Dibenzyldithiocarbamate

There is an industry trend to supply SBR certifiably free of volatile nitrosamines or nitrosatable compounds. This has generally been accomplished by replacing shortstop systems based on carbamates and hydroxyl amines with products that are not based on secondary amines or are secondary amines of high molecular weight, such as dibenzyldithiocarbamate. A more recendy issued patent for ESBR shortstop is based on isopropyUiydroxylamine, a primary amine that does not form nitrosamine (46). 

Konarev DV, Kovalevsky AY, Otsuka A, Saito G, Lyubovskaya RN (2005) Neutral and ionic complexes of Cgo with metal dibenzyldithiocarbamates. Reversible dimerization of Ceo" in ionic multicomponent complex [Cr (C6H6)2" ] (C6o ) 0.5[Pd(dbdtc)2]. Inorg Chem 44 9547-9553... 

Sodium dibenzyldithiocarbamate [55310-46-8] M295.4, m 230°(dec). The free acid when recrystd twice from dry Et2O has m 80-82°. The Na salt is reppted from aqueous EtOH or EtOH by addition of Et2O or Me2CO [AC 50 896 7975]. The NH4 salt has m 130-133° Cu salt (yellow crystals) has m 284-286° and the Ti salt has m 64-70°. 

A survey of the extractables present in rubber teats was published in 1991. The samples were extracted with diethyl ether or acetone and the extracts analysed by GC and GC-MS. Data was obtained on 49 rubber teats commercially available in Holland and a number of compounds not permitted in the Dutch regulations were identified, including dibenzylamine, acetophenone, zinc dibenzyldithiocarbamate, 4,4 -thio-bis(2-tert-butyl 5-methyl)phenol and bis(2-hydroxy-3-tert-butyl 5-ethylphenyl)methane. 

Method II the copper content is colorimetrically measured after reaction with Zn dibenzyldithiocarbamate using a spectrophotometer at 438 nm. 

Bismuth has been determined with the use of zinc dibenzyldithiocarbamate (CCI4, e = 1.2-10, at 370 nm) [17,18], lead tetramethylenedithiocarbamate [19], and pyrrolidine-dithiocarbamate [20]. 

Zinc dibenzyldithiocarbamate (formula 19.1), which is soluble in CCI4 and CHCI3, is less selective than Pb(DDTC)2 but more resistant to highly acidic media [20]. With this reagent, copper can be extracted from 1-2 M HCl or H2SO4. Lead dibenzyldithiocarbamate has been used similarly [21]. 

The diethyldithiocarbamate copper complex is unstable in acid medium and is light-sensitive. Dibenzyldithiocarbamate (avaUable as zinc salt) lacks these disadvantages moreover, it is more sensitive (Table 1) and more specific (M13, S3). Maytum et al. (M17) and most recently Giorgio et al. (G5) have described methods for urinary copper determination with this reagent. The latter method does not require preliminary ashing. The only disadvantage of these methods is the use of carbon tetrachloride, which is potentially toxic. 

Akrochem Z.B.E.D Arazate (T-4)-Bis(bis(phenyl-methyl)carbamodlthioato-S,S )zinc Dibenzyidithiocarb-amic acid, zinc salt EINECS 238-778-0 Naftocit ZBEC Octocure ZBZ-50 Perkacit ZBEC Vulkacit ZBEC ZBeDC Zinc, bis(bis(phenylmethyl)carbamodithioato-S,S )-, ((3-4)- Zinc bis(dibenzyldithiocarbamate) Zinc dibenzyidithiocarbamate. 

Perkacil ETU. See Ethylene thiourea Perkacil MBS. See ISI-Oxydiethylene benzothiazole-2-sulfenamide Perkacil MBT. See 2-Mercaptobenzothiazole Perkacil MBTS. See Benzothiazyl disulfide Perkacil NDBC. See Nickel dibutyidithiocarbamate Perkacil SBEC. See Sodium dibenzyldithiocarbamate Perkacil SDBC. See Sodium di-n-butyl dithiocarbamate Perkacil SDEC. See Sodium diethyidithiocarbamate Perkacil SDMC. See Sodium dimethyidithiocarbamate Perkacii TBBS. See Butyl 2-benzothiazole sulfenamide... 

Sodium dibenzyldithiocarbamate 55335-06-3 Triclopyr 55353-19-0 Polyquaternium-10 55353-21-4 Resyn 28-2913 Resyn 28-2930... 

Table 1.11 The analysis of polymer digests by dibenzyldithiocarbamate precipitation - energy-dispersive x-ray spectrometry and electrothermal atomisation atomic absorption spectrometry ...

Separation and pre-concentration. A method first suggested by Knapp et al. (1975), developed further by Prange (1983) for seawater analysis using TXRF and later slightly modified by Schmidt et al. (1993) combines matrix removal with enrichment by a factor of about 50. The elements V, Mn, Fe, Co, Ni, Cu, Zn, Se, Mo, Cd, Pb and U are chelated using sodium-dibenzyldithiocarbamate (Na-DBDTC). The water-insoluble chelates are adsorbed on a column of a reversed-phase silica gel. Alkaline and alkaline earth elements elute unchelated with the aqueous phase and are discarded. The chelate complexes are removed from the dried column with a mixture of chloroform and methanol (methanol is needed for the quantitative elution of Mo). Some 100/tL of this extract are evaporated on quartz sample carriers and measured for around 1000 s. 

The buffer solution is prepared according to Section 12.4.2.4-Reagents. A solution is prepared of 400 mg of sodium dibenzyldithiocarbamate in 10 g of methanol. The solution can be stored, if cooled, for 1 or 2 days. A 2+1 (v v) mixture is prepared of CHQ3 and CH3OH. A dilution of a metal standard solution (e.g., 10mg/L Co) is prepared. 

Sodium-dibenzyldithiocarbamate (Na-DBDTC) tends to precipitate as carbamic acid at pH levels less than 4.8. Introduced into the column it accumulates at the column on its top and later redissolves in the CHCls CHsOH mixture, resulting in poor sample spots on the carrier. This leads to a large background signal and deterioration of the detection limits. Low lead and cadmium concentrations in open ocean water can be difficult or impossible to detect under such conditions. Thus, precipitation of carbamic acid must be avoided. 

N-methyl-N-phenyldithiocarbamic acid N-ethyl-N-phenyldithiocarbamic acid N-isopentyl-N-phenyldithiocarbamic acid N,N-dibenzyldithiocarbamic acid N-methyl-N-benzyldithiocarbamic acid N-ethyl-N-benzyldithiocarbamic acid N-propyl-N-phenyldithiocarbamic acid N-isopropyl-N-phenyldithiocarbamic acid N-methyl-N(4-tolyI)dithiocarbamic acid N-ethyl-N(4-tolyl)dithiocarbamic acid N-ethyl-N-l-naphthyldithiocarbamic acid... 

A 0.1 % solution of lead dibenzyldithiocarbamate can also be used as reagent. 2... 

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