Hydrocarbon residues

In addition to inorganic radicals, which profoundly modify the properties of a paraflSn hydrocarbon residue, there is a whole series of organic groupings which are distinguished by exceptional reactivity, for example, the ethylene and acetylene groupings, and the phenyl and naphthyl radicals. Thus the characterisation of unsaturated hydrocarbons and their derivatives, e.g., the aromatic compounds, becomes possible. 

Unsubstituted PMDs (2) or dyes containing odd alternate hydrocarbon residues as end groups can exist in two relatively stable forms distinguished by a TT-electron pair, eg, a,CO-diphenylpolymethines (9). 

Y = RS", RCOO, or RO" (where R is a hydrocarbon residue or an organic moiety containing one or more heteroatom functionalities). 

The composition of some common fets end oils. Fatty acids provide the R. R, and R" hydrocarbon residues in the general structure of a fat or oil shown in the text. Fats and oils all contain a mixture of saturated, monounsaturated. and polyunsaturated fatty acids. 

There is considerable interest in the removal of contaminants from the sites of former gas-lilling stations. The surrounding soil is contaminated not only with fuel hydrocarbon residues, but also with alkyl lead compounds that were previously used as gasoline additives. It has been shown... 

The total rate constant kexp = kK weakly depends on the hydrocarbon residue, which is seen from the data collected in Table 10.3. However, the ligand environment, as well as the solvent, has a substantial effect on the k value [4—9]. 

Buhler, D.R., R.R. Claeys, and B.R. Mate. 1975. Heavy metal and chlorinated hydrocarbon residues in California sea lions (Zalophus californianus californianus). Jour. Fish. Res. Board Canada 32 2391-2397. 

An important distinction between molecular and supramolecular chemistry is that, in the latter, hydrocarbon residues are functionalities. 

That the dimer synthon is found in as many as a third of all carboxylic acids is quite impressive, considering the very large variety of other functional groups that are present in the acids contained in the CSD. If, however, one were to consider only simple carboxylic adds - that is, with no other functionality present other than carboxyl and hydrocarbon residues - then the proportion of acids that contain dimer synthon II rises to around 85 %. Hence, the qualifier robust is justified in this case. 

Mes J, Davies DJ, Doucet J, et al. 1993. Levels of chlorinated hydrocarbon residues in Canadian human breast milk and their relationship to some characteristics of the donors. Food Add Contam 10(4) 429-441. 

Physical Form. Brownish-black viscous liquid or solid composed essentially of hydrocarbons residue from the evaporation of the lighter hydrocarbons from petroleum... 

Mes J. 1981. Experiences in human milk analysis for halogenated hydrocarbon residues. Inter J Environ Anal Chem 9 283-299. 

Mes J, Davies DJ, Turton D. 1982. Polychlorinated biphenyl and other chlorinated hydrocarbon residues in adipose tissue of Canadians. Bull Environ Contain Toxicol 28 97-104. 

Lipophilicity. The gross lipophilicity of the ligand and of its complexes plays a very important role whenever substances soluble in organic media of low polarity are needed. This is the case in studies of anion activation and of cation transport through lipid membranes, where salts have to be dissolved in organic phases. The lipophilic character may be controlled via the nature of the hydrocarbon residues forming the ligand framework or attached to it. 

Hydrochloric Acid for removing basic tars Na Hydroxide for acidic tars Benzene for hydrocarbon residues Acetone for partially oxidized tars... 

The results collected in Table 5 suggest that hydrocarbon residues, especially aromatic groups, in the solvent are strongly responsible for the interaction with cis-(1+4). The position of the largest hydrocarbon residue apparently determines whether P- or M-[6]-helicene will be formed in excess. Replacement of the methyl group in (S)-ethyl lactate (b) by a phenyl group giving (S)-ethyl mandelate (d), increases the optical yield fivefold. 

Wang, X., Yu, X. Bartha, R. (1990). Effect of bioremediation on polycyclic aromatic hydrocarbon residues in soil. Environmental Science Technology, 24, 1086-9-... 

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