Analysis of the equations which describe the gas-chromatographic behavior of homologous series of organic compounds

1981 ◽  
Vol 30 (8) ◽  
pp. 1494-1501
Author(s):  
R. V. Golovnya ◽  
D. N. Grigor'eva ◽  
I. L. Zhuravleva
Keyword(s):  
Organic Compounds ◽  
Homologous Series ◽  
Chromatographic Behavior

scholarly journals Precambrian organic compounds from the Ketilidian of South-West Greenland. Part III

1970 ◽  
Vol 82 ◽  
pp. 1-42
Author(s):  
K.R Pedersen ◽  
J Lam
Keyword(s):  
Fatty Acids ◽  
Organic Compounds ◽  
Homologous Series ◽  
Mass Spectra ◽  
Methyl Esters ◽  
Graphite Layer ◽  
Straight Chain ◽  
Normal Alkanes ◽  
Cyclic Hydrocarbons ◽  
Alkyl Benzenes

Ketilidian sedimentary rocks nearly 2000 m.y. old and only slightly metamorphosed have been shown to contain fossils and organic compounds. Results of work on organic material from a 1-3 m thick coal-graphite layer from the Foselv Formation in the Sortis Group in Grænseland are presented. Aliphatic (straight chain, branched and cyclic) hydrocarbons are dominant in the extract from two coal-graphite samples weighing about 4 kg and 10 kg respectively. Further investigations of these compounds have revealed many saturated straight-chain hydrocarbons, with the n-C15 alkane, the most abundant among the normal alkanes, ranging from C12 to about C21, and various isoalkanes and anteisoalkanes. Saturated cyclic hydrocarbons like alkyl cyclohexanes, and homologous series of alkyl benzenes and alkyl naphthalenes are also present. A series of monoterpenoid compounds is present. Six of them are fairly well characterized by their mass spectra. Fatty acids and methyl esters of fatty acids are present, notably a homologous series of straight-chain fatty acids. Branched acids are also present in minor amounts. The organic compounds further indicate that this Precambrian coal-graphite layer is the result of biological activity.

scholarly journals CHEMICAL STIMULATION BY ALCOHOLS IN THE BARNACLE, THE FROG AND PLANARIA

1930 ◽  
Vol 14 (1) ◽  
pp. 71-86 ◽  
Author(s):  
William H. Cole ◽  
J. B. Allison
Keyword(s):  
Reaction Time ◽  
Real Number ◽  
Organic Compounds ◽  
Homologous Series ◽  
Chemical Stimulation ◽  
Concentration Effect ◽  
Alcohol Molecule ◽  
Polar Group ◽  
The Relationship ◽  
Geometrical Series

1. The stimulating efficiencies of some normal primary aliphatic alcohols have been determined for the barnacle, the frog, and Planaria, under conditions which do not involve narcosis or simultaneous stimulation by other agents. 2. Concentrations of the successive alcohols necessary to produce a given stimulatory effect vary according to the following geometrical series: 1: a–1: a–2: a–3: a–4: . . . ., where a represents some real number. 3. Within certain limits the relationship between the logarithm of the concentration necessary to produce a given effect and the reciprocal of the reaction time is linear in the frog and in Planaria. 4. The concentration effect may be expressed by an equation which contains one constant characteristic of the alcohol series, and another one characteristic of each member. The ratio of the latter constants for successive alcohols represents a in the above series. 5. The stimulation by alcohols in these animals is considered to be due to energy changes at the receptive surfaces, brought about by a definite orientation of the respective alcohol molecules. Increase in stimulating efficiency as the number of CH2 groups increase must be due to the rôle of the non-polar portion of the alcohol molecule, since the polar group remains practically constant throughout the series. 6. In homologous series of organic compounds it is conceived that stimulating effects will be produced either by the polar group or the non-polar group, according to which one becomes dominant in effect, or to a combination of the two.

scholarly journals Refractive dispersion of organic compounds VII-The refractive indices of the hexane and the refractive of hydrogen and carbon. Significance of the dispersion constants

1936 ◽  
Vol 153 (879) ◽  
pp. 379-391 ◽  
Keyword(s):  
Organic Compounds ◽  
Homologous Series ◽  
Refractive Indices ◽  
Open Chain ◽  
Molecular Refraction ◽  
The Mean ◽  
The Law

The law of additivity as applied to molecular refractions is based on two empirical observations, both of which were first established quanti-tatively by Landolt,* namely, (i) the constancy of the increment of molecular refraction corresponding to each addition of CH 2 in a homologous series, and (ii) the identity of the molecular refractions of Homeric compounds. With the help of this law the refractivity of a molecule may be resolved into the sum of a series of atomic refractivities. Thus Eisenlohr in 1910 calculated the refractivities of carbon and hydrogen, for the D-line of sodium and for the three visible 1ines of hydrogen, from measurements of the refractive indices at these wave-1engths of 145 open-chain hydrocarbons, aldehydes, ketones, acids, alcohols, and esters, as foIlows: (i) The refractivity of the methylene radical R[CH 2 ] was deduced from the mean increment between consecutive members of various homologous series. (ii) The refractivity of was deduced by extrapolation from the refractivities of the series of paralffins by means of the relation R[H 2 ]=R[C n H 2 n +2 ]- n R[CH 2 ].

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