Toluene, complex with chloroform

Many calixarenes form complexes in the solid state, this property having been observed even before the structure of compounds was established. Among the simple ca-lix[n]arenes, for example, / >-rer/-butylcalix[4]arene forms complexes with chloroform, benzene, toluene, xylene, nitrobenzene, nitromethane, acetonitrile, and many others, while /r-rer/-butylcalix[5]arene complexes were studied with lower alcohols, ethyl acetate, toluene, and tetraline. More flexible / -terr-butylcalix[6]arene was found to form complexes with acetonitrile and / -rerr-butylcalix[8]arene with chloroform. The tenacity with which the guest molecule is held by the calixarene hosts varies widely with the size of macrocycle. Whereas tetramers to hex-... 

An enormous variety of solvates associated with many different kinds of compounds is reported in the literature. In most cases this aspect of the structure deserved little attention as it had no effect on other properties of the compound under investigation. Suitable examples include a dihydrate of a diphosphabieyclo[3.3.1]nonane derivative 29), benzene and chloroform solvates of crown ether complexes with alkyl-ammonium ions 30 54>, and acetonitrile (Fig. 4) and toluene (Fig. 5) solvates of organo-metallic derivatives of cyclotetraphosphazene 31. In most of these structures the solvent entities are rather loosely held in the lattice (as is reflected in relatively high thermal parameters of the corresponding atoms), and are classified as solvent of crystallization or a space filler 31a). However, if the geometric definition set at the outset is used to describe clathrates as crystalline solids in which guest molecules... 

The red and orange forms of RhCl[P(C6H5)3]3 have apparently identical chemical properties the difference is presumably due to different crystalline forms, and possibly bonding in the solid. The complex is soluble in chloroform and methylene chloride (dichloromethane) to about 20 g./l. at 25°. The solubility in benzene or toluene is about 2 g./l. at 25° but is very much lower in acetic acid, acetone, and other ketones, methanol, and lower aliphatic alcohols. In paraffins and cyclohexane, the complex is virtually insoluble. Donor solvents such as pyridine, dimethyl sulfoxide, or acetonitrile dissolve the complex with reaction, initially to give complexes of the type RhCl[P(C6H6)3]2L, but further reaction with displacement of phosphine may occur. 

There are many well-established methods for separation and structure determination of ecdysteroids.20 27 A newly described method is two-dimensional thin-layer chromatography. It has been used to separate complex mixtures of phytoecdysteroids. Silica plates were developed first with toluene—acetone—ethanol—25% aqueous ammonia (100 140 32 9 v/v) and then developed in the other direction with chloroform—methanol—benzene (25 5 3 v/v)48... 

A similar study has looked at the extraction of both ID and Pu by di-(2-ethylhexyl)phos-phoric acid from perchloric acid into dodecane, toluene, and chloroform. Extractant dependency studies show two molecules of DEHPA complex with one or Pu ion in the extracted species, accompanied by the liberation of two protons. This agrees with the ion exchange mechanism reported by Sato for from HCl media at low acid concentrations. 

In an earlier paper, we compared the metal complexation properties of polymeric phenolic oximes of type lA to the analogou.s monomeric compounds of type IB, and found striking differences between the two. Phase transfer of cupric ions from an aqueous phase by complexation with soluble hydrophobic compounds of type IB, in an organic phase (toluene, chloroform) proceeds very well. By contrast, ion complexation by the insoluble... 

When the colloidal solution of germanium phenylfluoronate is shaken with CCU, the precipitate agglomerates at the interface. After removal of nearly all the CCLt and the aqueous solution (containing the excess of phenylfluorone), the precipitate is dissolved in acetone and the absorbance measured [21]. High sensitivity (e= 1.2-10 at 495 nm) is obtained, if phenylfluorone is added to a chloroform extract of Ge complex with N-p-chlorophenyl-2-furohydroxamic acid [8]. A DMF solution of phenylfluorone was also added to a toluene extract of GeCL (e = 7.1 10 at 525 nm [3].An aqueous solution of Ge was also... 

The [3-diketiminato copper complex is a pale yellow solid that is freely soluble in benzene, toluene, chlorobenzene, THF, and acetonitrile while partially soluble in diethyl ether and pentane. In solution, the toluene ligand dissociates. When dissolved in benzene, for example, the NMR spectrum exhibits signals for both LMe Me3cu(benZene) (major species) and [LMe,Me3Cu]2(benzene) (minor species). The copper complex reacts slowly with chloroform and dichloromethane, resulting in a gradual darkening of the solution to purple. 

An extremely sensitive test, specific for ketoses, has been described, but its colorimetric adaptation has not yet been made, despite the very promising results D-fructose (0.3 mg.), boiled for 30 seconds with the zinc complex of toluene-3,4-dithiol in dilute hydrochloric acid, forms an orange precipitate almost immediately. Extraction is readily effected with chloroform, and this might possibly be applied to quantitative estimation. 

Orthorhombic bipyramidal needles from alcohol, d 1.189. nip 95 . bp 279. uv spectrum Seshan, Proc. Indian Acad. Sci A3, 148 (1936). Factors influencing the uv spectrum Jones, J. Am. Chem. Soc. 67, 2127 0945). Insol in water. One gram dissolves in 31 ml alcohol, 56 ml methanol, 25 ml propanol, 2.5 ml chloroform, 5 ml benzene Or toluene. 3.2 g are sol in 100 ml glacial acetic acid. Forms water-sol, crysi complexes with desoxycholic acid, containing two molecules of the bile add as a rule. The complexes crystallize when concentrated solns of the proper amount of the components in alcohol or dioxane are allowed to cool slowly. 

Complex formation can also be influenced by the nature of the connecting bridge between the complexing unit and the polymer chain. For example, the transfer of Cu from the aqueous to the organic phase (chloroform, toluene) for the formation of a complex with a hydrophobic low molecular weight ligand (compound 3a) occurs readily. In contrast, complexation by the polymeric analogue 3b is ineffective. Only the replacement of the short and hydrophobic... 

The promoting effect of heating on the formation of a PANi/DBSA complex in the solid phase has been investigated previously in our laboratory, especially by differential scanning calorimetry [52]. In addition to good solubility in common organic solvents such as toluene, xylene, and chloroform, DBSA with a long ali-... 

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