摘要:

The carbon-13 chemical shift of seventeen N-substituted 2,4,6-triphenyl pyridinium salts (TPP) and N-substituted 2,4,6-triaryl pyridinium (TsPP) salts have been determined.

ISSN:0038-7010    

DOI:10.1080/00387019108018167

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Third-derivative spectrophotometry, with zero-crossing technique of measurement, has been used for the determination of two-component mixture of allethrin and piperonyl butoxide with overlapping spectral bands. Beer's low was followed over the concentration ranges 10–25 and 10–40 ug ml−1of allethrin and piperonyl butoxide respectively.

ISSN:0038-7010    

DOI:10.1080/00387019108018168

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Residual dipolar coupling between carbons and14N nuclei in the13C CPMAS NMR spectrum of solid imidazole is studied. Calculations of expected splittings with a previously reported equation leads to the complete assignment of the solid state carbon chemical shifts. Additionally, information is provided on the location of14N electric field gradient axes at the N-H site.

ISSN:0038-7010    

DOI:10.1080/00387019108018169

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The 60 MHz1H NMR spectra of mexiletine, 1-(2,6-dimethylphenoxy)-2-propanamine,1, have been studied at 28° in CDCl3solution with the achiral reagent, tris(6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedionato) europium(III),2, Eu(FOD)3, and the chiral reagents tris[3-(trifluoromethylhydroxymethylene)-d-camphorato]europium(III),3, Eu(FACAM)3, and tris[3-(heptafluoropropylhydroxymethylene)-d-camphorato]europium(III),4, Eu(HFC)3. Substantial lanthanide-induced shifts were seen for the proton signals of1with each reagent. Appreciable enantiomeric shift differences were seen for both methyl signals and for each of the CH2CH proton signals using3and4that should permit direct determinations of enantiomeric excess for samples of1. A predominant conformation for1is suggested based on observed splittings of the CH2proton signals and their relative lanthanide-induced shifts.

ISSN:0038-7010    

DOI:10.1080/00387019108018170

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0038-7010    

DOI:10.1080/00387019108018156

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor