Word Finder - isomer

definition

Any of two or more compounds with the same molecular formula but with different structure.

definition

Any of two or more atomic nuclei with the same mass number and atomic number but with different radioactive properties.

An isomer of cinnamic acid known as allo-cinnamic acid is also known.

Consequently, of each pair of isomers we may establish beforehand which is the more stable; either in particular circumstances, a direct change taking place, as, for instance, with maleic acid, which when exposed to sunlight in presence of a trace of bromine, yields the isomeric fumaric acid almost at once, or, indirectly, one may conclude that the isomer which forms under greater heat-development is the more stable, at least at lower temperatures.

Metaor iso-xylene, the most important isomer, may be prepared by nucleus-synthetic reactions, or by distilling mesitylenic acid, C 6 H 3 (CH 3) 2 CO 2 H, an oxidation product of mesitylene, C 6 H 3 (CH 3) 3, which is produced on the condensation of acetone, with lime; this reaction is very important, for it orientates meta-compounds.

Ladenburg (Ann., 1875, 179, p. 163) to be symmetrical trimethyl benzene; terephthalic acid, the remaining isomer, must therefore be the para-compound.

Jorgensen in the second dinitrotetramminecobalt chloride, [Co(NO 2) 2 (NH 3) 4 ]Cl, designated as flavo - whereas the older isomer of Gibbs was distinguished as croceo-salt.

Only the (Z) isomer was formed in analogy to the N, O ketene acetals.

This is known as a racemic mixture and it is optically inactive due to one isomer canceling out the optical effect of the other.

Not only is the product a stereospecific optical isomer, the reactant is it self a stereospecific geometrical isomer!

The active site of an enzyme will only be able to operate on one type of optical isomer.

The geometry of the s-trans isomer also shows a significant double bond character for the N-P bond.

This bond distance is longer for the s-cis isomer, which also shows a shortening of the central N-N bond (Figure 1 ).

Chavibetol, an isomer of eugenol, occurs in the ethereal oil obtained from Piper betle.

The fourth isomer, formed by the action of Bacillus laevo-lacti on cane-sugar, resembles sarcolactic acid in every respect, except in its action on polarized light (see Stereoisomerism).

Recent research work has been directed at the toxicity associated with the levo isomer, and how it compares with the racemic preparation.

Phenazone is an isomer of phenazine, to which it bears the same relation that phenanthrene bears to anthracene.

By the addition of the diazonium salts to a hot concentrated solution of a caustic alkali, C. Schraube and C. Schmidt(Ber., 18 94, 2 7, p. 520)obtained an isomer of potassium benzene diazotate.