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racemic

racemic

racemic Sentence Examples

  • Berzelius by the dry distillation of tartaric or racemic acids (Pogg.

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  • Since the molecule contains an asymmetric carbon atom, the acid exists in three forms, one being an inactive "racemic" mixture, and the other two being optically active forms. The inactive variety is known as paramandelic acid.

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  • J.C.S., 1907, 1, p. 632), who showed that two racemic propyl tetrahydroberberines are produced when propyl dihydroberberine is reduced.

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  • Their constitution follows from their formation from dibromosuccinic acid and from their synthesis from glyoxal cyanhydrin, these two methods producing the inactive racemic form which may then be split into the active components.

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  • By mixing equal quantities of the two forms in aqueous solution heat is evolved and racemic acid, (C4H606)2.2H20, is obtained.

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  • Pasteur, Ann., 1853, 88, p. 212); by heating tartaric or racemic acid for some time with water to 165° C.; by the oxidation of laevulose; and by the oxidation of phenol or maleic acid with an alkaline solution of potassium permanganate (0.

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  • It crystallizes in prisms, and in the anhydrous state melts at 140° C. On prolonged boiling with aqueous hydrochloric acid it yields racemic acid.

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  • The alkaloids fall into two chemical groups: (i) derivatives of isoquinoline, including papaverine, narcotine, gnoscopine (racemic narcotine), narceine, laudanosine, laudanine, cotarnine, hydrocotarnine (the last two do not occur in opium), and (2) derivatives of phenanthrene, including morphine, codeine, thebaine.

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  • The a-propyl piperidine so obtained is the inactive (racemic) form of conine, and it can be resolved into the dextroand laevo-varieties by means of dextro-tartaric acid, the d-conine d-tartrate with caustic soda giving d-conine closely resembling the naturally occurring alkaloid.

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  • By mixing the d- and 1- forms, a racemic variety melting at 253° C. is.

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  • The racemic trans-acid is produced by the reduction of the dihydrobromide of A 4 -tetrahydrophthalic acid or dihydrophthalic acid.

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  • The trans-acid is a racemic compound, which on heating with acetyl chloride gives the anhydride of the cis-acid.

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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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  • This property has been used to separate racemic mixtures.

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  • Like AMO, it oxidizes propene to epoxypropane, but yields a racemic product.

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  • racemic bupivacaine.

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  • racemic mixtures.

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  • racemic preparation.

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  • Berzelius by the dry distillation of tartaric or racemic acids (Pogg.

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  • Since the molecule contains an asymmetric carbon atom, the acid exists in three forms, one being an inactive "racemic" mixture, and the other two being optically active forms. The inactive variety is known as paramandelic acid.

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  • J.C.S., 1907, 1, p. 632), who showed that two racemic propyl tetrahydroberberines are produced when propyl dihydroberberine is reduced.

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  • It may be prepared by heating racemic acid (see TARTARIC Acid) with fuming hydriodic acid; by heating fumaric acid (q.v.) with water at 150-200° C.; by the action of nitrous acid on inactive aspartic acid; and by the action of moist silver oxide on monobromsuccinic acid.

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  • Four acids of this composition are known, namely dextroand laevo-tartaric acids, racemic acid and mesotartaric acid, the two last being optically inactive (see Stereo-Isomerism).

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  • Their constitution follows from their formation from dibromosuccinic acid and from their synthesis from glyoxal cyanhydrin, these two methods producing the inactive racemic form which may then be split into the active components.

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  • It may also be obtained (together with racemic acid) by oxidizing milk sugar, saccharic acid, &c., with nitric acid, and by the reduction of oxalic ester with sodium amalgam (H.

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  • By mixing equal quantities of the two forms in aqueous solution heat is evolved and racemic acid, (C4H606)2.2H20, is obtained.

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  • Pasteur, Ann., 1853, 88, p. 212); by heating tartaric or racemic acid for some time with water to 165° C.; by the oxidation of laevulose; and by the oxidation of phenol or maleic acid with an alkaline solution of potassium permanganate (0.

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  • It crystallizes in prisms, and in the anhydrous state melts at 140° C. On prolonged boiling with aqueous hydrochloric acid it yields racemic acid.

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  • The alkaloids fall into two chemical groups: (i) derivatives of isoquinoline, including papaverine, narcotine, gnoscopine (racemic narcotine), narceine, laudanosine, laudanine, cotarnine, hydrocotarnine (the last two do not occur in opium), and (2) derivatives of phenanthrene, including morphine, codeine, thebaine.

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  • The a-propyl piperidine so obtained is the inactive (racemic) form of conine, and it can be resolved into the dextroand laevo-varieties by means of dextro-tartaric acid, the d-conine d-tartrate with caustic soda giving d-conine closely resembling the naturally occurring alkaloid.

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  • The trans compound is perfectly asymmetric and so its mirror image (I) should exist, and, as all the trans compounds synthetically prepared are optically inactive, they are presumably racemic compounds (see 0.

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  • By mixing the d- and 1- forms, a racemic variety melting at 253° C. is.

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  • The racemic trans-acid is produced by the reduction of the dihydrobromide of A 4 -tetrahydrophthalic acid or dihydrophthalic acid.

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  • The trans-acid is a racemic compound, which on heating with acetyl chloride gives the anhydride of the cis-acid.

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  • Absence of rotary power when asymmetric carbon atoms are present, may be caused by an internal compensation within the molecule as with the inactive tartaric acid (mesotartaric acid), or may be due to the fact that the compound is an equimolecular mixture of leftand right-hand varieties, this being the case with racemic acid that was broken by Louis Pasteur into laevoand dextro-tartaric acid (see Stereo-Isomerism).

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  • The cost in Colombia is 40% higher, than racemic bupivacaine.

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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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  • Aerosolized racemic epinephrine as well as oral dexamethasone (a steroid) may be used to help shrink the upper airway swelling.

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