Bis dithiocarbamic

The utility of thallium(III) salts as oxidants for nonaromatic unsaturated systems is a consequence of the thermal and solvolytic instability of mono-alkylthallium(III) compounds, which in turn is apparently dependent on two major factors, namely, the nature of the associated anion and the structure of the alkyl group. Compounds in which the anion is a good bidentate ligand are moderately stable, for example, alkylthallium dicar-boxylates 74, 75) or bis dithiocarbamates (76). Alkylthallium dihalides, on the other hand, are extremely unstable and generally decompose instantly. Methylthallium diacetate, for example, can readily be prepared by the exchange reaction shown in Eq. (11) it is reasonably stable in the solid state, but decomposes slowly in solution and rapidly on being heated [Eq. (23)]. Treatment with chloride ion results in the immediate formation of methyl chloride and thallium(I) chloride [Eq. (24)] (55). These facts can be accommodated on the basis that the dicarboxylates are dimeric while the... 

Maneb 486 (Figure 25) is an ethylene bis-dithiocarbamate (EBDC) fungicide used in agriculture for the control of early and late blights in potatoes and tomatoes, as well as many other diseases in fruits, vegetables, field crops, and... 

Hylin, J.W. Oxidative decomposition of ethylene-bis-dithiocarbamates. Bull. Environ. Contam. Toxicol, 10(4) 227-233,1973. 

Sodium dimethyl dithiocarbamate/ disodium ethylene-bis-dithiocarbamate Moderate effectiveness in 3-8 hours against most bacteria 200 ppm of a 15% solution used weekly Stable under temperature and pH fluctuations reacts with dissolved iron to form a precipitate... 

The compound (562), which is important as an agricultural fungicide, is prepared by the aerial oxidation of ethylene bis(dithiocarbamate), and (563) results from the reaction of 1,3-dialkylimidazolidines with carbon disulfide. 

This response is absolute nonsense. Sweden had banned the herbicide amitrole and several bis-dithiocarbamate fungicides because of flawed scientific evaluations that misinterpreted thyroid tumors in rodents, known to lack relevance for humans, as indicators of a human risk associated with normal usage. In contrast to Sweden s action, IARC and the U.S. Environmental Protection Agency cleared all of them of suspicions of causing cancer at current exposure levels,45 and the EU has approved amitrole for general use. Sweden s Minister of the Environment, Kj ell Lars-son, has declared that Sweden will fight all the way to the European Court of Justice to stop reintroduction of these horribly dangerous pesticides. 

Cordier, M. (1954). Etude, du point de vue cenologique, des fungicide organique de synthese a base d ethylene-bis-dithiocarbamate de zinc. C. R. Acad. Agric. France 40, 243-246. 

Until about ten years ago, protectant foliar fungicides (such as ethylene bis-dithiocarbamates and phthalimides) and soil sterilants (such as vapam or methylbromide) were the only chemical means of controlling diseases caused by Oomycetes. These compounds are nonspecific biocides affecting many vital cell processes of both the pathogen and the host plant. This means that they are non-selective,... 

Tellurium bis[dithiocarbamates] are red, crystalline solids that are decomposed by base to tellurium and tellurite1. The tellurium atom and the four sulfur atoms from the two dithiocarbamate groups form a plane with the sulfur atoms located at the corners of a trapezoid2-5. 

Mixing aqueous solutions of alkali tellurapentathionate and sodium dithiocarbamates precipitates tellurium bis[dithiocarbamates]6-9. 

Tellurium bis[0-ethyl dithiocarbonate] dissolved in chloroform is converted to insoluble tellurium bis[dithiocarbamate] upon addition of solutions of sodium dithiocarbamates in methanol or ethanol3,4. 

When tellurium bis[(9-ethyl dithiocarbonate] was heated in methanol with sodium dithiocarbamates, tellurium bis[dithiocarbamates] were formed3. 

Tellurium tetrahalides and sodium dialkyldithiocarbamates (1 2 molar ratio) reacted in dioxane to form tellurium bis[dithiocarbamate] dihalides3,4. 

Tellurium bis[dithiocarbamate] diiodides reacted with sodium diethyldithiocarbamate to form tellurium tetrakis[diethyldithiocarbamate]1,2. 

Diorgano tellurium dihalides and alkali metal dithiocarbamates react to produce diorgano tellurium bis[dithiocarbamates]4 8. 

Diorgano tellurium bis[dithiocarbamates] are formed in metathetical reactions between diorganyl tellurium dibalides and sodium or ammonium dithiocarbamates3. 

Thermogravimetric investigations indicated that the diorgano tellurium bis[dithiocarbamates] decompose at 180° with loss of carbon disulfide. At 500° the residual mass corresponded to TeS1. 

According to a similar procedure, block copolymers are claimed to be pre- Mred by photodecomposition of bis-dithiocarbamates in the presence of an acrylic er to give a polymeric interm liate which is successively photodecomposed in the presence of another reactive monomer [149]. 

Although the bis(dithiocarbamate) complexes of Fe(II) are relatively unstable to air oxidation, early studies (12, 15) produced stable adducts of NO and CO. Both 5-coordinate [Fe(NO)(I dtc)2] and 6-coordinate [Fe(NO)2(R2dtc)2] complexes are known. There has been considerable interest in the mode of attachment of the NO molecule, as there are six possibilities (see Scheme 4). (A) and (B) represent valence-bond structures of the linear Fe-NO bond. Structure (C) involves a symmetric Fe-NO TT-bond. Structure D illustrates the bent mode of attachment, in which nitrosyl is coordinated to the metal through the nitrogen atom, but the Fe-NO bond-angle differs greatly from 180°. Structures (E) and (F) are valence-bond formalisms of an unsymmetrical, metal-NO 7r-bond. The structure of [Fe(NO)(R2dtc)2] (R = Me or Et) has been shown (230,231) to be square pyramidal, with four sulfur atoms in... 

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