A Novel Migrative Addition Reaction of Hydrazines to the Diketone Derivatives of C60.

ChemInform ◽  
2003 ◽  
Vol 34 (34) ◽  
Author(s):  
Sho-ichi Iwamatsu ◽  
Fumiaki Ono ◽  
Shizuaki Murata
Keyword(s):  
Addition Reaction ◽  
Derivatives Of

scholarly journals 1H and 13C Nuclear Magnetic Resonance Spectroscopy of Some Derivatives of Nitro Sugars

1973 ◽  
Vol 51 (11) ◽  
pp. 1797-1800 ◽  
Author(s):  
N. Gurudata ◽  
F. J. M. Rajabalee
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Shift ◽  
Magnetic Resonance Spectroscopy ◽  
Nuclear Magnetic Resonance Spectroscopy ◽  
Addition Reaction ◽  
Chemical Shifts ◽  
Resonance Spectroscopy ◽  
13C Nuclear Magnetic Resonance ◽  
Derivatives Of

Eight 2,3-dideoxy-2-amino-3-nitrosugar derivatives have been obtained by an elimination–addition reaction on the α and β anomers of methyl-4,6-O-benzylidene-3-deoxy-3-nitro-glucopyranoside-2-acetate. P.m.r. is used to show that the compounds exist in the CE conformation. 13C.m.r. data are presented for three anomeric pairs. Trends in the C-13 chemical shifts are found to be similar to those reported in other studies of carbohydrates. Exceptions in direction and magnitude of chemical shift differences are discussed.

Topochemische Reaktionen von Monomeren mit konjugierten Dreifachbindungen / Tochemical Reactions of Monomers with conjugated triple Bonds

1969 ◽  
Vol 24 (7) ◽  
pp. 824-832 ◽  
Author(s):  
Gerhard Wegner
Keyword(s):  
Solid State ◽  
Addition Reaction ◽  
Kcal Mole ◽  
Triple Bonds ◽  
Qualitative Survey ◽  
Polymer Formation ◽  
Functional Derivatives ◽  
Solid State Polymerization ◽  
Topotactic Reaction ◽  
Derivatives Of

The solid-state polymerization of functional derivatives of 2,4-hexadiin-1,6-diol caused by light or by heat was investigated. A qualitative survey demonstrates that the presence of groups capable of hydrogen-bonding are one of the most important factors for solid-state reactivity of conjugated triple-bonds. Compounds which do not form hydrogen-bonds were unreactive in most cases. Urethanes were the most reactive class of derivatives, 2,4-hexadiin-1,6-diol-bis-phenylurethane giving the best results. The relation and the reactivity of several modifications of this compound are described. Heating of one modification of 2,4-hexadiin-1,6-diol-bis-phenylurethane at temperatures between 70 and 120°C yielded in a topotactic reaction highly crystalline fibres of a coppercoloured polymer. Time-conversion studies were made and the activation energy of the polymerization determined to 19 kcal/mole. The mechanism of polymer-formation is discussed. It is highly probable that poly-1,4-bis-phenylcarbamoyloxymethyl-trans-butatrien, a polymer with three cumulated double-bonds per repeating-unit, is formed by a 1,4-addition reaction.

Proline-Glycine Dipeptidic Derivatives of Chiral Phosphoramides as Organocatalysts for the Enantiodivergent Aldol Reaction of Aryl Aldehydes and Isatins with Cyclohexanone in the Presence of Water

Synthesis ◽  
2018 ◽  
Vol 50 (17) ◽  
pp. 3445-3459 ◽  
Author(s):  
Eusebio Juaristi ◽  
Carlos Cruz-Hernández ◽  
Perla Hernández-González
Keyword(s):  
Addition Reaction ◽  
Present Report ◽  
Primary Amines ◽  
Bond Forming ◽  
Chiral Compounds ◽  
Aryl Aldehydes ◽  
Detailed Evaluation ◽  
Aldol Addition ◽  
Derivatives Of ◽  
Selection Of

The synthesis of several novel organocatalysts derived from (R)- and (S)-proline-glycine dipeptides and incorporating a chiral phosphoramide fragment was accomplished. These chiral compounds catalyze the enantioselective aldol addition reaction of cyclohexanone to prochiral aryl aldehydes and isatins in the presence of water. These chiral organocatalysts represent some of the few proline-derived compounds capable to catalyze aldol-type addition of cyclohexanone to isatins, a C–C bond forming transformation for which chiral primary amines are usually more successful. Additionally, these phosphoramide-containing catalysts afforded excellent results in the addition of cyclohexanone to aryl aldehydes, as anticipated by the presence of the proline moiety. The present report includes a detailed evaluation of the new multifunctional catalysts that are able to afford either enantiomer of the chiral product by adequate selection of the configuration of the proline residue.

scholarly journals METACHROMATIC STAINING OF SODIUM BISULFITE ADDITION DERIVATIVES OF GLYCOGEN

1970 ◽  
Vol 18 (11) ◽  
pp. 834-841 ◽  
Author(s):  
GEORGE I. MALININ
Keyword(s):  
Cell Cultures ◽  
Toluidine Blue ◽  
Addition Reaction ◽  
Periodic Acid ◽  
Sodium Bisulfite ◽  
Ph Range ◽  
Derivatives Of ◽  
External Glucose

In fixed tissues and cell cultures glycogen readily formed sodium bisulfite addition compounds following oxidation with 0.5% aqueous periodic acid. Sodium bisulfite derivatives of oxidized glycogen developed intense metachromasia if stained with 0.5% toluidine blue at the 1.0-5.0 pH range. Induced metachromasia of tissue glycogen was dehydration-labile if the oxidation with periodic acid was carried out for less than 15 min. Oxidation in excess of 15 min resulted in formation of dehydration-resistant metachromasia. The induction of the two types of metachromasia was determined primarily by the duration of oxidation and only secondarily by the duration of addition reaction and sodium bisulfite concentration. The origin of the dehydration-labile metachromasia probably resides with the external glucose units of glycogen depositions, whereas the induction of dehydration-resistant metachromasia may be attributed to the sodium bisulfite derivatives of the internally located glucosyl groups of glycogen.

ChemInform Abstract: Oxidative Addition Reaction of Disulfides, e.g. (II), with Organometallic Derivatives of Monovalent Gold, e.g. (I), (VI).

ChemInform ◽  
2010 ◽  
Vol 22 (11) ◽  
pp. no-no
Author(s):  
V. P. DYADCHENKO ◽  
K. I. GRANDBERG ◽  
O. N. KALININA ◽  
P. E. KRASIK ◽  
O. YU. BURTSEVA ◽  
...  
Keyword(s):  
Addition Reaction ◽  
Oxidative Addition ◽  
Derivatives Of ◽  
Oxidative Addition Reaction

3,4-Disubstituted derivatives of 1,2,5-thiadiazole 1,1-dioxide. Ethanol addition reactions and electroreduction of 3-methyl-4-phenyl and 3,4-dimethyl derivatives in acetonitrile and ethanol solvents

1996 ◽  
Vol 74 (8) ◽  
pp. 1564-1571 ◽  
Author(s):  
José Alberto Caram ◽  
María Virginia Mirífico ◽  
Silvia Lucía Aimone ◽  
Enrique Julio Vasini
Keyword(s):  
Nmr Spectroscopy ◽  
Addition Reaction ◽  
Uv Spectroscopy ◽  
Equilibrium Constants ◽  
Addition Reactions ◽  
Solvent Mixtures ◽  
Second Order Reaction ◽  
Ethanol Addition ◽  
Derivatives Of ◽  
C Nmr

3-Methyl-4-phenyl-1,2,5-thiadiazole 1,1-dioxide (TMP), as well as 3,4-dimethyl-1,2,5-thiadiazole 1,1-dioxide (TMM), react with ethanol (EtOH), which adds to one of their C = N double bonds. The equilibrium constants for the addition reaction are measured in mixed acetonitrile (ACN) – EtOH solvents by means of UV spectroscopy in the case of TMP, and by 13C NMR spectroscopy in the case of TMM, since TMM presents only terminal UV absorption. Both equilibrium constants are also estimated through cyclic voltammetry (CV) experiments. In the case of TMP, the ethanol molecule adds to the C = N bond located on the methyl-substituted side of the substrate, according to 13C NMR spectroscopy and CV results. The electroreduction characteristics of the substrates and their ethanol addition products are studied using CV techniques in ACN, EtOH, and CAN–EtOH solvent mixtures. The radical anion formed by the first electron transfer to TMM is unstable and decomposes rapidly while that corresponding to TMP undergoes a relatively slow homogeneous second-order reaction with the substrate (k = 3 × 102 M−1 s−1). The equilibrium constant for EtOH addition and the voltammetric properties of the substrates are compared with those of the previously studied 3,4-diphenyl derivative (TPP). Key words: electrochemistry, thiadiazoles, structure–reactivity relations, kinetics.

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