wurtz reaction, are briefly dealt wit

ISSN:0021-8871    

DOI:10.1002/jctb.5010040605

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractA new method is described for the preparation of ethyltin compounds, namely the interaction of a tin‐magnesium alloy of the composition Mg2Sn with ethyl bromide and chloride. This reaction yields tetraethyltin and/or various ethyltin bromides and chlorides. The type of solvent has an important influence on the course of the reactio

ISSN:0021-8871    

DOI:10.1002/jctb.5010040606

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe present paper gives an account of the results of a systematic investigation on the fungicidal properties of organo‐tin compounds. It is shown that among these compounds one structural type in particular exhibits a very high fungicidal activity. Within this type the influence on the activity of the nature of the various groups linked to tin has been investigated.The toxicity of organo‐tin compounds towards some other organisms is mentioned briefly.The final section deals with possibilities for practical applications of organo‐tin compounds as a consequence of their biocidal properties. From the results of laboratory tests the preservation of wood seems the most promising possib

ISSN:0021-8871    

DOI:10.1002/jctb.5010040607

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractPhotochemical chlorinations of alkylaromatic compounds, such as toluene, the xylenes, mesitylene etc., give the corresponding side‐chain polychloro‐derivatives, though some nuclear chlorination, and also the formation of viscous condensation products, may occur concomitantly. Replacement by chlorine of the side‐chain hydrogen of alkylperchlorobenzenes does not, in general, appear to proceed to completion. Attempts to obtain perchloro‐compounds by further chlorination in ultraviolet light cause fission of dichloromethyl groups and the formation of hexachloro

ISSN:0021-8871    

DOI:10.1002/jctb.5010040608

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe direct chlorination of aromatic hydrocarbons, in the presence of a ferric chloride‐iron catalyst, proceeds smoothly to give nuclear‐chlorinated derivatives. Methyl side‐chains are retained, but larger alkyl groups, such as ethyl,isopropyl andn‐butyl, readily undergo cleavage by chlorinolysis. Halogenated alkyl side‐chains, such as CCI3and C2Cl5, are usually not removed, though complete chlorination of the nuclei of compounds containing them cannot normally be achieved. In certain cases, one chlorine atom of a nuclear polychloro‐compound is susceptible to attack by a

ISSN:0021-8871    

DOI:10.1002/jctb.5010040609

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe effect of the type and amount of catalyst and the regime of heating on the determination of nitrogen in coal by a semi‐micro method, based essentially on that of Kjeldahl, has been investigated. Results obtained by the use of mercuric sulphate/selenium and vanadium pentoxide/selenium catalysts have been compared with those obtained by the standard macro‐method. A modified Markham distillation apparatus is described, and it is shown that by its use ‘blank’ corrections are considerably reduced. Estimates have also been made of the limits within which duplicate results should agree for both semi‐micro and macro‐methods and of the limits of error of the de

ISSN:0021-8871    

DOI:10.1002/jctb.5010040610

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY