Double links

Reaction.—orange is decomposed, like the majority of a20-compounds, by stannous chloride in hydrochloric acid into tj>o molecules, produced by the addition of hydrogen to tire double-linked nitrogen atoms (see p. 173). 

An interesting relation exists between the two gioups of acids. It has been found that, on heating /dy-acids with caustic soda solution, a shifting of the double link on the /3-position takes place,... 

The first tetrahydrogen decavanadate has been isolated from a methanol solution as the compound [(n-(C4H9)4N]2[H4Vio028]. In this case the hydrogen atoms are attached to two double-linked oxygen atoms and to two triple-linked oxygen atoms (47). 

Das D, KP Eurenius, EM Billings, P Sherwood, DC Chatfield, M Hodoscek, BR Brooks (2002) Optimization of quantum mechanical molecular mechanical partitioning schemes Gaussian delocalization of molecular mechanical charges and the double link atom method. J. Chem. Phys. 117 (23) 10534-10547... 

Raman spectra of thiocyanates appear to indicate that the ion is —S—C=N rather than S=C=N—, since a line assignable to the triple link and none for the double link was observed. Salts will be written as, e.g. KSCN and the ion as SCN-. 

Polyolefins consist of very long chains of the alkene type with thousands of carbon atoms, but possessing only one final double link in the a position. Theory shows that thermal cracking leads to shorter molecules, but of the same type. These shorter chains generally possess only one final double link in the a position. Most of these molecules are therefore a-olefins. 

Because of the presence of a double link and an aldehyde group in its molecule, acrolein forms two different types of compounds, according to whether the double link or the aldehyde-oxygen takes part in the reaction. Thus, with the halogens or the halogen hydroacids, the following take place ... 

The presence in a molecule of a nitrogen atom united by a double link to an oxygen almost always involves a certain degree of toxicity. Moreover, this toxicity is increased and lachrymatory action is added if halogen atoms are also present. 

Hantzsch Stereo Formula.—A development of the Kekule formula to agree with the existence of isomeric diazotates was suggested by Hantzsch. He assumed geometric stereo-isomerism due to the double linking of two nitrogen atoms, and this assumption has been supported not only by the isomerism of the diazotates, but also of other similar... 

Fig. 64e shows a [1102(804)2] chain that can be considered as based upon the cl/lb chain topology with each black vertex having a double link to the additional white vertex. Replacement of the latter by a grey vertex results in a chain shown in Fig. 64f Here grey vertices correspond to the NOs triangular groups that share edges with the UO7 pentagonal bipyramids.

The influence of the new hypothesis upon compounds containing doubly linked carbon atoms. Double linking is represented by two tetrahedrons with one edge in common (Figure IX.) in which A and B represent the union of the two carbon atoms, and R R"" R" R represent the univalent groups which saturate the remaining free affinities of the carbon atoms. 

We have but to examine the case where the double linking of the unsaturated body is caused by the disappearance of some of the... 

Destruction of polybutadiene that occurs under the action of nitric acid is caused by oxidation of a polymer macromolecule. In other words, cross-section links of a spatial composite network formed by the vulcanization process are broken. The well-known oxidization ability of sulfuric acid is responsible for a decrease in double links in the rubber molecular structure, resulting in a reduction in the RubCon strength indexes. Corrosive attack by hydrochloric acid is linked to oxidation and isomerization processes and, therefore, the durability of the composite depends on the speed of these processes. 

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