Dimethyldithiocarbamate, addition

Materials that promote the decomposition of organic hydroperoxide to form stable products rather than chain-initiating free radicals are known as peroxide decomposers. Amongst the materials that function in this way may be included a number of mercaptans, sulphonic acids, zinc dialkylthiophosphate and zinc dimethyldithiocarbamate. There is also evidence that some of the phenol and aryl amine chain-breaking antioxidants may function in addition by this mechanism. In saturated hydrocarbon polymers diauryl thiodipropionate has achieved a preeminent position as a peroxide decomposer. 

The lead-210 labelled chlorotrimethylplumbane was prepared by adding HC1 to the tetramethyllead-210 at 0 °C. The crude product was treated with the complexometric agent dimethyldithiocarbamate and the trimethyllead-210-DMDTC complex was purified by preparative TLC. Addition of HC1 to the pure lead-210 labelled Me3Pb-DMDTC complex yielded the desired lead-210 labelled Me3PbCl. 

Concerning the M=Co, bond, most of the reported examples result from inter- or intramolecular additions of anionic nucleophiles containing at least two reactive heteroatoms. Thus, sodium dimethyldithiocarbamate was found to react with the cationic allenylidene [RuTp(=C=C=CPh2)(PPh3)2] [PFg] (76) to generate the alle-nyl-metallacycle 77 (Scheme 26) as the result of the nucleophilic addition of one of the sulfur atoms at the Cq, carbon and subsequent coordination of the second sulfur to the ruthenium center, with concomitant release of a triphenylphosphine ligand [282]. Complex 77 could also be synthesized by treatment of the neutral derivative... 

Substituted benzo-l,3-dithiol-2-ones (315) are formed, together with products of type (316), in the reaction of sodium AyV-dimethyldithiocarbamates with l-chloro-2-nitroben-zenes (313) containing additional electron-withdrawing substituents (77JOC1265, 79JOC267). The intermediate dithiocarbamates (314) are not isolated. 

Ethoxyphenyl Tellurium Bis[dimethyldithiocarbamate] Perchlorate3 A suspension of 0.70 g (1.6 mmol) of 3,6-bis[dimethyliminio]-l,2,4,5-tetrathiane diperchlorate in acetonitrile is mixed in a beaker with 0.53g (0.36 ml, 1.0 mmol) of 4-ethoxyphenyl ethoxycarbonylmethyl tellurium. The mixture is kept at 20° for 12 h. The precipitate is collected by filtration. Water is added to the filtrate to precipitate additional product. The solids are combined, dissolved in acetonitrile by heating, and reprecipitated by addition of ethanol m.p. 191-193° (dec.). 

Fig. 6 Comparison between the number average molar mass and the relative amount of butanedioic acid in photo-oxidised polyethylenes containing different photoinitiators and stabilisers. The used additives were iron dimethyldithiocarbamate in SGI, iron dimethyldithiocarbamate and 0.8% carbon black in SG2 and iron dimethyldithiocarbamate and nickel dibutyldithiocarbamate in SG3...

Wastewater treatment facilities often use dithiocarbamates (DTCs) to remove heavy-metal contaminants (down to ppb levels) as DTCs form stable complexes with a wide variety of transition metals. We therefore investigated the ability of three commercially available DTCs to remove Cu from our process stream sodium dimethyldithiocarbamate (NaDMDTC, 129), sodium diethyldithiocarbamate (NaDEDTC, 130) and ammonium pyrrolidine dithiocarbamate (APDTC, 131). Upon addition of each DTC to the postcoupling reaction mixture, solid precipitates were observed that could easily be... 

Partition coefficients of nickel bis(dimethyldithiocarbamate) and bis(then-oyltrifluoroacetate) complexes between various organic solvents and aqueous perchlorate solution also show the effects of additional solvation, but this time probably at the metal atom, expanding the coordination number to six. " ... 

Polymerization is carried out at 5°C and is allowed to continue for about 12 hours until conversion reaches 60%. Reaction is then stopped by the addition of A, A -dimethyldithiocarbamate. Stripping and isolation operations are carried out as in the hot process. 

Another application field for sodium dimethyldithiocarbamate is the leather industry where it may be used to prevent the growth of bacteria in the soaking liquor and microbial damage to hides. Addition rates move between 0.05-0.1% of the solution containing 40-42% active ingredient. 

Thus sulfur vulcanization must be carried out in presence of additives that increase the rate and efficiency of the vulcanization process. The most widely used accelerators are derivatives of 2-mercaptobenzothiozole. Other frequently used accelerators are zinc dimethyldithiocarbamate and tetramethylthiuram disulfide. 

Tris(dithiocarbamate) complexes are readily oxidized (see below), however, upon addition of iodine only simple adducts, [Co(S2CNR2)3].2l2 (R = Me, Et R2 = C5H10, C4HgO), result. The dimethyldithiocarbamate complex has been... 

Related products include zinc dimethyldithiocarbamate (Methyl Zimate , RT Vanderbilt). This material, generally abbreviated as ZMDC, is a common additive in sulfur-vulcanized mbber compounds, and is often formed from other robber accelerators during the vulcanization process. It is less effective than the products listed above, but typically more permanent Dithiocarbamates typically darken on exposure to U V light. 

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