Untersuchungen über das Kodeinoxyd

Freund, Martin; Speyer, Edmund

doi:10.1002/cber.19110440353

Cited by 16 publications

(6 citation statements)

References 4 publications

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“…This is well known for kaolinite. 29) Therefore, one would expect that there should be a decrease in Young's modulus during these processes and after their termination. However, our results of the mf-TMA from Fig.…”

Section: Resultsmentioning

confidence: 99%

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Use of fly ash in ceramic tiles: elastic properties during firing

Trník

Ncaron

Rcaron

et al. 2013

J. Ceram. Soc. Japan

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Two green ceramic materials were studied during heating from room temperature to 1100°C. One material (CG) contained clay (60 mass %) and grog (40 mass %), while the other (CGF) contained clay (60 mass %), grog (20 mass %), and fly ash (20 mass %). The investigated green ceramics are a mixture of minerals (kaolinite, illite, muscovite, calcite, and quartz). The main improvement of the mechanical properties between 20 and 300°C is due to the liberation of physically bound water. In the temperature region from 300 to 900°C very small changes of the sample volume are observed, and Young's modulus slightly increases. From 900 to 1100°C, the sintering and creation of new phases causes a large shrinkage of the sample volume, and Young's modulus dramatically increases its value. The total shrinkage of the sample volume during heating is ³6% for CG and ³24% for CGF. The relative change of Young's modulus is ³220% for CG and ³190% for CGF.

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Section: Resultsmentioning

confidence: 99%

“…30) Another explanation may be due to the fact that the dehydroxylation is a source of electrically charged defects. 29) Many of them are assumed to be located on the crystal faces and, consequently, the attractive van der Waals electrostatic forces fortify samples.…”

Section: Resultsmentioning

confidence: 99%

Use of fly ash in ceramic tiles: elastic properties during firing

Trník

Ncaron

Rcaron

et al. 2013

J. Ceram. Soc. Japan

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“…Since both Mg(OH)z and AI(OH)3 have been said to retain protons during dehydroxylation and to lose water by a mechanism involving the tunnelling of these protons through the P.E. barrier [19], the effect of the field on the protons should be similar in both materials. The tunnelling probability of the proton depends on the height and width of the energy barrier which in turn depends on the dissociation energy of the O-H bond in the crystalline hydroxide; this energy has been cal-culated for crystalline Mg(OH).)…”

Section: Discussionmentioning

confidence: 99%

Thermal reactions of inorganic hydroxy-compounds under applied electric fields, II

MacKenzie

1973

Journal of Thermal Analysis

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The effect of electric fields on the thermal dehydroxylation of Mg(OH)2 (brucite) and AI(OH)3 (gibbsite) have been studied by thermogravimetry in a controlled inert atmosphere. Electric fields exert no beneficial effect on the reaction of gibbsite; in some cases the reaction is slightly retarded. By contrast, a small but significant beneficial effect is observed in brucite, in which the initiation temperature and activation energy is lowered at field strengths of about 10 5 V/m. The difference in behaviour of the two hydroxides is attributed to differences in the mobility of anionic defects and oxygen-containing "proton-transfer complexes". The transport of the various protonbearing species in an electric field is discussed.

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“…We used dimethyl sulfate instead of methyl fluorosulfonate as alkylating agent. Catalytical hydrogenation over Pd/C in diluted AcOH, which was carried out similarly to the hydrogenation thebaine --f dihydrothebainone [6] [7], afforded 1 in 68 % yield. This new synthesis of 5-methyldihydrothebainone (1) provides a route to this important intermediate which is much more efficient than the one developed by Small and coworkers [3][4].…”

Section: (-)-N-[(cyclopropylmentioning

confidence: 99%

(−)‐N‐[(Cyclopropyl) methyl]‐3,4‐dimethoxy‐5‐methylmorphinan‐6‐one, an opioid agonist with preference for kappa opioid receptors

Schmidhammer

Fritsch

Burkard

et al. 1988

Helvetica Chimica Acta

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N-Allyl-and N-[(cyclopropyl)methyl]-3,4-dimethoxy-5-methylmorphinan-6-one (9 and 10, resp.) were synthesized from 5-methyldihydrothebainone (1). This essential intermediate was prepared from thebaine via 5-methylthebaine (5) employing a novel route. The pharmacological studies showed 9 and 10 to be potent opioid agonists. Compound 10 was found to have preference for kappa rather than mu opioid receptors.Introduction. -The opioid agonistic properties of N-methylmorphinan-6-ones are very much dependent on the substitution pattern at the aromatic ring [l]. Besides the 'natural' substitution pattern 3-hydroxy-4,5-epoxy, the 4-monomethoxy and the 3,4-dimethoxy substitution was found to be most effective. Among the compounds with high antinociceptive potency was 3,4-dimethoxy-5,17-dimethylrnorphinan-6-one (6) [2], which prompted us to replace its N-CH, group by substituents known to introduce in most cases opioid antagonistic effects in morphinans. We chose the N-ally1 and the N-(cyclopropy1)-methyl group which are present in the opioid antagonists naloxone and naltrexone, respectively.

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Untersuchungen über das Kodeinoxyd

Cited by 16 publications

References 4 publications

Use of fly ash in ceramic tiles: elastic properties during firing

Use of fly ash in ceramic tiles: elastic properties during firing

Thermal reactions of inorganic hydroxy-compounds under applied electric fields, II

(−)‐N‐[(Cyclopropyl) methyl]‐3,4‐dimethoxy‐5‐methylmorphinan‐6‐one, an opioid agonist with preference for kappa opioid receptors

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