Alkanes cyclohexane

Aliphatic Organophosphorous Compounds Aliphatic Organophosphorous Compounds Dibutyl Phosphate Tributyl Phosphate Alkanes and Cyclic Alkanes Alkanes and Cyclic Alkanes Cyclohexane Decane, n Fieptanes Fiexadecane Fiexanes... 

Itoh et al. used Cu yd-diketiminato complexes with general formula 4, and their reactivity has been described as a functional model for pMMO (particulate methane monooxygenase). Initially, the Hgands were reacted with both Cu and Cu precursors, with a variety of species formed, depending on the specific conditions employed [111, 112]. It was then shown that both Cu and Cu complexes ultimately led to bis(/z-oxo)(Cu )2 species upon reaction with O2 and H2O2, respectively. Use of these Cu complexes as the pre-catalysts for the oxidation of alkanes (cyclohexane and adamantane) in the presence of H2O2 resulted in low yields ( 20%). 

A solution of anhyd Et,N (13.8 mL. 0.1 mol) in CC14 (100 mL) (alkanes, cyclohexane and Et20 could alternatively be used) was placed in a 250-mL glass vessel and cooled down to < 0 C (for Et20 about... 

Amination of alkanes (cyclohexane, heptane, adamantane) was achieved with iron and manganese porphyrin catalysts by tosylimidoiodobenzene to yield tosyl-amino derivatives.200 Selective 1-substitution of adamantane (56% yield) and 2-substitution of heptane (66% selectivity) were reported. 

The source of the strain in adamantane is not readily apparent but appears to be due to features present in the rigid, cage structure of the molecule. Less rigid molecules, e.g. acyclic alkanes, cyclohexane and /nms-decalin, are free to relax and to adopt conformations in which the best balance between angle, nonbonded and torsional strain is achieved. Thus, C-C-C bond angles of 112.4... 

The catalytic activity of MePc depends on the nature of the ligand in the apical position and should therefore be solvent dependent.[56] From the chromatographic determination of the respective adsorption coefficients of the reaction partners in pre-catalytic conditions, a very pronounced activity difference is found depending on the nature of the solvent used.[64] However, the sequence of the adsorption coefficients is of zeolitic origin and reflects a sorption effect rather than a coordination effect. The respective values of the adsorption coefficients indicate that for the oxidation of alkanes, cyclohexane, with organic peroxide for example, in acetone the oxidant is enriched in the intracrystalline voids, resulting preferentially in peroxide decomposition. In excess cyclohexane, the substrate is enriched in the pores, so that every adsorbed peroxide molecule results in an efficient oxygenation. 

A mixed reagent formed from Ge[CH(SiMc3)2]2 or Ge[N(SiMe3)2]2 and PhX (X = Cl, Br, I) was shown to reaction directly with alkanes (cyclohexane, cyclopentane, butane, methylcyclopentane), aromatics (toluene, ethyl... 

Like acyclic alkanes, cyclohexane does not remain in a sii e conformation. The bonds twist and bend, resulting in new arrangements, but the movement is more restricted. One important conformational change involves ring-flipping, which can be viewed as a two-step process. 

Adipic acid Alkanes Cyclohexane Mutated organisms A five-enzyme sequence... 

Arenes show higher reactivity than alkanes, but this difference is not so pronounced as in many other cases benzene, which is the least reactive arene, exchanges its hydrogen atoms only twice as fast as the most reactive of the alkanes, cyclohexane. In the case of substituted aromatic molecules the steric effect is again very pronounced. 

The phase shifts of quantum beats have been studied in other alkanes as well [30], As expected, in linear alkanes the rate constants of hole trapping by acceptors, determined from the shifts, were close to the diffusion-controlled ones. In cyclic alkanes (cyclohexane, czs-decalin, and trans-decalin), the hole mobility is known to considerably exceed the mobility of molecular ions [31]. In these solvents the observed phase shifts had an intermediate value between that expected for the highly mobile holes and that assumed for molecular ions. Both types of ions are likely to take part in the formation of diphenylsulphide radical cation in cyclic alkanes. 

Figure 10.15 A mass spectrum of a cyclic alkane, cyclohexane, CgHi2-...

Hie free radical chlorination of three alkanes (cyclohexane, 2,3-dimethylbutane, and neopentane) was examined both in SC-CO2, and, for comparison purposes, in conventional organic solv ts. All of these experiments were carried out at 40 °C, and at alkane concentrations < 0.03 M 20). At such low alkane concentrations, little monochloride arises from reaction of Cl with alkane comprising die cage walls, ku (Scheme 1). 

Moreover, the copper and nickel complexes substituted by eight dodecyloxy chains displayed lyotropic Ncoi and Colh mesophases in contact preparations with organic solvents (linear alkanes, cyclohexane, benzene, chloroform). The lyomesophases were stable for the copper and nickel complexes, except for the binary mixture between the nickel complex and linear alkane, for which... 

Sato etal. [238] studied the mechanism of formation of silver halide particles grown from reverse microemulsions. In a typical process, aqueous solutions of either (a) silver nitrate or (b) a sodium salt, i.e. sodium chloride, bromide or iodide was injected into AOT/isooctane reverse micelles. When equal volumes of the two kinds of microemulsion were rapidly mixed at 25°C, particles started forming. The particle diameter was a function of the type of the anion, the w value as also reaction time. For AgBr, the maximum diameter was - 2.7 nm for Agl, it went up to 5.5 nm. Bagwe and Khilar [444] synthesized AgCl nanoparticles from AOT/ alkane (cyclohexane, heptane, decane) systems. The aqueous phases were solutions of silver nitrate or alkali/alkaline earth halides. The number average particle size was in the range of 4-10 nm. 

The investigations by NMR, kinetic, and theoretical methods implicate hydroxyl radicals in the mechanism of oxidation of alkanes (cyclohexane, n-heptane,... 

Kodera et al. synthesized a rigid (Tf-oxo-di T(-acctalo)diiron(III) complex with l,2-bis[2-di(pyridyl)methyl-6-pyridyl]ethane that is a dinucleating hexa-pyridine ligand. " The complex monooxygenates alkanes (cyclohexane, methylcyclohexane, adamantane) in the presence of m-CPBA with a large turnover frequency and number Radical-rebound mechanism was suggested based... 

Cycloalkanes are hydrocarbons that contain all single carbon-carbon bonds, but have one or more rings present. Their general formula is (which means they have two fewer hydrogen atoms than straight- or branched-chain alkanes do). With the exception of cyclohexane, cycloalkanes are not as common as straight- or branched-chain alkanes. Cyclohexane, however, is a common laboratory solvent for substances that would be insoluble in water. 

Marongiu, B. Dernini, S. Polcaro, A. M. Thermodynamics of binary mixtures containing cyclic alkanones. Excess enthalpies of cyclopentanone and cyclohexanone + n-alkanes, + cyclohexane, + benzene, and + tetrachloromethane J. Chem. Eng. Data 1986, 31,185-189... 

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