The Reaction of Sulfur and Sulfur Compounds with Olefinic Substances. Part IX. The Reaction of Sulfur with 2,6-Dimethylocta-2,6-Diene

1958 ◽  
Vol 31 (5) ◽  
pp. 1065-1077
Author(s):  
L. Bateman ◽  
R. W. Glazebrook ◽  
C. G. Moore
Keyword(s):  
Infrared Spectrum ◽  
Sulfur Compounds ◽  
Formed Part ◽  
Time Of Reaction ◽  
Cyclic Sulfide

Abstract Farmer and Shipley showed that reaction of sulfur with 2,6-dimethylocta-2,6-diene (I) at 140° yields a cyclic monosulfide and a crosslinked polysulfide. No detailed investigation of the structures of these cyclic monosulfide or polysulfide products was undertaken, but it was deduced that the former contained 6-ethyl-2,2,6-trimethylthiaeyclohex-3-ene (VIII) and a compound having vinylidene unsaturation, CH2:CRR′, as apparently revealed by the infrared spectrum, and this has formed part of the evidence on which broad mechanistic conclusions have been based. This reaction has now been re-examined in greater detail; the compositions of the cyclic sulfide and crosslinked polysulfide fractions and their variation with time of reaction have been determined. Results and conclusions differing in important respects from those advanced by the earlier workers have been reached, as reported preliminarily elsewhere.

The Reaction of Sulfur and Sulfur Compounds with Olefinic Substances. VI. Factors Influencing Cyclic Sulfide Formation in the Reaction of Sulfur with Polyisoprenes

1949 ◽  
Vol 22 (4) ◽  
pp. 982-987
Author(s):  
George F. Bloomfield
Keyword(s):  
Reaction Times ◽  
Sulfur Compounds ◽  
Cross Linking ◽  
Secondary Products ◽  
Factors Influencing ◽  
The Cross ◽  
Time Of Reaction ◽  
Cyclic Sulfide

Abstract Cyclic sulfides are to a large extent secondary products of the reaction of primarily formed intermolecular polysulfides with polyisoprene hydrocarbon, and undue prolongation of the time of reaction of sulfur with polyisoprenes favors cyclic sulfide formation and so reduces the cross-linking efficiency of the sulfur. Various accelerating substances markedly increase the cross-linking efficiency, either by permitting shorter reaction times, or by promoting a cross-linking rather than a cyclizing reaction of the sulfur. Thiuram disulfide accelerators in the absence of sulfur bring about cross-linking, the linkages being of —C—S—C type rather than C—C.

The Reaction of Sulfur and Sulfur Compounds with Olefinic Substances VI. Factors Influencing Cyclic Sulfide Formation in the Reaction of Sulfur with Polyisoprenes

1950 ◽  
Vol 23 (2) ◽  
pp. 326-331
Author(s):  
George F. Bloomfield
Keyword(s):  
Reaction Times ◽  
Sulfur Compounds ◽  
Cross Linking ◽  
Secondary Products ◽  
Factors Influencing ◽  
The Cross ◽  
Time Of Reaction ◽  
Cyclic Sulfide

Abstract Cyclic Sulfides are to a large extent secondary products of the reaction of primarily formed intermolecular polysulfides with polyisoprene hydrocarbon, and undue prolongation of the time of reaction of sulfur with polyisoprenes favors cyclic sulfide formation and so reduces the cross-linking efficiency of the sulfur. Various accelerating substances markedly increase the cross-linking efficiency, either by permitting shorter reaction times to be employed, or by promoting a cross-linking rather than a cyclizing reaction of the sulfur. Thiuram disulfide accelerators in the absence of sulfur bring about cross-linking, the linkages being of C—S—C type rather than C—C.

The Reaction of Sulfur and Sulfur Compounds with Olefinic Substances. IV. The Thermal Decomposition of Organic Polysulfides, and Its Contribution to the Sulfur Olefin-Reaction

1949 ◽  
Vol 22 (2) ◽  
pp. 348-355
Author(s):  
George F. Bloomfield
Keyword(s):  
Thermal Decomposition ◽  
Major Part ◽  
Fission Products ◽  
Sulfur Compounds ◽  
Considerable Proportion ◽  
Elementary Sulfur ◽  
Cross Links ◽  
Organic Polysulfides ◽  
Cyclic Sulfide

Abstract At temperatures in the region of 140°, organic polysulfides undergo disproportionation resulting from thermal fission of S—S bonds and recombination of the fission products. In the presence of olefins a considerable proportion of the fission products become attached to ethylenic centers of the olefin, forming mixed mono- and polysulfides. The major part of the monosulfide product is fully saturated, hydrogen capture occurring during, or subsequent to the formation of adducts from the olefin and sulfurated fragments; unsaturation, however, appears in the polysulfide portion. The polysulfides are capable of producing monothio cross-links between the original olefinic molecules only in so far as they are able to yield up elementary sulfur to the olefin, and when the original olefin is a polyisoprene, the tendency towards the formation of a high proportion of intramolecular cyclic sulfide still further reduces the opportunity for formation of intermolecular sulfur-cross-linked products.

scholarly journals Synthesis, Identification, and Infrared Spectroscopy Study of the Influence of Reaction Parameters Variations on Cu(C4O4).2H2O Synthesis

2019 ◽  
Vol 35 (2) ◽  
pp. 849-`853
Author(s):  
Louiza Zenkhri ◽  
Salah Zenkhri ◽  
Ahmed Boutarfaia ◽  
Manel Bassa ◽  
Aziza Sedrati ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Infrared Spectrum ◽  
Comparative Study ◽  
X Rays ◽  
Spectroscopy Study ◽  
Spectral Measurements ◽  
Reaction Parameters ◽  
Experimental Conditions ◽  
Time Of Reaction ◽  
Ph Concentration

In this paper, we report synthesis, identification and study of different spectral measurements for Cu(C4O4).2H2O complex, in order to valorize effect of experimental conditions on resulting product nature. The structure was identified from a powder X rays diffraction. This complex was prepared for the first by Christian Rubel and Armin Weiss (1986). Comparative study for variation of different reaction parameters effect was interpreted by infrared spectrum observation for each product. In conclusion, we have put in evidence contribution effect of variation in temperature, pH, concentration, solvent, time of reaction on nature modification of the resulting product

Fourier transform infrared spectrum of 13C32S2 in the 3v3 band region

1996 ◽  
Vol 89 (4) ◽  
pp. 1145-1155
Author(s):  
JACQUES WALRAND ◽  
GHISLAIN BLANQUET ◽  
JEAN-FRANCOIS BLAVIER ◽  
HARALD BREDOHL ◽  
IWAN DUBOIS
Keyword(s):  
Fourier Transform ◽  
Infrared Spectrum ◽  
Fourier Transform Infrared ◽  
Band Region

The far infrared spectrum of H2O2 observed and calculated rotational levels of the torsional states : (n, τ) = (0, 1), (0, 3) and (1, 1)

1988 ◽  
Vol 49 (11) ◽  
pp. 1901-1910 ◽  
Author(s):  
F. Masset ◽  
L. Lechuga-Fossat ◽  
J.-M. Flaud ◽  
C. Camy-Peyret ◽  
J.W.C. Johns ◽  
...  
Keyword(s):  
Infrared Spectrum ◽  
Far Infrared

Sulfur compounds from the mushroom Boletus pseudocalopus and their bioactivity

Planta Medica ◽  
2012 ◽  
Vol 78 (11) ◽  
Author(s):  
CS Kim ◽  
KH Kim ◽  
SU Choi ◽  
KR Lee
Keyword(s):  
Sulfur Compounds

John Company Armed: The English East India Company, the Anglo-Mughal War and Absolutist Imperialism, c. 1675–1690

2018 ◽  
Vol 11 (1) ◽  
pp. 101-137 ◽  
Author(s):  
James M. Vaughn
Keyword(s):  
Seventeenth Century ◽  
South Asian ◽  
East India Company ◽  
Economic Conditions ◽  
Glorious Revolution ◽  
Mughal Empire ◽  
Imperial Expansion ◽  
English East India Company ◽  
Formed Part ◽  
The Glorious Revolution

During the 1670s and 1680s, the English East India Company pursued an aggressive programme of imperial expansion in the Asian maritime world, culminating in a series of armed assaults on the Mughal Empire. With important exceptions, most scholarship has viewed the Company's coercive imperialism in the later seventeenth century and the First Anglo-Mughal War as the results primarily, if not exclusively, of political and economic conditions in South Asia. This article re-examines and re-interprets this burst of imperial expansion in light of political developments in England and the wider English empire during the later Stuart era. The article contends that the Company's aggressive overseas expansion was pursued for metropolitan and pan-imperial purposes as much as for South Asian ones. The corporation sought to centralise and militarise the English presence in Asia in order both to maintain its control of England's trade to the East and in support of Stuart absolutism. By the eve of the Glorious Revolution, the Company's aggressive imperialism formed part of a wider political project to create an absolute monarchy in England and to establish an autocratic English empire overseas.

Excavation at Montfode Mount Motte, Ayrshire

1986 ◽  
Vol 13 (1) ◽  
pp. 78-85 ◽  
Author(s):  
Heather F James
Keyword(s):  
Recent Work ◽  
Aerial Photographs ◽  
Formed Part

Summary A two week excavation in two areas around the Scheduled Monument known as Montfode Mount confirmed the existence of the arcs of two outer concentric ditches noted on aerial photographs and an inner ditch at the base of the motte. There was no stratigraphical relationship between the outer ditches and the motte, and the excavation did not provide dating evidence for any of these features. While allowing for the fact that the outer ditches may be Medieval in date the excavator suggests that the ditches formed part of the defenses of a promontory fort of prehistoric date. In the light of recent work the interpretation of the mound as a motte is also discussed.

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