Isomer sentence example

isomer
  • An isomer of cinnamic acid known as allo-cinnamic acid is also known.
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  • According to the above formula the critical temperature is given by 8aA/54b, and as the critical temperature is approximately proportional to the boiling-point, both being estimated on the absolute scale of temperature, we may conclude that the larger value of b corresponds to the lower boilingpoint, and indeed the isomer corresponding to the left-hand formula boils at 74°, the other at 114°.
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  • 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.
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  • The remaining isomer, pivalic or trimethylacetic acid, (CH3)3C C02H, melts at 35° and boils at 163°.
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  • 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.
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  • Homo-pyrocatechin is an isomer (CH 3: OH: OH= I: 3 : 4), found as its methyl ether (creosol) in beech-wood tar.
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  • Ladenburg (Ann., 1875, 179, p. 163) to be symmetrical trimethyl benzene; terephthalic acid, the remaining isomer, must therefore be the para-compound.
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  • 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.
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  • Only the (Z) isomer was formed in analogy to the N, O ketene acetals.
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  • This is known as a racemic mixture and it is optically inactive due to one isomer canceling out the optical effect of the other.
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  • Not only is the product a stereospecific optical isomer, the reactant is it self a stereospecific geometrical isomer!
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  • The active site of an enzyme will only be able to operate on one type of optical isomer.
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  • The geometry of the s-trans isomer also shows a significant double bond character for the N-P bond.
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  • This bond distance is longer for the s-cis isomer, which also shows a shortening of the central N-N bond (Figure 1 ).
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  • You will notice that: the trans isomer has the higher melting point; the CIS isomer has the higher boiling point.
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  • Chavibetol, an isomer of eugenol, occurs in the ethereal oil obtained from Piper betle.
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  • According to the above formula the critical temperature is given by 8aA/54b, and as the critical temperature is approximately proportional to the boiling-point, both being estimated on the absolute scale of temperature, we may conclude that the larger value of b corresponds to the lower boilingpoint, and indeed the isomer corresponding to the left-hand formula boils at 74°, the other at 114°.
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  • The remaining isomer, pivalic or trimethylacetic acid, (CH3)3C C02H, melts at 35° and boils at 163°.
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  • Atropine is optically inactive; hyoscyamine, possibly a physical isomer, which yields atropine when heated to 108.6°, is laevorotatory.
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  • 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).
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  • Recent research work has been directed at the toxicity associated with the levo isomer, and how it compares with the racemic preparation.
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  • Phenazone is an isomer of phenazine, to which it bears the same relation that phenanthrene bears to anthracene.
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  • Atropine is optically inactive; hyoscyamine, possibly a physical isomer, which yields atropine when heated to 108.6°, is laevorotatory.
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  • 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.
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