Organic compounds representations

Figure 1 Diagrammatic representation of the nondimensional profiles of mineral nutrients and organic compounds in the. soil surrounding a root. Note that the width of the rhizosphere (arbitrary units) differs for different solutes.

Fig. 13 Representation of the sorption of organic compounds to two forms of sediment organic matter, amorphous organic matter and black carbon (BC), and its effect on bioavailability...

The cyclic forms adopted by the hexoses and pentoses can be depicted as symmetrical ring structures called Haworth projection formulae, which give a better representation of the spatial arrangement of the functional groups with respect to one another. The nomenclature is based on the simplest organic compounds exhibiting a similar five- or six-membered ring... 

There have been attempts to apply formal methods to the representation of organic compounds [1],[2], some attempts to apply artificial intelligence to organic synthesis [3],[4], and numerous attempts to apply the use of molecular orbital calculations to the verification of the validity of compounds in the synthesis route. This effort was a moderate attempt to examine the representation issues involved in writing production rules for Diels-Alder disconnections. 

There are various ways of representing organic compounds and, as these are universal, chemists the world over can communicate with each other, despite the fact that they may speak different languages. We will consider these different representations in the following sections. 

Yan, a. and Gasteigee, J. Prediction of aqueous solubility of organic compounds based on a 3D stmcture representation. /. Chem. Inf. Comput. 

Fig. 11.1 Schematic representation of NAPL movement from land surface to the water table region, (a) LNAPL movement, and (b) DNAPL movement (after Abriola and Pinder 1985). Reproduced by permission of American Geophysical Union. Abriola LM, Pinder GF (1985) A multiphase approach to the modelling of porous media contamination by organic compounds. Water Resour Res 21 11-18. Copyright 1985 American Geophysical Union...

The study of carbon compounds provides us with the subdivision organic chemistry , and a few simple organic compounds can exempMfy this shorthand approach to molecular representations. The primary alcohol propanol (systematically propan-l-ol or 1-propanol, formerly n-propanol, n signifying normal or unbranched) can be represented by a stmcture showing all atoms, bonds, and lone pair or nonbonding electrons. 

Molecular representations and functional groups in organic compounds, (a) Different ways to represent the structures of aliphatic and aromatic compounds, (b) Some important functional groups attached to organic skeletons, and the corresponding names of organic compounds. 

Figure 9.1—Conventional representation of a lH NMR spectrum of an organic compound. Spectrum of butanone [CH1(C=0)CH2CH1] Superimposed is the signal integration that allows the relative areas of each type of proton present in the spectrum to be determined. The meaning of the abscissa will be explained further on.

Figure 9.13—Effect of resonance on carbonyl-containing compounds. Representation of the delocalisation of valence electrons in mesomeric forms of organic compounds. In1 C NMR, the signal corresponding to a carbonyl in an ester is at 165 ppm, whereas it is at 205 ppm for a ketone.

Yan, A., J. Gasteiger, M. Krug, and S. Anzali. 2004. Linear and nonlinear functions on modeling of aqueous solubility of organic compounds by two structure representation metdoCtomput. Aided Mol. Des 18 75-87. 

Two stereostructural isomers are called d- and L-enantiomers for sugars and amino acids, but, for general organic compounds, R and S representation is common. We adopt the R and S representation hereafter. 

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