For phenyl derivatives of the cyclo- pentane group see F.
For example, the difference due to an increment of CH 2 is about 56.6, as is shown in the following table: - Since the critical volume of normal pentane C5H12 is 307.2, we have H 2 = C 5 H 12 -5CH 2 =307.2 - 5 X56.6 =24.2, and C=CH2 - H2= 32.4.
65, well, 7riwv, fat), a hydrocarbon of the paraffin series, probably a pentane, C 5 H 12, discovered by K.
Similarly, pentane, C 5 H 12, and hexane, C6H14, may exist in three and five theoretically isomeric forms respectively; confirmation of this theory is supplied by the fact that all these compounds have been obtained, but no more.
When heated with fuming hydriodic acid to 300° C. it yields normal pentane and ammonia, and hydrogen peroxide oxidizes it to glutarimide and to a piperidinium oxide or oxime (R.
POLYMETHYLENES, in chemistry, cyclic compounds, the simplest members of which are saturated hydrocarbons of general formula C 7, H 2nj where n may be r to 9, and known as tri-, tetra-, penta-, hexa-, and hepta-methylene, &c., or cyclo- propane, -butane, -pentane, -hexane, -heptane, &c.: - CH 21 CH 2 CH 2 CH2.CH2 CH2 CH2 CH2?C1H,, I I H ?
When sodio-malonic ester is condensed with trimethylene bromide the chief product is ethyl pentane tetracarboxylate, tetramethylene dicarboxylic ester being also formed, and from this the free acid may be obtained on hydrolysis.
Cyclo-pentane Group. Derivatives may be prepared in many cases by the breaking down of the benzene ring when it contains an accumulation of negative atoms (T.
Cyclo-pentane, C5H10, is obtained from cyclo-pentanone by reducing it to the corresponding secondary alcohol, converting this into the iodo-compound, which is finally reduced to the hydrocarbon (J.
It is a colourless liquid which boils at 50-51° C. Methyl-cyclo-pentane, C 5 H 9 CH 3, first obtained by F.
Cyclo-pentene, C 5 H 8, a liquid obtained by the action of alcoholic potash on iodo-cyclo-pentane, boils at 45° C. Cyclopentadiene, C. 1 H 6, is found in the first runnings from crude benzene distillations.
On oxidation it yields cyclo-pentane-pentanone (leuconic acid).
Derivatives of the cyclo-pentane group are met with in the breaking-down products of the terpenes.
Campholic acid, C 1 oH 18 0 2, is tetramethyl-22.214.171.124-cyclo-pentane acid-3.
Blanc (Comptes rendus, 1903, 136, p. 1460), prepared hydrocarbons of the cyclo-pentane series from cyclo- hexane compounds by the exhaustive methylation process of A.
3dicarboxylic acids) are obtained by the action of methylene iodide on disodio-pentane tetracarboxylic ester (W.
Cyclo-propane, -butane, -pentane, -hexane.