Rate of reaction of methyl iodide and hydrazine in aqueous solution

1969 ◽  
Vol 73 (2) ◽  
pp. 317-321 ◽  
Author(s):  
Robert A. Hasty
Keyword(s):  
Aqueous Solution ◽  
Methyl Iodide ◽  
Rate Of Reaction

The mechanism of the oxidation of thiocyanate ion by peroxomonosulphate in aqueous solution. II. Kinetics of the reaction

1966 ◽  
Vol 19 (8) ◽  
pp. 1365 ◽  
Author(s):  
RH Smith ◽  
IR Wilson
Keyword(s):  
Aqueous Solution ◽  
Initial Rate ◽  
Stopped Flow ◽  
Thiocyanate Ion ◽  
First Order ◽  
Conductance Method ◽  
Rate Of Reaction ◽  
Kinetics Of

Initial rates of reaction for the above oxidation have been measured by a stopped-flow conductance method. Between pH 2 and 3.6, the initial rate of reaction, R, is given by the expression R{[HSO5-]+[SCN-]} = {kb+kc[H+]}[HSO5-]0[SCN-]20+ka[H+]-1[HSO5]20[SCN-]0 As pH increases, there is a transition to a pH-independent rate, first order in each thiocyanate and peroxomonosulphate concentrations.

Remediation of Methyl Iodide in Aqueous Solution and Soils Amended with Thiourea

2004 ◽  
Vol 38 (4) ◽  
pp. 1188-1194 ◽  
Author(s):  
Wei Zheng ◽  
Sharon K. Papiernik ◽  
Mingxin Guo ◽  
Scott R. Yates
Keyword(s):  
Aqueous Solution ◽  
Methyl Iodide

Sulfur Linkage in Vulcanized Rubber. Reaction of Sulfur with 2-Methyl-2-Butene

1948 ◽  
Vol 21 (1) ◽  
pp. 14-26
Author(s):  
Milton L. Selker ◽  
A. R. Kemp
Keyword(s):  
Small Molecules ◽  
Methyl Iodide ◽  
Small Molecule ◽  
Three Dimensional ◽  
Model Systems ◽  
Basic Knowledge ◽  
Vulcanized Rubber ◽  
Dimensional Network ◽  
Rate Of Reaction ◽  
Definition Of

Abstract Year by year the complete definition of vulcanized rubber in terms of organic chemistry has become more desirable. The severity of the demands on rubber products makes it imperative to extend basic knowledge of vulcanization if we are to overcome the traditional defects or use limitations in this field. Chemical investigations of the vulcanization problem can be arranged into three lines of attack. In the first method the vulcanizate network is severed at various points by chemical or thermal means to liberate small portions of the material which can be studied as are small molecules. Ideally there should be no alteration of the linkages except where cutting of the chains takes place. Unfortunately no such “scissors” are known. Midgley, Henne, and Sheppard applied the thermal decomposition method to ebonite. Their study of the fragments, based on 1 per cent of the total material involved, was inclusive. Secondly, a small molecule reagent which swells the rubber may be used to penetrate the three-dimensional network and react with the various linkages in it. This method was used by Meyer and Hohenemser, who diffused methyl iodide into vulcanized rubber. This complicated reaction and its background with pure sulfur compounds were reported in the first two articles in the present series. The conclusions of this study were that the part of the combined sulfur which could be removed as trimethylsulfonium iodide was sulfide sulfur linked to a carbon atom alpha to a double bond. In most cases the less of this type of sulfur present, the higher the tensile strength of the vulcanizate. Methyl iodide was successful to a hitherto unattained degree because both its rate of reaction and products vary with the type of sulfur bond. This work left unanswered the question of the sulfur linkages which were not attacked by methyl iodide—in some cases the greater part of the combined sulfur. The third chemical line of attack is the study of model systems. A small molecule, such as an olefin, is reacted with sulfur and rubber-compounding ingredients; then, from identification of the products and study of the reaction, conclusions concerning vulcanizates are reached by analogy. The use of this method is old in chemical problems.

On the reaction of furan with bromine in aqueous solution. Observation of the slow hydration of malealdehyde

1983 ◽  
Vol 61 (9) ◽  
pp. 2171-2176 ◽  
Author(s):  
Oswald S. Tee ◽  
B. E. Swedlund
Keyword(s):  
Aqueous Solution ◽  
Rate Constant ◽  
Uv Spectrophotometry ◽  
Stopped Flow ◽  
Geometrical Isomers ◽  
Rate Of Reaction

The rate of reaction of furan with bromine in aqueous solution has been measured and the rate constant obtained by Williamson and Coller is confirmed. However, it is now found that the reaction of bromine with furan in water has two distinct stages: attack of bromine leading to the formation of malealdehyde 3 and hydration of 3 to a 2:1 mixture of the geometrical isomers of its cyclic hydrate 4. This second, slower process is observable by stopped-flow uv spectrophotometry occurring after the consumption of bromine. The observed kinetics are very similar to those recently found for the analogous hydration of phthalaldehyde by McDonald and Martin.

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