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Dithiolation

HSCH2CH(0H)CH(0H)CH2SH. a useful water soluble reagent for preserving thiols in the reduced state, and for reducing disulphides quantitatively to dithiols. [Pg.145]

Two efficient syntheses of strained cyclophanes indicate the synthetic potential of allyl or benzyl sulfide intermediates, in which the combined nucleophilicity and redox activity of the sulfur atom can be used. The dibenzylic sulfides from xylylene dihalides and -dithiols can be methylated with dimethoxycarbenium tetrafiuoroborate (H. Meerwein, 1960 R.F. Borch, 1968, 1969 from trimethyl orthoformate and BFj, 3 4). The sulfonium salts are deprotonated and rearrange to methyl sulfides (Stevens rearrangement). Repeated methylation and Hofmann elimination yields double bonds (R.H. Mitchell, 1974). [Pg.38]

Recently, it has been reported that l,3-dithiole-2-thione (12) reacts with primary amine to give the corresponding thiourea and A-4-thia2oline-2-thione (Scheme 5) (14). 5-Methylenethiazolidine-2-thione (13) obtained from the reaction of propargyl amine and carbon disulfide... [Pg.372]

Although a variety of oxidizing agents are available for this transformation it occurs so readily that thiols are slowly converted to disulfides by the oxygen m the air Dithiols give cyclic disulfides by intramolecular sulfur-sulfur bond formation An example of a cyclic disulfide is the coenzyme a lipoic acid The last step m the laboratory synthesis of a lipoic acid IS an iron(III) catalyzed oxidation of the dithiol shown... [Pg.650]

Sucrose derivatives Sucrose 6,6y-dithiol Sucrose 6,6y-episulfide Sucrose esters... [Pg.941]

The tris (dithiolene) complexes of Mo can be formed by reaction of the corresponding dithiol and molybdate in acid solution. The intense green... [Pg.470]

More recendy, molecular molybdenum-sulfur complexes and clusters have been used as soluble precursors for M0S2 in the formulation of lubricating oils for a variety of appHcations (70). Presumably, the oil-soluble molybdenum—sulfur-containing precursors decompose under shear, pressure, or temperature stress at the wear surface to give beneficial coatings. In several cases it has been shown that the soluble precursors are trifunctional in that they not only display antifriction properties, but have antiwear and antioxidant characteristics as weU. In most cases, the ligands for the Mo are of the 1,1-dithiolate type, including dithiocarbamates, dithiophosphates, and xanthates (55,71). [Pg.477]

Generally, unsaturated compounds, eg, alkenes and natural fats and their derivatives, are much more reactive toward sulfur than alkanes. Sulfur reacts with unsaturated compounds at temperatures of 120—215°C, forming products that are usually dark and often viscous cross-linked mixtures of dithiole-3-thiones (eq. 4) (2) and sulfides (Table 1) (3). [Pg.206]

In the field, cassiterite ore is usually recognized by its high density (7.04 g/cm ), low solubiUty in acid and alkaline solutions, and extreme hardness. Tin in solution is detected by the white precipitate formed with mercuric chloride. Stannous tin in solution gives a red precipitate with toluene-3,4-dithiol. [Pg.60]

Esters derived from the primary alcohols are the most stable and those derived from the tertiary alcohols are the least stable. The decomposition temperature is lower in polar solvents, eg, dimethyl sulfoxide (DMSO), with decomposition occurring at 20°C for esters derived from the tertiary alcohols (38). Esters of benzyl xanthic acid yield stilbenes on heating, and those from neopentyl alcohols thermally rearrange to the corresponding dithiol esters (39,40). The dialkyl xanthate esters catalytically rearrange to the dithiol esters with conventional Lewis acids or trifluoroacetic acid (41,42). The esters are also catalytically rearranged to the dithiolesters by pyridine Ai-oxide catalysts (43) ... [Pg.363]

Double bonds in or diaLkylarnino groups on the alkyl group of the. -methyl ester may faciUtate isomerization to the dithiol ester (44). For example ... [Pg.363]

The reaction of toluene-3,4-dithiol(3,4-dimercaptotoluene) and antimony trichloride ia acetone yields a yeUow soHd Sb2(tdt)2, where tdt is the toluene-3,4-dithiolate anionic ligand (51). With the disodium salt of maleonitnledithiol ((Z)-dimercapto-2-butenedinitrile), antimony trichloride gives the complex ion [Sb(mnt)2] , where mat is the maleonitnledithiolate anionic ligand. This complex has been isolated as a yeUow, crystalline, tetraethyl ammonium salt. The stmctures of these antimony dithiolate complexes have apparendy not been unambiguously determiaed. [Pg.206]

