THE DECOMPOSITION OF DITHIOCARBAMATE FUNGICIDES, WITH SPECIAL REFERENCE TO THE VOLATILE PRODUCTS

1952 ◽  
Vol 30 (2) ◽  
pp. 131-138 ◽  
Author(s):  
L. E. Lopatecki ◽  
W. Newton
Keyword(s):  
Hydrogen Sulphide ◽  
Carbon Disulphide ◽  
Atmospheric Oxygen ◽  
Iron Salts ◽  
Volatile Products ◽  
Metallic Salts ◽  
Dithiocarbamic Acid ◽  
Basic Hydrolysis ◽  
Ethylene Thiourea ◽  
Sodium Diethyl Dithiocarbamate

The gaseous exchange accompanying decomposition of dithiocarbamate fungicides was measured in the Warburg manometer. Sodium diethyl dithiocarbamate decomposed under slightly acid conditions, producing carbon disulphide and a salt of diethylamine. The insoluble zinc and iron salts of dimethyl dithiocarbamic acid also decomposed in a similar fashion, but no carbon disulphide was given off from the more stable copper salt of this compound. The rate of decomposition of these metallic salts fell in the following decreasing order:[Formula: see text]Disodium ethylene bis-dithiocarbamate (nabam) decomposed under slightly acid conditions to produce approximately equal volumes of hydrogen sulphide and carbon disulphide, and presumably left a residue of ethylene thiourea. In distilled water, on the other hand, nabam underwent a slow basic hydrolysis and oxidation, with absorption of approximately two volumes of oxygen, and evolution of one volume of carbon disulphide. Apparently the sulphur fraction which is evolved as hydrogen sulphide from nabam under acid conditions is, under basic conditions, oxidized in solution by atmospheric oxygen to sulphate.

THE THERMAL DECOMPOSITION OF DIMETHYL DISULPHIDE

1954 ◽  
Vol 32 (8) ◽  
pp. 768-779 ◽  
Author(s):  
John A. R. Coope ◽  
W. A. Bryce
Keyword(s):  
Thermal Decomposition ◽  
Hydrogen Sulphide ◽  
Carbon Disulphide ◽  
Main Reaction ◽  
Methyl Mercaptan ◽  
Primary Reaction ◽  
Gaseous State ◽  
Dimethyl Disulphide ◽  
Volatile Products ◽  
Free Sulphur

The thermal decomposition of dimethyl disulphide has been studied in the gaseous state by a static method. The primary reaction, which follows a reproducible induction period, produces one mole of methyl mercaptan per mole of disulphide, together with a product of low volatility believed to be a thioformaldehyde polymer:[Formula: see text]There is also a competing reaction producing a large quantity of hydrogen sulphide. The remaining volatile products, hydrocarbons of two or more carbon atoms (believed to be chiefly ethylene), free sulphur, polysulphides, and carbon disulphide are formed either by the latter reaction or by the extensive decomposition of products. The decomposition is catalyzed by hydrogen sulphide, and more strongly by the complete reaction mixture. A mechanism is proposed for the main reaction.

scholarly journals Synthesis and antimicrobial activities of 1-(3-benzyl-4-oxo-3H-quinazolin-2-yl)-4-(substituted)thiosemicarbazide derivatives

2015 ◽  
Vol 80 (12) ◽  
pp. 1471-1479 ◽  
Author(s):  
Veerachamy Alagarsamy ◽  
Viswas Solomon ◽  
G. Krishnamoorthy ◽  
M.T. Sulthana ◽  
B. Narendar
Keyword(s):  
Methyl Ester ◽  
Carbon Disulphide ◽  
Dimethyl Sulfate ◽  
Acid Methyl Ester ◽  
Antimicrobial Activities ◽  
Dilution Method ◽  
Agar Dilution Method ◽  
Acid Methyl ◽  
Dithiocarbamic Acid ◽  
Thiosemicarbazide Derivatives

A series of 1-(3-benzyl-4-oxo-3H-quinazolin-2-yl)-4-(substituted) thiosemicarbazides (AS1-AS10) were obtained by the reaction of 2-hydrazino- 3-benzyl quinazolin-4(3H)-one (6) with different dithiocarbamic acid methyl ester derivatives. The key intermediate 3-benzyl-2-thioxo-2,3-dihydro-1Hquinazolin-4-one (4) was obtained by reacting benzyl amine (1) with carbon disulphide and sodium hydroxide in dimethyl sulphoxide to give sodium dithiocarbamate, which was methylated with dimethyl sulfate to yield the dithiocarbamic acid methyl ester (2) and condensed with methyl anthranilate (3) in ethanol yielded the desired compound (4) via the thiourea intermediate. The SH group of compound (4) was methylated for the favorable nucleophilic displacement reaction with hydrazine hydrate, which afford 2-hydrazino-3- benzyl-3H-quinazolin-4-one (6). The IR, 1H, and 13C NMR spectrum of these compounds showed the presence of peaks due to thiosemicarbazides, carbonyl (C=O), NH and aryl groups. The quinazolin-4-one moiety molecular ion peaks (m/z 144) were observed all the mass spectrum of compounds (AS1-AS10). Elemental (C, H, N) analysis satisfactorily confirmed purity of the synthesized compounds and elemental composition. All synthesized compounds were also screened for their antimicrobial activity against selective gram positive and gram negative by agar dilution method. In the present study compounds AS8 and AS9 were emerged as the most active compounds of the series.

Papers read to the Society, June 15, 1899

1900 ◽  
Vol 65 (413-422) ◽  
pp. 272-273
Keyword(s):  
Salt Lake ◽  
Atmospheric Oxygen ◽  
Electrical Energy ◽  
Tsetse Fly ◽  
Preliminary Note ◽  
Comparative Efficiency ◽  
Metallic Salts ◽  
Selective Death ◽  
Lord Kelvin

I. “A Comparison of Platinum and Gas Thermometers, including a Determination of the Boiling Point of Sulphur on the Nitrogen Scale: an Account of Experiments made in the Laboratory of the Bureau International des Poids et Mesures, at Sèvres.” By Dr. P. Chappuis and Dr. J. A. Harker. Communicated by the Kew Observatory Committee. II. “A Preliminary Note on the Morphology and Distribution of the Organism found in the Tsetse Fly Disease.” By H. G. Plimmer and J. Rose Bradford, F. R. S. III. “The Colour Sensations in Terms of Luminosity.” By Captain Abney, C.B., R.E., F. R. S. IV. “On the Orientation of Greek Temples, being the Results of some Observations taken in Greece and Sicily, in May, 1898.” By E. C. Penrose, F. R. S. V. “The Absorption of Rontgen Rays by Aqueous Solutions of Metallic Salts.” By Lord Blythswood and E. W. Marchant. Communicated by Lord Kelvin, F. R. S. VI. “On the Oxidation of Carbon at ordinary Temperatures by means of Atmospheric Oxygen with the Production of Electrical Energy.” By W. E. Case. Communicated by Sir William Preece, F. R. S. VII. “The Conductivity of Heat Insulators.” By C. G. Lamb and W. G. Wilson. Communicated by Professor Ewing, F. R. S. VIII. “On Simultaneous Partial Differential Equations and Systems of Pfaffians.” By A. C. Dixon. Communicated by Dr. J. W. L. Glaisher, F. R. S. IX. “On the Comparative Efficiency as Condensation Nuclei of Positively and Negatively charged Ions.” By C. T. R. Wilson. Communicated by the Meteorological Council. X. “Data for the Problem of Evolution in Man. II. A First Study of the Inheritance of Longevity and the Selective Death-rate in Man.” By Miss Mary Beeton and Professor Karl Pearson, F. R. S. XI. “Collimator Magnets and the Determination of the Earth’s Horizontal Magnetic Force.” By Dr. C. Chree, F. R. S. XII. “On the Resistance to Torsion of certain Forms of Shafting, with special Beference to the Effect of Iveyways.” By L. N. G. Filon. Communicated by Professor M. J. M. Hill, F. R. S. XIII. “On the Waters of the Salt Lake of Urmi.” By R. T. Gunther and J. J. Manley. Communicated by Sir John Murray, K.C.B., F. R. S. XIV. “On the Application of Fourier’s Double Integrals to Optical Problems.” By Charles Godfrey. Communicated by Professor J. J. Thomson, F. R. S. XV. “On Diselectrification produced by Magnetism. Preliminary Note.” By C. E. S. Phillips. Communicated by Sir William Crookes, F. R. S. XVI. “On the Orbit of the Part of the Leonid Stream which the Earth encountered on 1898, November 15.” By Dr. A. A. Rambaut. Communicated by Dr. G. J. Stoney, F. R. S. XVII. “On the Numerical Computation of the Functions G<sub>0</sub>(<italic>x</italic>), G<sub>1</sub>(<italic>x</italic>), and J<sub>n</sub>(<italic>x</italic> /<italic>i</italic>); and on the Boots of the Equation K<sub>n</sub>(<italic>x</italic>) = 0.” By W. Steadman Aldis. Communicated by Professor J. J. Thomson, F. R. S. XVIII. “Kesearches in Absolute Mercurial Thermometry.” By (the late) S. A. Sworn. Communicated by Professor H. B. Dixon, F. R. S.

