摘要:

AbstractThe isomerization of Allylbenzene, p‐allylanisole, 4‐phenylbut‐1‐ene and trans‐1‐phenylbut‐2‐ene catalyzed by various ruthenium, rhodium and iridium complexes has been investigated. At the boiling point of the olefins the reaction does not require co‐catalysts. The activity of the complexes studied decreases in the order Ru>Ir>Rh. PPh3and AsPh3increase the initial rates of the Rh (III), catalyzed reactions, decrease the activities of Rh (I)‐ and Ir (I)‐complexes and do not affect the Ru (II)‐compound. Different mechanisms for the rhodium‐ and ruthenium‐catalyzed i

ISSN:0021-2148    

DOI:10.1002/ijch.196900097

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

Abstract1,5‐Diphenyl‐1,3‐ and 1,4‐pentadienes were prepared and their geometrical isomers separated and characterized. The metalation of any of these compounds gave a single pentadienyl anion, to which an all trans conformation was assigned. The protonation of this anion yielded 1, 5‐diphenyl‐1,3

ISSN:0021-2148    

DOI:10.1002/ijch.196900098

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractIn order to obtain homogeneously sulfonated cation exchangers, the copolymers were sulfonated by oleum in a mixture of methylene‐chloride and nitromethane. The influences of the chemical interaction and of the diffusion process on the kinetic behavior of these systems were investigated, and it was shown that raising the temperature of the sulfonation mixture markedly increases the chemical reaction rate, while the effect on the diffusion is small. A curve‐fitting technique was used for the interpretation of the degree‐of‐sulfonation‐vs.‐time curves. These investigations served as guidelines for the subsequent preparation of homogeneous highly sulfonated

ISSN:0021-2148    

DOI:10.1002/ijch.196900099

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractThe two isomeric olefins, 1,2 and 1,4‐dihydronaphthalene, were subjected to autoxidation. Although rates as well as product patterns were entirely different for both olefins, it could be shown that an α‐peroxy radical is a common intermediate with both substrates. The difference in behaviour is caused by the fact that with the 1,4‐isomer chain propagation takes place by hydrogen abstraction, while addition to the reactive double bond occurs with the 1,2‐isomer. By cooxidation experiments of the two olefins a high conversion into an epoxide could be obtained, which was shown to be a reaction intermediate in the formation of β‐tetralone from the 1,2‐isomer. The products obtained on cobalt ion catalyzed oxidation were in agreement with the accepted mechanism for this reaction. The fact that attack by oxygen with both isomers occurs only at the α‐position is contrary to what could be expected on the basis of the thermodynamic stability of the products, but is in agreement with the recently proposed principle of least motion. With base catalysis almost exclusively the dehydrogenation product naphthal

ISSN:0021-2148    

DOI:10.1002/ijch.196900100

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractThe fragmentation pathways of tetrabenzoheptafulvalene and tetrabenzopentaheptafulvalene are discussed and compared with the fragmentation of tetrabenzofulvalene. In the corresponding systems in which the central bond is saturated (“dihydrofulvalenes”), electron impact causes fission of this bond. Some related compounds have also been investiga

ISSN:0021-2148    

DOI:10.1002/ijch.196900101

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

ISSN:0021-2148    

DOI:10.1002/ijch.196900102

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractThe reactions between iron carbonyls and the terpenes myrcene, alloocimene, and methyl levopimarate have been investigated. Nuclear magnetic resonance and mass spectra are reported for the newly prepared dieneiron tricarbonyl complexes.

ISSN:0021-2148    

DOI:10.1002/ijch.196900103

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

ISSN:0021-2148    

DOI:10.1002/ijch.196900104

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractThe use of geometrical isomerization of stilbene as a monitor of radiolytic excitation in methanolic solutions was evaluated using gas chromatographic analysis. No evidence for excitation of stilbene was obtained. The mechanistic significance of the observed isomerization of trans‐stilbene is obscured by the preponderant simultaneous formation of a veriety of other products. The cis‐stilbene used in this work was much less sensitive to ionizing radiation than its trans‐isomer, presumably because of efficient protection by a few percent of 2‐methylnaphthalene present as an i

ISSN:0021-2148    

DOI:10.1002/ijch.196900105

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractThe Raman spectra of crystalline hydrated normal and 80 atom%18O‐labelled sodium orthovanadates were investigated, the bands observed thus being assigned to their respective original modes of vibration. The Raman bands of the aqueous solutions of these vanadates, containing mainly the respective HVO4−2or DVO4−2ions, were also studied and in most cases observed to rise in frequency as a result of the18O‐labelling, as expected on the assumption that the hydrogen bonding between the solvating water molecules and the vanadate ions is weakened by18O‐labelling t

ISSN:0021-2148    

DOI:10.1002/ijch.196900106

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY