Kainic acid

EJ King. Acid Base Equilibria. New York Pergamon Press, 1965.  [c.439]

Fig. IV-20. Film pressure-area plots for cerebronic acid (a long-chain a-hydroxy carboxylic acid) and cholesterol (see insert) and for an equimolar mixture. At low pressures the r-a plot is close to that of the average (dashed line), an unanticipated kink then appears, and finally, the horizontal portion probably represents ejection of the cholesterol. (From Ref. 239.) Fig. IV-20. Film pressure-area plots for cerebronic acid (a long-chain a-hydroxy carboxylic acid) and cholesterol (see insert) and for an equimolar mixture. At low pressures the r-a plot is close to that of the average (dashed line), an unanticipated kink then appears, and finally, the horizontal portion probably represents ejection of the cholesterol. (From Ref. 239.)
O Connor D J, King B V, MacDonald R J, Shen Y G and Chen X 1990 The study of surfaces using ion beams Aust. J. Phys. 43 601  [c.1825]

By analogy, ammonium salts should behave as acids in liquid ammonia, since they produce the cation NH4 (the solvo-cation ), and soluble inorganic amides (for example KNHj, ionic) should act as bases. This idea is borne out by experiment ammonium salts in liquid ammonia react with certain metals and hydrogen is given off. The neutralisation of an ionic amide solution by a solution of an ammonium salt in liquid ammonia can be carried out and followed by an indicator or by the change in the potential of an electrode, just like the reaction of sodium hydroxide with hydrochloric acid in water. The only notable difference is that the salt formed in liquid ammonia is usually insoluble and therefore precipitates.  [c.90]

Y. K. Kang, M. S. Jhon, Theor. Chim. Acta 1982, 61, 41-48.  [c.336]

H. Erlenmeyer. O, Weber. P. Schmidt. G. Kung. C. Zinsstag. and B. Prijs, Hek, Chitn. Acta. 31. 1142 (1948) Chem. Abstr.. 42, 7291.  [c.352]

H. Erlenmeyer, O. Weber, P. Schmidt, G. Kung, C. Zinsstag. and B. Prijs, Helv. Chim. Acta. 31, 1142 (1948) Chem. Abstr.. 42, 7291,  [c.318]

Many polypeptides also assume helical structures in the crystalline state and—in equilibrium with unwound random conformations-in solution. In this case the helix is stabilized by hydrogen bonding between the N-H and 0=C groups on successive turns of the helix. Fixed bond angles and bond lengths restrict stable helices to those containing either 3.7 or 5.1 repeat units per turn. The former, commonly called the a helix, is shown in Fig. 1.10b it possesses about 18 amino acid residues in every five turns. Many globular proteins, for example, myoglobin, contain helical sections in which the helix is interrupted occasionally, the chain bends through a kink, then the helix resumes. Finally, there is the most famous helical structure of all the DNA double helix. Random coils are not without competition as the structure of polymer molecules  [c.65]

An equation of state of the form PV = RT was developed (17) for the vapor of concentrated and dilute hydrochloric acid which is vaUd up to a HCl mole fraction, x, of 0.23, at temperatures up to 780 K and pressures up to 15.0 MPa. A simplified Redhch-Kwong equation,  [c.441]

Alkanes can be simultaneously chlorinated and chlorosulfonated. This commercially useful reaction has been appHed to polyethylene (201—203). Aromatics can be chlorinated on the ring, and in the presence of a free-radical initiator alkylaromatic compounds can be chlorinated selectively in the side chain. King chlorination can be selective. A patent shows chlorination of 2,5-di- to 2,4,5-trichlorophenoxyacetic acid free of the toxic  [c.143]

H. Kunz and H. Waldmann, Helv. Chim. Acta, 68, 618 (1985).  [c.249]

Acetyl-a-amino-n-butyric acid [34271-24-4] M 145.2, pK 3.72. Crystd twice from water (charcoal) and air dried [King and King J Am Chem Soc 78 1089 7956].  [c.88]

Cyclic ketones are converted into vinyl and isopropenyl groups by the following sequence of reactions. The tertiary allylic alcohol, formed by the reaction of 4-/-butylcyclohexanone with isopropenyllithium, is converted into the carbonate 587 (formates of tertiary allylic alcohols cannot be prepared) and their reaction with triethlyammonium formate at room temperature generates the isopropenyl group 588 without forming the isopropylidene group 590. Also the primary allylic formate 589 is converted regioselectively into the isopropenyl group 588[384]. This reaction is useful for the regio- and stereoselective preparation of the C-17 /5-isopropenyl steroid 592 via the allylic carbonate 591 formed from C-17 keto steroids. Generation of the correct stereochemistry at C-20 of steroid side-chains has been achieved by hydroboration of 592[385]. Quantitative and completely regioselective removal of the nitro group from the allylic nitro system 593 has been applied to the synthesis of kainic acid[386].  [c.370]

Similarly to alkenes. alkynes also insert. In the reaction of 775 carried out under a CO atmosphere in AcOH, sequential insertions of alkyne, CO. alkene. and CO take place in this order, yielding the keto ester 776[483]. However, the same reaction carried out in THF in the presence of LiCl affords the ketone 777, but not the keto ester[484]. The tricyclic terpenoid hirsutene (779) has been synthesized via the Pd-catalyzed metallo-ene carbonylation reaction of 778 with 85% diastereoselectivity as the key reaction[485], Kainic acid and allo-kainic acid (783) have been synthesized by the intramolecular insertion ol an alkene in 780, followed by carbonylation to give 781 and 782[486],  [c.397]

Me2BBr, CH2CI2, —78°, 45 min, 100% yield. These conditions were chosen when conventional acid-catalyzed hydrolysis resulted in aldehyde epimerization during a kainic acid synthesis.  [c.302]

The most common gold compounds are auric chloride and chlorauric acid, the latter being used in photography for toning the silver image. Gold has 18 isotopes 198Au, with a half-life of 2.7 days, is used for treating cancer and other diseases. Disodium aurothiomalate is administered intramuscularly as a treatment for arthritis. A mixture of one part nitric acid with three of hydrochloric acid is called aqua regia (because it dissolved gold, the King of Metals). Gold is available commercially with a purity of 99.999+%. For many years the temperature assigned to the freezing point of gold has been 1063.0G this has served as a calibration point for the International Temperature Scales (ITS-27 and ITS-48) and the International Practical Temperature Scale (IPTS-48). In 1968, a new International Practical Temperature Scale (IPTS-68) was adopted, which demands that the freezing point of gold be changed to 1064.43G. The specific gravity of gold has been found to vary considerably depending on temperature, how the metal is precipitated, and cold-worked.  [c.143]

Potassium nitrate anticatalysed nitration in nitric acid (the solutions used also contained 2-5 mol 1 of water) but the effect was small in comparison with the corresponding effect in nitration in organic solvents ( 3.2.3 4), for the rate was only halved by the addition of 0-31 mol 1 of the salt. As in the case of the addition of sulphuric acid, the effect was not linear in the concentration of the additive, and the variation of k j with [KNOgj/mol 1 " was similar to that of with [H2SO4]/ mol 1.  [c.8]

N-Acetylglycine [543-24-8] M 117.1, m 206-208 , pKf-1.92, pKi 3.69. Treated with acid-washed charcoal and recrystd three times from water or EtOH/Et20 and dried in vacuo over KOH [King and King J Am Chem Soc 78 1089 1956],  [c.90]

See pages that mention the term Kainic acid : [c.539]    [c.550]    [c.551]    [c.463]    [c.463]    [c.276]    [c.388]    [c.214]    [c.22]    [c.119]    [c.30]    [c.90]    [c.225]    [c.55]    [c.564]    [c.451]    [c.323]    [c.10]    [c.43]    [c.456]    [c.168]    [c.211]    [c.486]    [c.713]    [c.359]    [c.1840]    [c.1874]    [c.63]    [c.163]   
The logic of chemical synthesis (1989) -- [ c.388 ]