摘要:

AbstractThe synthesis and test results on the herbicidal and fungicidal activities of a large number of 2,1,3‐benzothiadiazoles, mainly 4,5,7‐trisubstituted derivatives, are described and discus

ISSN:0165-0513    

DOI:10.1002/recl.19670861102

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractA universal acidity scale, holding for solutions at any temperature and in any solvent, is developed. It is based on the operational pH‐definition and relates the measured pH‐values to the change in chemical potential on transferring a proton from solution X to a hypothetical solution of unit proton activity at 25° in water.This acidity scale is an extension of the universal pH‐scale for methanol‐water mixtures at 25° proposed by the authors1and is closely related to the universal acidity scale for water at different temperatures, proposed byAleksandrovandLebed'.2The disadvantage of the latter is that it does not lead to a simple, or easily applicable, physical significance of the measured

ISSN:0165-0513    

DOI:10.1002/recl.19670861103

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractThe universal pH‐scale in methanol‐water mixtures and in methanol is defined, in terms of the pHstvalues of standard buffer solutions in these solvents as well as in terms of the pHstvalues of aqueous standard buffer solutions and the values of Ej(H2O) ‐ Ej(S)/0.05916. The accuracy is satisfactory. (0.01 to 0.12 pH‐units in 0‐90% methanol and 0.27 pH‐units i

ISSN:0165-0513    

DOI:10.1002/recl.19670861104

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractFrom the results of the vapour pressure measurements described in previous communications of this series1and the determination of the compositions of the phases occurring in the different equilibria, the P‐T‐x space model for the binary system is derived. The P‐T and T‐x projections and the most important P‐x and T‐x sections are given. The thermodynamic constants of NbOCl3are derived also from the results of the measurements described

ISSN:0165-0513    

DOI:10.1002/recl.19670861105

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractThe kinetics of the desulfonation of benzenesulfonic and the isomeric toluenesulfonic acids have been studied at 120‐155° in 65‐85 wt‐% sulfuric acid with the aid of an inert gas (nitrogen) stripping technique. All reactions were found to be of the first order with respect to the initial sulfonic acid. At high temperatures and/or high sulfuric acid concentrations substantial isomerisation of the toluenesulfonic acids took place, especially at low nitrogen flow rates.The rate‐constants of the desulfonation step proper ‐i.e.the rate‐constants corrected for resulfonation ‐ increase with increasing acid concentration and temperature. The dependence of the rate of desulfonation on acidity is compatible with the sulfonation mechanism recently proposed byKortandCerfontain40, if the sulfonate anion is supposed to be the active substrate species in the desulfonation reaction.Partial rate‐factors for protodesulfonation of the toluenesulfonic acids and thetert‐butylbenzenesulfonic acids have been calculated. For a given alkyl substituentfo>fp>>fm. The protodesulfonation obeys the Selectivity Relationship. It is, therefore, suggested that the protodesulfonation of arenesulfonic acids in aqueous sulfuric acid proceedsviaa Wheland

ISSN:0165-0513    

DOI:10.1002/recl.19670861106

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractThree inorganic complexes of trimethylene sulfite (abbreviated tms)viz.Ni(tms)6(BF4)2, Co(tms)6(BF4)2and Co(tms)6(ClO4)2are reported. The analyses and X‐ray diffraction diagrams of the three isomorphous compounds are given.In Part V the diffuse reflectance spectra are reported for complexes of the following sulfoxides: diphenyl, methyl phenyl, dimethyl, tetramethylene and pentamethylene sulfoxide, and trimethylene sulfite. Remarkable differences are found in the spectrochemical parameters in the solid stat

ISSN:0165-0513    

DOI:10.1002/recl.19670861107

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractA study has been made of the chlorination of 1,4‐thioxane under varying conditions, yielding mono‐, di‐, tri‐ and tetra‐chloro derivatives (cf. Fig. 1). Inspection of the NMR spectra of the compounds and fractions isolated leads to the following generalisations:Substitution of chlorine takes place preferentially at a carbon atom adjacent to the sulfur atom and, up to three chlorine atoms, in one half of the ring. The use of peroxide catalysts favours substitution adjacent to the oxygen atom.Of the compounds studied the following were found to occur as a conformational equilibrium, the two (half) chair conformations both being present to a substantial percentage: thioxane, 3,3‐dichlorothioxane (IIb), 2,2,3,3‐tetrachlorothioxane (IVc), thioxene, 3‐chlorothioxene (Ib), 3,5‐dichlorothioxene (IId). Except for the last one these compounds show a similar A2B2‐system due to the four protons at the unsubstituted side of the molecule. Conformationally fixed compounds such as 3‐chlorothioxane (Ia),trans‐2,3‐dichlorothioxane (IIc) and 2,3,3‐trichlorothioxane (IIIb) show an ABCD pattern due to the four protons in the unsubstituted half. Dipole moments have been determined and have been used in the conformational

ISSN:0165-0513    

DOI:10.1002/recl.19670861108

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractIt is shown that prostaglandin E1is formed during autoxidation ofall‐cis8,11,14‐eicosatrienoic acid. However, the yield is low, which is due to the occurrence of many side reactions and the complex stereochemistry of the products. This non‐enzymic prostaglandin formation may give rise to artifacts in biological st

ISSN:0165-0513    

DOI:10.1002/recl.19670861109

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19670861110

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractUV and PMR spectra of 1‐methyl‐4‐phenylpyrazoles indicate the existence of conjugation between the phenyl and pyrazole rings. The UV spectra are found to be solvent dependent. This solvent effect can be explained, if considerable resonance interaction is as

ISSN:0165-0513    

DOI:10.1002/recl.19670861111

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY