摘要:

AbstractThe title compounds were prepared from 2,4‐dioxohexahydro‐triazine (DHT) and the corresponding acid chlorides in the presence of sulphuric acid. They are active acylating agents against piperidine in dioxane as the solvent. Only the diacyl derivatives of DHT with acyl chain lengths up to C6react with aqueous solutions of sodium perborate forming the corresponding peroxy ac

ISSN:0021-8383    

DOI:10.1002/prac.19913330112

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY

ISSN:0021-8383    

DOI:10.1002/prac.19913330114

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY

摘要:

AbstractThe sensitized decomposition of p‐trimethylsilylbenzoylazide by aromatic ketones benzophenone, thioxanthone and 4,4′‐bis(dimethylamino)benzophenone (Michler's ketone) and by diphenylanthracene and pyrene was investigated.Excited benzophenone acts as producer of solvent radicals which attack the TSBA forming the substituted benzamide. Only short chain lengths are observed in the case of cyclohexane as solvent.Michler's ketone, diphenylanthracene and pyrene sensitize the decomposition of TSBA via electron transfer processes forming the substituted phenylisocyanate beside primary and secondary amides. The product ratio is dependent on the solvent properties.Reaction mechanisms are proposed which are founded on time resolved and stationary measurements of transient intermediates and quantum y

ISSN:0021-8383    

DOI:10.1002/prac.19913330115

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY

ISSN:0021-8383    

DOI:10.1002/prac.19913330116

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY

ISSN:0021-8383    

DOI:10.1002/prac.19913330117

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY

摘要:

Degradation of n‐Butylaminocyclohexyl phosphonic Acid di‐n‐Butylester (Buminafos) in Aqueous Medium.In aqueous medium, breakdown of Buminafos (1) is connected with total loss of its herbicidal activity. The phosphorus‐carbon bond is cleaved and n‐butylcyclohexylidene amine (3), cyclohexanone (5), phosphoric acid mono‐n‐butyl ester (4) (partly as n‐butylamine salt), and 1‐aminocyclohexyl phosphonic acid di‐n‐butylester (8) were found as degradation products of carbon‐14 labeled Buminafos. Identification was performed by MS, GC/MS,1H‐ and31P‐n.m.r. spectroscopy, by detection of phosphorus, and by

ISSN:0021-8383    

DOI:10.1002/prac.19913330118

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY

摘要:

Products of the Decarboxylation of Photochemically prepared Indenecarboxylic Acid Derivatives.4‐(2‐Diazo‐1‐oxo‐1, 2‐dihydro‐naphthalen‐5‐sulfonyl‐oxy)‐benzophenone (NQD‐BP) was photolyzed to form 4‐(3‐carboxy‐indene‐7‐sulfonyl‐oxy)‐benzophenone (ICA‐BP). This was decarboxylated base‐catalysed in ethanol leading to 4‐(indene‐4‐sulfonyl‐oxy)‐benzophenone (4) and 4‐(indene‐7‐sulfonyl‐oxy)‐benzophenone (5). The indene isomers were separated by means of preparative HPLC and their structure

ISSN:0021-8383    

DOI:10.1002/prac.19913330119

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY

ISSN:0021-8383    

DOI:10.1002/prac.19913330120

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY

摘要:

Spectroscopic Investigations on Organic Carbonyl Compounds. VI. N.M.R.‐Studies on Substitutedβ;‐Diketones and their Vinyloge Derivatives.13C‐ and1H‐n.m.r.‐data of substituted β‐diketones and their vinyloge derivatives are presented. Most of the compounds exist chiefly in the enol‐form. Only in the case of 4‐dimethyl‐aminodibenzoylmethane a keto‐enol‐equilibrium is registered. The influence of the substituent A and the chainlength on the position of the e

ISSN:0021-8383    

DOI:10.1002/prac.19913330121

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY

ISSN:0021-8383    

DOI:10.1002/prac.19913330122

出版商:WILEY‐VCH Verlag GmbH    

年代:1991

数据来源: WILEY