Manganous acetate

The present research was focused on the study of acetaldehyde oxidation rising air with aqueous mangan acetate catalyst in mechanically stirred tank reactor. 

Such a pre-equilibrium closely parallels that suggested by Dewar et for the manganic acetate oxidations of several aromatic ethers and amines (p. 405). Other features of the reaction are a p value of —0.7 and identical activation energies of 25.3 kcal.mole for oxidation of toluene, ethylbenzene, cumene, diphenylmethane and triphenylmethane. 

Cremonesi P, EL Cavalieri, EG Rogan (1989) One-electron oxidation of 6-substituted benzo(a)pyrenes by manganic acetate. A model for metabolic activation. J Org Chem 54 3561-3570. 

Manganous acetate (4H2O) [6156-78-1 ] M 245.1. Crystd from water acidified with acetic acid. 

Commercially available Mn(OAc)3 2H20 has been used for most oxidative cyclizations. This reagent can also be prepared easily from potassium permanganate and manganous acetate in acetic acid [1], Anhydrous Mn(OAc)3 is slightly more reactive than the dihydrate. Reaction times with the anhydrous reagent are usually somewhat shorter but the yields of products are usually comparable. Both tri-fluoroacetic acid and potassium or sodium acetate have been used with Mn(OAc)3. 

Kooyman et a/.232-234 showed that no direct reaction between the arene and Mn(IIl) occurred in the manganic acetate oxidation of benzene, chlorobenzene, and toluene in acetic acid. Products were satisfactorily explained by the participation of carboxymethyl radicals as intermediates analogous to those formed in the manganic acetate oxidation of olefins [see Section II.B.3.a]. Substituted... 

The checkers used manganous acetate tetrahydrate obtained from Fisher Scientific Company. This compound is more readily available than manganous acetate dihydrate used by the submitters and obtained from the Harshaw Chemical Company. 

This method has the advantage that it does not require the preparation and purification of solid manganic acetate dihydrate. Dehydration by various ratios of acetic anhydride to manganese shows that in this procedure the yield (35%) from the monohydrate is greater than that from the manganic acetate dihydrate. Further removal of all water from the manganic acetate by means of acetic anhydride does not improve the yield (66%). 

A wide variety of substituted y-butyrolactones can be prepared directly from olefins and aliphatic carboxylic acids by treatment with manganic acetate. This procedure is illustrated in the preparation of 7-( -OCTYL)-y-BUTYROLACTONE. Methods for the synthesis of chiral molecules are presently the target of intensive investigation. One such general method developed recently is the employment of certain chiral solvents as auxiliary agents in asymmetric synthesis. The preparation of (S.SM+H, 4-BIS(DIMETHYLAMINO)-2,3-DIMETHOXY-BUTANE FROM TARTARIC ACID DIETHYL ESTER provides a detailed procedure for the production of this useful chiral media an example of its utility in the synthesis of (+)-(/ )-l-PHENYL-l-PEN-TANOL from benzaldehyde and butyllithium is provided. 

SYNS ACETIC ACID MANGANESE(II) SALT (2 1) DIACETYLMANGANESE MANGANESE(2+) ACETATE MANGANESE(II) ACETATE MANGANESE DIACETATE MANGANOUS ACETATE OCTAN MANGANATY (CZECH)... 

ALLYLIC OXIDATION Manganic acetate. Mercuric acetate. Selenium dioxide. 

Most of the reported work on the kinetics of catalysed polycondensation by transesterification is quite recent and in the main deals with the preparation of PET, though related work on other esters from ethylene glycol has been reported. Reinisch et al. [34] found that the melt polycondensation leading to poly(ethylene sebacate) in 3—4 mm films under vacuum, with manganous acetate as catalyst, was second order from p = 0.70 to p = 0.97. Rate coefficients are listed in Table 5 for this reaction, for the formation of poly(ethylene sebacate-co-terephthalate) and for PET. 

Manganic acetate (manganese triacetate), Mn(OCOCH3)3, is prepared by refluxing a solution of manganese acetate tetrahydrate in acetic acid with potassium permanganate [S03]. This oxidant hydroxylates ben-zylic methylene groups [416] and forms lactones from terminal alkenes [803, 804] (see equation 88). 

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