Manganese complexes carbonates

Nitroarenes are reduced to anilines (>85%) under the influence of metal carbonyl complexes. In a two-phase system, the complex hydridoiron complex [HFe,(CO)u]2-is produced from tri-iron dodecacarbonyl at the interface between the organic phase and the basic aqueous phase [7], The generation of the active hydridoiron complex is catalysed by a range of quaternary ammonium salts and an analogous hydrido-manganese complex is obtained from dimanganese decacarbonyl under similar conditions [8], Virtually no reduction occurs in the absence of the quaternary ammonium salt, and the reduction is also suppressed by the presence of carbon monoxide [9], In contrast, dicobalt octacarbonyl reacts with quaternary ammonium fluorides to form complexes which do not reduce nitroarenes. 

A rapid method of preparation of [Mn(NH20H)2Cl2] has been reported that is easily carried out and does not require the use of hydroxylamine. It involves treatment of manganese(ii) carbonate with hydroxylamine hydrochloride in boiling water. The complexes formed between Mn and tetramethyl- and tetraethyl-dithio-oxamide have been investigated by the Job method MnL3X2 (X = C10 or FeCl4 ) were observed. ... 

The metal-carbon chain in these complexes is either linear or deviates only slightly from linearity. The M=C=C angle varies between 173.5° and 180°, the various C=C=C angles between 172.3° and 180°. The deviation from linearity is most pronounced with the butatrienylidene manganese complexes [4, 5]. 

Analytical Chemical Data for Natural Waters. While elemental compositions of various natural waters usually can be determined with good reliability, analytical methods to distinguish between free and complex-bound species, oxidized and reduced forms, simple and polynuclear metal ion forms, and even between dissolved and colloidal or suspended phases are often lacking. Data on the nature and amounts of the individual substances which make up the total concentrations of organic material found in different natural waters are not yet extensive. These analytical deficiencies relate almost solely to the highly reactive, non-conservative elements—e.g., iron, manganese, phosphorus, carbon, nitrogen, aluminum, and other metal ions. 

In the case of the anionic manganese complexes, subsequent protonation affords the neutral alkylcarbene complexes. Intramolecular addition of deprotonated dppe to the a-carbon occurs on reaction of [Fe(=C=CMe2XdppeX C5H5)J+ with base [NaN(SiMe3)2 or KOH in tet-... 

Electrophilic attack on //-vinylidene complexes can occur either on the methylene carbon, or at the metal-metal bond. With the manganese complexes (45, R = H or Me), protonation affords the//-carbyne complexes (46), which in the case of R = Me, exist in the stereoisomeric forms shown (57). Interconversion of the two forms is slow at room temperature ... 

Photolysis of diethylthallium bromide in cyclohexane is a radical process involving cleavage of the thallium-carbon bond, which yields ethylcyclohexane and dicyclohexyl, as well as other products. Photoelectron transfer from benzyltributylstannanes to 10-methylacridinium ion results in cleavage of the metal-carbon bond, to give the corresponding benzyl radicals, rather than benzyl cations. Photochemical homolysis of Re- and Ru-alkyl bonds in Re(alkyl)-(CO)3(diimine) and Ru(I)(alkyl)(CO)2(diimine) complexes has been studied by Fourier transform ESR. In related manganese complexes, Mn(R)(CO)3(di-imine), elimination of CO is the predominant pathway when R = methyl, but Mn-alkyl homolysis occurs when R = benzyl. 

The cationic iron and manganese complexes 25 and 27 were similarly prepared by the reaction of the chloro- (24) or methoxy-substituted (26) cyclopropenylium ions with anionic carbon-ylferrate and manganate complexes. 

Since the distribution coefficients of PAN and its manganese complex are high, it is sufficient to extract the aqueous solution with only one portion of chloroform. Carbon tetrachloride, benzene, or isoamyl alcohol can be used as extractants. Only slight changes are observed in the value of A,max for the complex in the different solvents. 

OC, Carbon monoxide (Continued) cobalt, iron, osmium, and ruthenium complexes, 21 58-65 iron complex, 21 66, 68 manganese complexes, 23 34 molybdenum complexes, 23 4-9 niobium complexes, 23 34 palladium complex, 21 49 rhodium complexes, 23 124 ruthenium complex, 21 30 OCH4, Methanol, iridium complexes, 23 127 rhodium complexes, 23 127, 129 OCjHs, Acetone, compd. with carbonyltri-p.-chloro-chlorotctrakis-(triphenylphosphine)diruthcnium (1 2), 21 30... 

---