Dimethyl chromium chloride

Di-pi-cyclopentadienylchromium. See Bis (cyclopentadienyl) chromium Di-pi-cyclopentadienyl cobalt. See Cobaltocene Dipias1 A. See Dibutyl phthalate Dipiast B. See Diisobutyl phthalate Dipiasi D. See Dioctyl adipate Dipiast E. See Di-n-heptyl phthalate Dipiast L8. See n-Dioc yl phthalate Dipiast N. See Diisononyl phthalate Dipiast O. See n-Dioctyl phthalate Dipiast R. See Diisodecyl phthalate Dipiast TM. See Tri-2-ethylhexyl trimellitate Dipiast TM8. See Trioctyl trimellitate Di (POE (4) lauryl ether) dimethyl ammonium chloride. See Dilaureth-4 dimonium chloride Di (POE (9) nonyl phenyl ether) citrate. See Dinonoxynol-9 citrate... 

Ammonium citrate tribasic Ammonium fluoborate Ammonium-12-molybdosilicate Ammonium phosphomolybdate Basic blue 9 Bromodichloromethane t-ButyIdimethylsilyl imidazole Chromium chloride (ous) Dimethyl acetamide Dimethyl formamide Ethoxydiglycol acetate Ethyl acetate Ethylbenzene Ethyl formate Ferric sulfate Formic acid Heptane Hexamethylenetetramine Isopropyl ether Methyl cyclohexane 2,7-Naphthalenediol ... 

Simple transition metal mercaptides, such as Ni(SR)2 or Hg(SR)2, are usually prepared by reactions not involving the thiolate anion as a nucleophile . Occasional use is made of thiolates, for instance in the preparation of chromium(iii) methanethiolate, where sodium methane-thiolate was reacted with chromium chloride in excess of dimethyl disulphide under dry nitrogen and irradiated to yield the desired product, which can also be prepared by other photochemical methods . Cobalt thiolates, [Co(SR)2]n, prepared from cobalt acetate in methanol... 

Both R and MMA radicals are found to be responsible for the photoinitiation process. Chaturvedi and coworkers [54,55] introduced phenyl dimethyl sulfonium-ylide cupric chloride and chromium thiophene carboxylate as the photoinitiator of styrene and MMA. No reaction mechanism was given for these systems. 

Dermal Effects. Skin irritation was noted in wildlife officers at the RMA after they handled sick or dead ducks without gloves (NIOSH 1981). Although the investigators concluded that diisopropyl methylphosphonate contributed to the local effects, a number of other compounds were present. Analysis of the pond water indicated the presence of a number of organic and inorganic contaminants, including diisopropyl methylphosphonate (11.3 ppm) aldrin (0.368 ppm) dieldrin (0.0744 ppm) dicyclo-pentadiene, bicycloheptadiene, diethyl benzene, dimethyl disulfide, methyl acetate, methyl isobutyl ketone, toluene, and sodium (49,500 ppm) chloride (52,000 ppm) arsenic (1,470 ppm) potassium (180 ppm) fluoride (63 ppm) copper (2.4 ppm) and chromium (0.27 ppm). Because of the presence of numerous compounds, it is unclear whether diisopropyl methylphosphonate was related to the irritation. 

All of the usual chromium-based oxidation reagents that have been used for the oxidation of cyclobutanols to cyclobutanones, for example, chromium(VI) oxide (Jones reagent),302 pyri-dinium chlorochromate,304 pyridinium dichromate,307 and chromium(YI) oxide/pyridine (Collins),303 are reported to do so without any serious problems. Alternatively, tetrapropylam-monium perruthenate in the presence of A-methylmorpholine A -oxide. oxalyl chloride in the presence of triethylamine in dimethyl sulfoxide (Swern),158,309,310 or phenyl dichlorophos-phate in the presence of triethylamine and dimethyl sulfoxide in dichloromethane (Pfitzner-Moffatt),308 can be used. The Pfitzner-Moffatt oxidation procedure is found to be more convenient than the Swern oxidation procedure, especially with respect to the strict temperature control that is necessary to achieve good yields in the latter, e.g. oxidation of 1 to give 2.308... 

There are two treatability groups of dissolved metals for chemical precipitation, complexed and non-complexed metals. Non-complexed metals can be removed by a direct precipitation with such a chemical as lime (Ca(OH) ), caustic (NaOH), sodium sulfide (Na2S), ferrous sulfide (FeS), or sodium carbonate (NajCOj). Complexed metals require coprecipitation with ferrous sulfate (FeS04), ferrous chloride (FeClj), or sodium dimethyl dithiocarbamate (DTC) in addition to a regular precipitant such as caustic or lime. Electrochemically generated ferrous ion is also effective in removing a wide variety of heavy metals, including hexavalent chromium. 

SAFETY PROFILE Poison by ingestion and inhalation. A corrosive irritant to skin, eyes (at 2 ppm), and mucous membranes. Potentially explosive reaction with chlorobenzene + sodium, dimethyl sulfoxide, molten sodium, chromyl chloride, nitric acid, sodium peroxide, oxygen (above 100°C), tetravinyl lead. Reacts with carboxylic acids (e.g., acetic acid) to form violently unstable products. Violent reaction or ignition with Al, chromium pentafluoride, diallyl phosphite + allyl alcohol, F2, hexafluoroisopropylideneaminolithium, hydroxylamine, iodine chloride, PbOa, HNO2, organic matter, potassium, selenium dioxide, sulfur acids (e.g., sulfuric acid. 

Other hazardous reactions may occur with carbon (e.g., soot, graphite, activated charcoal), dimethyl sulfoxide, ethylene oxide, chlorine, bromine vapor, hydrogen bromide, potassium iodide + magnesium bromide, chloride or iodide, maleic anhydride, mercury, copper(II) oxide, mercury(II) oxide, tin(IV) oxide, molybdenum(III) oxide, bismuth trioxide, phosphoms trichloride, sulfur dioxide, chromium trioxide. 

In contrast, the chemistry of the oxidation of a primary alcohol to an aldehyde differs sharply from the oxidation of an aldehyde to a carboxylic acid (case (b)). Advantage, in this case, must be taken of the difference in the mechanisms of these steps. Among the reagents which can effectively oxidize alcohols and remain rather inert toward aldehydes are pyridinium chlorochro-mate (a chromium trioxide-hydrogen chloride complex of pyridine) or dimethyl sulfoxide-Lewis acid. 

---