C3S2 s s — — — l,2-Dithiolane-4-carboxylic acid 3-phenyl-l,2-dithiolylium iodide 4-methyl-1,2-dithiole-3-thione ... [Pg.9]

Active methylene compounds can add to 1,3-dithiolylium ions to give 2-substituted 1,2-dihydro-1,3-dithioles (206). Again, addition is often followed by oxidation (to 207). Alternatively, further addition can occur (to 208) (80AHC(27)151). In this reaction, (205) can be CH2(CN)2, CH2(COMe)2 or even MeCOMe. Somewhat similar reactions are shown by 1,3-diarylimidazolium ions. [Pg.67]

In the 1,2-dithiole series such imines are readily isolated they can be alkylated or protonated, e.g. (448) (449) (66AHC(7)39). [Pg.97]

Modification of reaction schemes leading to furans, thiophenes and pyrroles by incorporation of a heteroatom into the substrate provides ready access to imidazoles, thiazoles, oxazoles, dithioles, oxathioles, etc. Incorporation of two heteroatoms into the substrates... [Pg.112]

Use of the /3-thiodithiocarbonates (25) and acid results in ring closure to the 1,3-dithiol-2-one (26). Methyl, ethyl and isopropyl groups have been utilized in (25) (76S489), and when R = f-butyl, ring closure occurred in the presence of perchloric acid with extreme ease (74JOC95). Other variations of this synthetic route to 1,3-dithiole derivatives are described in Chapter 4.32. [Pg.114]

Phenyl-l,2,3-thiadiazole (513) as well as the 5-phenyl isomer (514) both lose N2 on photolysis. The 1,3-dithiole derivative shown was formed from both thiadiazoles (58LA(614)4). [Pg.159]

Thermolysis of the 1,2,3-thiadiazoles (545) in the presence of carbon disulfide leads to the thiocarbonyl carbene (546) adduct, the ring-fused l,3-dithiole-2-thione (547) (76JOC730). [Pg.162]

Alkylisothiazolium salts (61) undergo N—S bond cleavage when treated with hydrogen sulfide or thiophenol to form acyclic products (62), but 2-aryl compounds give 1,2-dithioles (63 or 64 Scheme 9) (75SST(3)54l, 77SST(4)339). [Pg.150]


See other pages where Dithiolation is mentioned: [Pg.145]    [Pg.328]    [Pg.749]    [Pg.338]    [Pg.1002]    [Pg.208]    [Pg.561]    [Pg.109]    [Pg.471]    [Pg.473]    [Pg.315]    [Pg.360]    [Pg.490]    [Pg.36]    [Pg.77]    [Pg.383]    [Pg.153]    [Pg.9]    [Pg.30]    [Pg.103]    [Pg.103]    [Pg.103]    [Pg.105]    [Pg.119]    [Pg.137]    [Pg.151]   
See also in sourсe #XX -- [ Pg.35 ]




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1,1-DithioIs 1.3- dithioles

1,1-Dithiolate ligands

1,2-Dicyanoethylene-1,2-dithiolate ligand

1,2-Dithiole-3-thione, methylation

1,2-Maleonitrile 1,2-dithiolate ligands

1,2-Maleonitrile 1,2-dithiolate ligands ligand structures

1,3,4-Thiadiazole-2,5-dithiol

1,3-Dithioles, mesoionic

1,3-Dithioles, oxidative coupling

1.1- Dithiolate derivatives, sulfur

1.1- Dithiolate derivatives, sulfur addition

1.1- Dithiolates, reaction chemistry

1.1- dicyanoethylene-2,2-dithiolate

1.2- Dithiol-3-imines, reaction with

1.2- Dithiol-3-ones

1.2- Dithiol-3-ones reaction with Grignard reagents

1.2- Dithiol-3-ones spectra

1.2- Dithiol-3-thiones

1.2- Dithiolanes 1.3- dithiols

1.2- Dithiole-3-oncs

1.2- Dithiole-3-ones, ring opening

1.2- Dithiole-3-thione, calculated vibrational

1.2- Dithiole-3-thiones

1.2- Dithiole-3-thiones 1.2- dithiolium salts

1.2- Dithiole-3-thiones and 1,2-dithiol

1.2- Dithiole-3-thiones and 1,2-dithiol-3-ones

1.2- Dithiole-3-thiones and 1,2-dithiol3-ones

1.2- Dithiole-3-thiones and l,2-dithiol-3-ones

1.2- Dithiole-3-thiones conductivity

1.2- Dithiole-3-thiones ketones

1.2- Dithiole-3-thiones metal complexes

1.2- Dithiole-3-thiones oxidation

1.2- Dithiole-3-thiones reactions

1.2- Dithiole-3-thiones reduction

1.2- Dithiole-3-thiones ring transformations

1.2- Dithiole-3-thiones spectra

1.2- Dithiole-3-thiones structure

1.2- Dithiole-3-thiones synthesis

1.2- Dithiole-3-thiones with benzyne

1.2- Dithiole-3-thiones with carbene precursors

1.2- Dithiole-3-thiones, reaction with

1.2- Dithioles

1.2- Dithioles dihydro

1.2- Dithioles hydrocarbons

1.2- Dithioles intermediates

1.2- Dithioles radicals from

1.2- Dithioles reaction with acetylenic esters

1.2- Dithioles special

1.2- Dithioles tautomerism

1.2- Dithioles, 3- photochemistry

1.2- Dithioles, intramolecular charge transfer

1.2- Dithiols cyclic

1.2- dithiol

1.3- Dithiol, 2,2-dibenzyl-4-phenyl

1.3- Dithiol-2-ylidene

1.3- Dithiol-4-olates

1.3- Dithiole-2-azide

1.3- Dithiole-2-iminium salts

1.3- Dithiole-2-phosphonates

1.3- Dithiole-2-thione

1.3- Dithiole-2-thione, chlorination

1.3- Dithiole-2-thione-4,5-dithiolato

1.3- Dithiole-2-thione-4,5-thiolate

1.3- Dithiole-2-thiones acetylene derivatives

1.3- Dithioles 1,1-dithiols

1.3- Dithioles 1.3- dithiolium salts

1.3- Dithioles 1.4- dithiafulvenes

1.3- Dithioles 2-alkoxy- from

1.3- Dithioles, 2- preparation, structure

1.3- Dithiols thietanes

1.3- Dithiols, oxidative cyclization

1.3- Dithole-2-thione-4,5-dithiolate anion vibration frequencies

1.3- dithiol-2-ylidene compounds

1.4- Dithiols dithiothreitol

1.4- Dithiols specials

13-Dipolar cycloaddition 1.2- Dithioles

13-Dithiolium - from 1.3- dithioles, 2-amino

2- -l,3-dithiols

2-thioxo-1,3-dithioles (also 1,3-dithiole

3,6-Dichlorobenzene-1,2-dithiolate

3-Alkylidene-l,2-dithioles

3-Imino-l,2-dithioles

3H -1,2-Dithiol-3-ones

3H-1,2-Dithiole

3H-l,2-Dithiole-3-thiones

3H-l,2-dithiol-3-thione

4,5-Dimercapto-1,3-dithiole-2-thione (dmit

4,5-Ethylenedithio-1,3-dithiole-2-thione

4,5-Ethylenedithio-l,3-dithiole-2-thione

4.5- Disulfanyl-l,3-dithiole-2-thionate

4.5- dicyano-l,3-dithiol-2-one

Acetonides to protect dithiols

Aldehydes dithiol acetals

Aldehydes reaction with dithiols

Alkene dithiolates

Arsen-1,1-dithiolates

Benzene Dithiol An Exemplary Case

Benzene dithiol

Benzene dithiol conductance

Benzo dithiol-3-thione

Benzo-1,3-dithiole-2-thiones

Benzo-1,3-dithiole-2-thiones reduction

Benzo-l,2-dithiole-3-thione

Benzo-l,3-dithiol-2-thione

Binaphthalene-2,2-dithiol

Bridge, dithiolate

Cadmium dithiol complexes

Cadmium dithiolate

Carborane-dithiolate ligand

Cobalt complexes 1.2- dithiolates

Cobalt complexes dithiolate

Copper complexes 1,1-dithiolates

Cyclic lead dithiolates, polymeric

Cyclopentadienyl dithiolate complexes

Dicyanoethene-1,2-dithiol

Dicyanoethylene dithiolate, isothiazoles

Diimines mixed-ligand diimine dithiolates

Diisocyanate Dithiol

Dimeric 1,1-dithiolate

Diorganotin dithiolates

Dithianes from dithiols

Dithiol catalysts

Dithiol complexes

Dithiol molecules

Dithiol-4-imines

Dithiolate

Dithiolate

Dithiolate complexes

Dithiolate complexes reactions

Dithiolate complexes structure

Dithiolate complexes substitution reactions

Dithiolate complexes sulfur-addition reaction

Dithiolate complexes with Lewis acids

Dithiolate diiron

Dithiolate ions

Dithiolate salt

Dithiolate-based Z-selective catalysts

Dithiolates

Dithiolates 1,2-dithiolate-type, structure

Dithiolates 4,5-dithiolato-1,3-dithiol-2-thione

Dithiolates flotation

Dithiolates formation

Dithiolates integral oxidation state

Dithiolates interactions

Dithiolates metal complexes

Dithiolates nomenclature

Dithiolates non-integral oxidation state

Dithiolates, geminal

Dithiolates, lithium complexes

Dithiolates, structure

Dithiole

Dithiole

Dithiole Carbene Reactions and Bi-l,3-dithioles

Dithiole Derivatives

Dithiole Series

Dithiole oxidative dimerization

Dithiole-2-ones

Dithiole-2-selenones

Dithiole-2-thionate ligands, “redox

Dithiole-2-thiones and Selenium-containing Analogues

Dithiole-2-thiones rearrangement

Dithioles and Related Compounds

Dithioles and Related Systems

Dithioles and dithiolanes

Dithioles reduction

Dithioles, synthesis

Dithiols

Dithiols

Dithiols aldehydes

Dithiols disulfides, cyclic

Dithiols ethanedithiol

Dithiols from alkenes

Dithiols from carbonyl compounds

Dithiols from disulfides

Dithiols from imines

Dithiols geminal

Dithiols ketones

Dithiols reaction with, phosgene

Dithiols, formation

Dithiols, from carbonyls

Dithiols, polydisulfides

Dithiols, protection

Dithiols, radical addition

Dithiols, reaction with lewisite

Electron 1,2-dithiolates

Ene-1,1-dithiols

Ene-l,2-dithiolates

Ethan-1,2-dithiol

Ethane-1,2-dithiol

Ethane-1,2-dithiolates

Ethers, reaction with dithiols

Ethylene-2,2-dithiolates

Gem-Dithiols

Gold complexes dithiolates

Heterocyclic and Heteroatomic Dithiolates

Hexane dithiol

I, 2-Dithiole-3-thione

Imino-l,2-dithiole

Iron dithiolate complexes

L,2-Dithiol-3 Ones

L,2-Dithiol-3-one, calculated vibrational spectra

L,2-Dithiole-3-thiones

L,2-dithiole-3-one

L,3-DITHIOLE-2-THIONE-4,5-DITHIOLATE

L,3-DITHIOLE-2-THIONE-4,5-DITHIOLATE SALTS

L,3-Dithiole-2-thione-4,5-dithiolate dmit)

Lead dithiolates

Lead dithiolates, cyclic—

Maleonitrile dithiolate

Manganese complexes dithiolates

Mercaptans dithiols

Mercury dithiol complexes

Metal dithiolates

Molybdenum complexes 1,1-dithiolate

Naphthalene-1,5-dithiol

Nickel dithiolate

O-Dithiols

Of dithiols

Oxidation of l,2-dithiole-3-thiones

Pedersen, C. Th., 1,2-Dithiole-3-thiones and

Platinum complexes alkene-1,2-dithiolates

Platinum diimine dithiolate

Preparation of a-(l,2-Dithiol-3-ylidene)carbonyl Compounds

Propane dithiol

Propane-1,3-dithiol, reaction with aldehydes

Pyridine-2,3-dithiol, reaction with 1-chloro2-nitrobenzene

Quinoxaline-2,3-dithiol

Quinoxaline-2,3-dithiol metal complexes

Quinoxaline-2,3-dithiolate dianion

Radical ring-opening with dithiols

Radicals Containing a 1,2-Dithiole Ring

S dithiolates

Selenium dithiolates

Silane-1,1-dithiolates

Silane-1,1-dithiolates and Tin Analogs

Silylated dithiols, with

Spiro[ 1,3-dithiol-2,9’-fluorene

TTF-dithiolate complexes

TTF-dithiolate ligands

Technetium complexes dithiol

Tellurium Dithiolates

Thieno -1,3-dithiole-2-thione

Thiol-groups Dithiols

Toluene dithiol complex

Toluene-3,4-dithiol

Toluene-3,4-dithiol metal complexes

Toluene-3,4-dithiolate

Triazine dithiol

Vanadium complexes dithiolates

Vicinal dithiols

Zinc dithiol

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