摘要:

AbstractSome new derivatives ofmeta‐di‐tert‐butylbenzene are described. The rates of deacetylation of a number of such derivatives are briefly disc

ISSN:0165-0513    

DOI:10.1002/recl.19670860102

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractBy treating 4‐chloro‐2‐phenylpyrimidine‐4‐14C with potassium amide in liquid ammonia, labelled 4‐methyl‐2‐phenyl‐s‐triazine was obtained. By degradation of thiss‐triazine derivative by acid hydrolysis, the14C‐label was found to be present in one position only,viz. position 4. This result strongly indicates that in this ring‐transformation no bicyclic intermediates are involved and that the opening of the pyrimidine ring occurs by fission of the C(5)C(6)bond and not of the C(4)C(5)bond. The mechanism

ISSN:0165-0513    

DOI:10.1002/recl.19670860103

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractProton magnetic resonance spectra of ethynylphosphines, ethynylphosphine oxides and their saturated analogues have been measured. An analysis of the data indicates the presence of 3d‐orbital participation in the PC bond. This participation seems to be equal in the phosphines and the phosphine o

ISSN:0165-0513    

DOI:10.1002/recl.19670860104

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19670860105

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractAccording to the theory of long‐range proton spin coupling by pi electrons, |JHH| in acetone should decrease with increasing polarity of the carbonyl group. Experimentally the opposite has been found. To explain the observed trend a “through‐space” mechanism is proposed.JHHis now interpreted as the result of a negative coupling by the pi electrons and a positive “through‐space” contribution. On this hypothesis a better fit numerically can als

ISSN:0165-0513    

DOI:10.1002/recl.19670860106

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractThe synthesis of some terthienyls using 1,2‐ and 1,4‐ diketones as precursors, is described. Most of the 1,4‐diketones are prepared by the Stevens rearrangement ofN,N‐di(2‐thenoylmethyl)‐N,N‐dimethylammonium salts followed by elimination of dimethylamine and reduction of the resulting 2‐butene‐1,4‐diones.Of the fourteen possible isomeric terthienyls only four were known prior to this work. Using the methods described two new isomeric systems

ISSN:0165-0513    

DOI:10.1002/recl.19670860107

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractSubstituents with electron withdrawing capacities are found to induce a paramagnetic displacement of the chemical shifts of protons and methyl groups in the remaining positions of the pyrazole ring. For the 4‐position this effect is considered to be due primarily to resonance interaction of substituent and pyrazole rin

ISSN:0165-0513    

DOI:10.1002/recl.19670860108

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractTransport through a polyelectrolyte membrane in aqueous binary electrolyte solutions is described by six constants, either six permeabilities Lik(with i, k = 1, 2, 3, including i = k) or friction coefficients fik(with i, k = 1, 2, 3, 4; i ≠ k). In a porous, selective membrane the friction of the co‐ion with the polymer matrix can be neglected, whereas the molecular friction coefficient of small ions and solvent approaches its free solution value. The required experimental information reduces to three independent measurements, for which electro‐osmosis, conductivity and co‐ion diffusion may be taken. A check on the fikvalues thus calculated is provided by expressing the ratio of electric transference numbers in friction quantities and comparing with experiment. The proposed device does not involve concentration averages; it is shown to be compatible with experiment

ISSN:0165-0513    

DOI:10.1002/recl.19670860109

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractThe sequence of the amino acids in a peptide covalently bound to a polymer could be determined by reaction with methyl isothiocyanate. This extension of the Edman degradation is likely to facilitate the automation of the sequence determination of peptides and proteins.

ISSN:0165-0513    

DOI:10.1002/recl.19670860110

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractThe preparation of fifteen derivatives of 2‐tert.butylbenzoic acid, substituted in the aromatic nucleus in the 4‐ or the 5‐position, and of a 4,5‐disubstituted 2‐tert.butylbenzoic acid is

ISSN:0165-0513    

DOI:10.1002/recl.19670860111

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY