摘要:

AbstractBase‐catalysed elimination‐addition reactions of ethylN‐(tosylmethyl)‐ or ethylN‐(α‐tosylbenzyl)‐carbamates and ‐thiocarbamates were carried out with secondary aliphatic amines, thiophenol, methanol or the carbamate itself as nucleophilic reagents. The reaction with sodium borohydride has been investiga

ISSN:0165-0513    

DOI:10.1002/recl.19670861202

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractProtonation of propionitrile‐15N leads to formation of the imino‐15N ethylcarbonium ion, which according to its NMR spectrum occurs in one configuration only. Chemical shifts and coupling constants have been determined at some temperatures.Line‐broadening measurements of the low‐field15N‐H doublet show that the deprotonation of the imino‐15N ethylcarbonium ion by fluoride anions in hydrogen fluoride‐boron trifluoride solution is diffusi

ISSN:0165-0513    

DOI:10.1002/recl.19670861203

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractThe crystal structure of alltrans‐diphenyloctatetraene has been refined. The C‐C bond lenghts from previous work were confirmed. The experimental bond lenghts are compared with the values calculated by the Hückel method both with constant and variable β, and with those calculated by the approximate SCMO method for three sets of parameters. The discrepancies between the best theoretical bond lengths and the experimental values need not be signif

ISSN:0165-0513    

DOI:10.1002/recl.19670861204

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractOn oxidation of 1‐methoxycyclopropanol1by ammoniacal cupric sulfate, methyl acrylate4aand dimethyl adipate3aare formed exclusively in high yield. It is shown that the latter compound is formed from the intermediate radical2by dimerisation and predominantly by addition to methyl acrylate. The same products and a tricarboxylic ester 8 are formed using ferric nitrate as the oxidant.1‐Methoxy‐2,2‐dimethylcyclopropanol10reacts with ammoniacal cupric sulfate to form the tetramethyladipic esters13and14as the main products and theα,β‐ andβ,γ‐unsaturated esters16and17in smaller quantities. These compounds originate from the radicals11and12.If the oxidation is carried out with ferric nitrate only radical12is produced, which is oxidised further yielding the unsaturated esters16and17and the β‐hydroxy‐ester18. The diversity of products obtained from the hemiacetal10and ammoniacal cupric sulfate, as compared with the ferric nitrate system, is ascribed to transient copper complexes which affect the transition state of the oxidation.With ferric chloride the hemiacetals1and10give the β‐chloro compounds9and19through an efficient ligand transfer oxidation of the inte

ISSN:0165-0513    

DOI:10.1002/recl.19670861205

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19670861206

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractIn continuation of earlier work, the reaction of 4,4‐dimethyl‐1‐phenylisochroman (1) with hydriodic acid and phosphorus was subjected to a closer investigation. 10, 11‐Dihydro‐10, 10‐dimethyl‐5H‐dibenzo[a,d]cycloheptene (2) and 9, 10‐dihydro‐9‐isopropylanthracene (4) were identified as the reaction products in a ratio 2:1. Fractionation of the reaction mixture afforded, among other products, anthracene as a pyrolysis product of compound4. A plausible reaction mechanism for the formati

ISSN:0165-0513    

DOI:10.1002/recl.19670861207

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractSome protonated nitroalkanes in HF‐BF3and HF‐SbF5solutions have been observed by NMR spectroscopy. The added proton on the NO2group absorbs at extremely low field (δ = 16.8‐17.5 ppm from TMS). This deshielding effect is probably caused by both the positive charge and the magnetic anisotropy of the NO2group. IR data show a parallel between RNO2H⊕‐RNO2and RCOOH‐RCOO⊖stretching absorptions. The thermal decomposition of protonated 2‐nitropropane is b

ISSN:0165-0513    

DOI:10.1002/recl.19670861208

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractThis paper reports the monoisotopic mass spectra of the compounds Ge(Alkyl)4, in which Alkyl = methyl, ethyl, propyl, butyl, pentyl and hexyl. With the aid of metastable ion transitions the fragmentation patterns could be given. With the exception of GeMe4these are all similar and can be explained by a few rules, the first being the tervalence of the Ge after primary ionization. In GeMe4splitting off of alkene fragments is difficult. As the alkyl chain length increases hydrocarbon ion abundance increases considerably.

ISSN:0165-0513    

DOI:10.1002/recl.19670861209

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractA series of 4‐alken‐5‐olides has been prepared by dehydration of the corresponding 5‐oxoalkanoic acids. These enollactones are sensitive to both oxygen and moisture.For the synthesis of 9cis‐dodecen‐5‐olide, 4‐heptynylmagnesium bromide was coupled with cyclopentanone to form 1‐(4‐heptynyl)cyclopentanol, which was oxidized to 5‐oxo‐9‐dodecynoic acid. Two‐step reduction and dehydration yielded the lactone. Similarly, 5‐oxo‐6‐dodecynoic acid, prepared from 1‐heptynylmagnesium chloride and glutaric anhydride, was converted into 6cis‐dodecen‐5‐olide.6cis‐Dodecen‐4‐olide was synthesized by coupling 2‐octynylmagnesium bromide with methyl 4‐oxobutanoate to give methyl 4‐hydroxy‐6‐dodecynoate; this was converted into 6‐dodecyn‐4‐olide, which was partially hydrogenated. The product was separated gas

ISSN:0165-0513    

DOI:10.1002/recl.19670861210

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractA number of phenyl‐substituted allyl anions and corresponding isoelectronic oxaallyl anions have been obtained by reacting phenyl‐substituted propenes, phenylacetaldehyde and benzyl methyl ketone with potassium amide in liquid ammonia.The NMR spectra of the anions are decribed. They yield information on the distribution of the negative charge and on the configurations. The configurational stability is also discus

ISSN:0165-0513    

DOI:10.1002/recl.19670861211

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY