Thio-naphthol

NAPHTHALENE-2-THIOL (3-NAPHTHYL MERCAPTAN 2-NAPHTHYL MERCAPTAN 2-NAPHTHYL THIOL RENACIT 1 RPA 2 RPA NO. 2 THIO-NAPHTHOL THIO-13-NAPHTHOL P-THIONAPHTH-OL 2-THIONAPHTHOL USAF CY-4 VULCAMEL TEN... 

Methyl 2-naphthyl sulphide 2-Thio-naphthol methyl ether)... 

Dipping solution Dissolve 3 g 1-naphthol in 150 ml methanol and add 1350 ml water. Dissolve 0.5 g potassium disulfite (potassium metabisulfite) in this solution, add 20 ml glacial acetic acid and dissolve 0.5 g iron(II) sulfate THiO followed by 2.2 g N -ethyl-N -(2-methanesulfonamidoethyl)-2-methyl-l,4-phenylenediamine (sesquisulfate, monohydrate) (color developer 3, Merck). Care should be taken at each step that the solution has clarified before adding further components. 

Method A The glucopyranosyl bromide (1 mmol) in CH2C12 (10 ml) and HzO (10 ml) is added to the phenol (3 mmol) and TEBA-C1 or Adogen (0.2 mmol) in aqueous KOH or NaOH (25 mmol) and the mixture is stirred at room temperature for 8-60 h. The organic phase is separated, washed with H20, dried (MgS04), and evaporated to yield the O-aryl derivative (68% from phenol 60% from 2-cresol 53% from 3-chlorophenoI, 54% from 4-methoxyphenol 56% from 4-nitrophenol 57% from 1-naphthol 44% from thio-phenol 36% from 8-hydroxyquinoline). 

The reaction between selenium acetylacetone and thio-a-naphthol occupies an intermediate position between the reactions with hydriodie and hydrocyanic acids, the change being partly simple addition accompanied by depolymerisation, forming a-naphthylthioselenium acetylacetone, and partly in the direction of forming diselenium iisacetyl-acetone and aa-dinaphthyl disulphide, as shown in the scheme on page 86. 

Further bromination of 3,4,6-tribromo-5-hydroxybenzo[6]thio-phene affords the 2,3,4,6-tetrabromo derivative in the absence of acetate ion, and 3,4,4,6-tetrabromo-4,5-dihydrobenzo[6]thiophen-5-one in the presence of acetate ion. 421 On treatment of 3,4-dibromo-, 4,6-dibromo-, 3,4,6-tribromo-, or 2,3,4,6-tetrabromo-5-hydroxybenzo-[6]thiophene with nitric acid in acetic acid, the corresponding unstable orange crystalline 4-bromo-4-nitro-4,5-dihydrobenzo[6]thio-phen-5-one is obtained.152,421 Hence, once both positions ortho to the hydroxyl group in 5-hydroxybenzo[6]thiophene are occupied by bromine, the properties of these compounds are analogous to the properties of l-bromo-2-naphthol which, on bromination in acetic acid in the presence of acetate ion, affords l,l-dibromo-l,2-dihydro-naphthalen-2-one whereas, in its absence, it affords l,6-dibromo-2-naphthol.616 The behavior of l-bromo-2-naphthol and its derivatives on nitration is similar to that of 4,0-dibromo-5-hydroxybenzo[6]thio-phene and its derivatives.162,616... 

Few studies have attempted to relate catalytic activity to catalyst parameters. Ueda and Todo (47, 105) have developed a complex correlation between hydrodesulfurization of thio-/3-naphthol and paramagnetic species present on the catalyst. Their correlation involves Mo3+, Co2+, and a surface complex containing an organic species. 

Oxamyl (melhyl-N.N -dimethyl-N- [ (methyl-carbarn oyl)oxy] -1 -thio oxamidate) Plants including leaves, potato, tomato and wheat Ethyl acetate extraction of sample Addition of excess copper sulfate, back-titration with standard EDTA to 1 -(2-pyridylazo)2-naphthol [61]... 

There have again been a number of reports relating to the use of O2 in non-traditional environments. Thus the O2 oxidation of electron-rich substrates such as quinol, 1-naphthol and anthracene with bentonite-bound methylene blue and hydrotalcite-bound rose Bengal has been described. These clay-bound sensitizers have been recovered and reused up to three times with only a small loss in efficiency, and, it is claimed, are more stable with respect to bleaching. The fullerene-coated beads already described (Scheme 7) have been used to promote the conversion of 1-naphthol to 1,4-naphthoquinone. The conventional methylene blue sensitized oxidation of 3-bromo-2,5-bis-(thio)furans affords thiomaleates (Scheme 16) which have synthetic potential as dienophiles and Michael acceptors. The 3-bromo-2-thiofuran (105), in a similar fashion, gives a 4-oxobutanethioate whereas the 2,3-bis-(thio)furan (106) gives a y-butyrolactone. 

Peptizers are added to rubber at the beginning of mastication (see later) and are used to increase the efficiency of mastication. They act chemically and effectively at temperatures greater than 65°C and hasten the rate of breakdown of rubber chains during mastication. Common peptizers are zinc thiobenzoate, zinc-2-benzamidothiophenate, thio- 8-naphthol, etc. Processing aids other than the peptizer and compounding ingredients (additives) are added after the rubber attains the desired plasticity on mastication. 

Synonyms 2-Mercaptonaphthalene p-Mercaptonaphthalene Naphthalene-2-thiol p-Naphthalenethiol 2-Naphthalenthiol 2-Naphthyl mercaptan P-Naphthyl mercaptan 2-Naphthyl thiol Thionaphthol 2-Thionaphthol Thio-p-naphthol P-Thionaphthol... 

In a number of cases aromatic thioethers can be used for the stabilization of polyolefins however, in most cases their stabilizing effectiveness is low. Of llie best investigated compounds, diphenyl sulfide, phenyl-benzyl sulfide, di-/3-naphthyl sulfide, methyl-/ -naphthyl sulfide [41], sulfides of the thiophene series [28], etc., are known. In most cases amino- or phenol sulfides such as 2,2 -thio-bis-(4-methyl-6-tert-butyl-phenol), thio-bis-/3-naphthol, thio-bis-(N-phenyl-2-naphthylamine) [41], etc., are used. 

C18H2 5NOS, 2-t-Butylimino-X -thio-3,4-dihydro-3,3,5,8-tetramethyl-1(2H)-naphthalenone, 44B, 139 C19H16O3, 8-Benzoyl-5-ethoxy-1-naphthol, 44B, 139 Ci9H2o02f Di-O-methylsequirin-D, 44B, 140... 

Fig. 3.42 Effect of radical acceptor concentration on the degradation of thermally plasticized polystyrene (1) no radical acceptor (2) 1% thio-/y-naphthol (3) 2-3% thio-/f-naphthol [28].

Dimethyl disulfide traps organometallic species very effectively. For example, it converts the poorly soluble lithium 3-lithio-2-naphthoate into 3-methylthio-2-naphthol in 83% yield. Treated with the same reagent, iV,0-dilithiated ter/-butyl- -phenyl-carbamate furnishes the methyl sulfide in 89% yield. The smelly workup can be avoided if dimethyl disulfide is replaced by diphenyl disulfide, sulfur di-chloride, or di(benzenesulfonyl)sulfide. Particularly clean reactions are achieved with thio-A,A -diimidazole (83, Scheme 1-58). ... 

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