PYROLYSIS OF ETHYL MERCAPTAN

1955 ◽  
Vol 33 (8) ◽  
pp. 1281-1285 ◽  
Author(s):  
Jean L. Boivin ◽  
Roderick MacDonald
Keyword(s):  
Hydrogen Sulphide ◽  
Carbon Disulphide ◽  
Optimum Temperature ◽  
Mass Spectral Analysis ◽  
Mass Spectral ◽  
Ethyl Mercaptan ◽  
Catalyst Metal ◽  
Free Sulphur ◽  
Carbonyl Sulphide ◽  
By Products

The decomposition of ethyl mercaptan to ethylene and hydrogen sulphide was studied at various temperatures, with and without a catalyst. Metal sulphides (copper, nickel, and cadmium) proved to be the most efficient catalysts for cracking ethyl mercaptan into unsaturated end products, the optimum temperature being 500–600 °C. When no catalyst was used a 40–50% yield of ethylene and a nearly quantitative conversion to hydrogen sulphide was observed between 600 and 700 °C. Other products identified in the exit gas were carbon disulphide, carbonyl sulphide, methane, hydrogen, ethane, thiophene, diethyl sulphide, and free sulphur. Identification of these products was aided by infrared and mass spectral analysis of the gas. A tentative mechanism for the reaction justifying the presence of the above by-products is outlined.

Influence of Conditions of Zinc Selenide Oxidation with Atmospheric Oxygen on the Composition of Volatile Products

2003 ◽  
Vol 76 (11) ◽  
pp. 1724-1727
Author(s):  
E. L. Tikhonova ◽  
P. E. Gaivoronskii ◽  
Yu. E. Elliev ◽  
E. M. Gavrischuk ◽  
S. M. Mazavin ◽  
...  
Keyword(s):  
Zinc Selenide ◽  
Atmospheric Oxygen ◽  
Volatile Products

scholarly journals THE REACTIONS OF ACTIVE NITROGEN WITH HYDROGEN SULPHIDE AND CARBON DISULPHIDE

1960 ◽  
Vol 38 (3) ◽  
pp. 334-342 ◽  
Author(s):  
R. A. Westbury ◽  
C. A. Winkler
Keyword(s):  
Nitrogen Atom ◽  
Hydrogen Sulphide ◽  
Temperature Effects ◽  
Carbon Disulphide ◽  
Third Body ◽  
Active Nitrogen

The destruction of either hydrogen sulphide or carbon disulphide by active nitrogen appears to be minimal at some temperature in the range 200–250 °C. Both reactions yield large amounts of polymer.It is postulated that the main reactions involve destruction of the reactant as it acts as a third body for recombination of nitrogen atoms. As the temperature is increased, dissociation of the nitrogen atom – reactant complex apparently increases. To account for the observed temperature effects, it is assumed that reactions also occur to regenerate reactant.

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