ChemInform Abstract: Preparation of Monomethyl Ether Derivatives of (+)-, (-)- and (.+-.)- Indenestrols A and B.

ChemInform ◽  
2010 ◽  
Vol 25 (19) ◽  
pp. no-no
Author(s):  
T. ODA ◽  
Y. SATO
Keyword(s):  
Monomethyl Ether ◽  
Derivatives Of

Monomethyl ether derivatives of 7,8-dihydroxy- and 8,9-dihydroxy-4-propyl-1,2,3,4,4a,5,6,10b-octahydrobenzo[f]quinolines as possible products of metabolism by catechol-O-methyltransferase

1990 ◽  
Vol 33 (7) ◽  
pp. 2000-2006 ◽  
Author(s):  
Joseph G. Cannon ◽  
Kathleen A. Walker ◽  
Antonio Montanari ◽  
John Paul Long ◽  
Jan R. Flynn
Keyword(s):  
Monomethyl Ether ◽  
Derivatives Of

SOME METHYL ETHERS AND ACETATES OF PURPUROGALLIN

1952 ◽  
Vol 30 (4) ◽  
pp. 251-256
Author(s):  
G. Denis Thorn ◽  
L. R. C. Barclay
Keyword(s):  
Absorption Spectra ◽  
Dimethyl Ether ◽  
Monomethyl Ether ◽  
Ultraviolet Absorption ◽  
Derivatives Of

The preparation and ultraviolet absorption spectra of a number of methyl ethers and acetates of purpurogallin are given. The following derivatives of purpurogallin are, to our knowledge, not mentioned in the literature: a mono-acetate, m.p. 182-183 °C.; a diacetate I, m.p. 159–160 °C; a diacetate II, m.p. 208–209 °C.; a triacetate, m.p. 161.5–162.5 °C.; a monomethyl ether diacetate, m.p. 156–157 °C.; a dimethyl ether diacetate, m.p. 194-196 °C. Comparison of the ultraviolet absorption spectra with those determined for derivatives of known structure suggested the positions of the acetyl groups in the new substances now prepared.

Notizen: Synthese strukturisomerer Dihydroxiderivate von Dibenzo-18-krone-6/Synthesis of Isomeric Dihydroxy Derivatives of Dibenzo-18-crown-6

1984 ◽  
Vol 39 (4) ◽  
pp. 542-544 ◽  
Author(s):  
Bernd Rieckemann ◽  
Klaus-B. Ebhardt ◽  
Fritz Umland
Keyword(s):  
Acetic Acid ◽  
Sulfuric Acid ◽  
Ethylene Glycol ◽  
Catalytic Reduction ◽  
Monomethyl Ether ◽  
Diazonium Salts ◽  
Ethylene Glycol Monomethyl Ether ◽  
Glycol Monomethyl Ether ◽  
Dilute Sulfuric Acid ◽  
Derivatives Of

In 1967 Pedersen described dibenzo-18-crown-6 (1) [1]. We report the preparation of its isomeric dihydroxy derivatives 2c and 3c. Nitration of 1 in acetic acid and chloroform yields the dinitro compounds 2a and 3a. 2a and 3a have different solubility in ethylene glycol monomethyl ether and can be separated [4]. Catalytic reduction of the dinitro derivatives with hydrazine and Raney nickel leads to the diamines 2b and 3b. The diazonium salts of 2b and 3 b are heated in dilute sulfuric acid and yield the phenols 2c and 3c.

scholarly journals A Family of Externally-Functionalised Coordination Cages

Chemistry ◽  
2021 ◽  
Vol 3 (4) ◽  
pp. 1203-1214
Author(s):  
Garrett D. Jackson ◽  
Max B. Tipping ◽  
Christopher G. P. Taylor ◽  
Jerico R. Piper ◽  
Callum Pritchard ◽  
...  
Keyword(s):  
Binding Constants ◽  
Monomethyl Ether ◽  
Terminal Alkyne ◽  
Bridging Ligands ◽  
Diverse Range ◽  
Exterior Surface ◽  
Click Reactions ◽  
Coordination Cages ◽  
Synthetic Routes ◽  
Derivatives Of

New synthetic routes are presented to derivatives of a (known) M8L12 cubic coordination cage in which a range of different substituents are attached at the C4 position of the pyridyl rings at either end of the bis(pyrazolyl-pyridine) bridging ligands. The substituents are (i) –CN groups (new ligand LCN), (ii) –CH2OCH2–CCH (containing a terminal alkyne) groups (new ligand LCC); and (iii) –(CH2OCH2)3CH2OMe (tri-ethyleneglycol monomethyl ether) groups (new ligand LPEG). The resulting functionalised ligands combine with M2+ ions (particularly Co2+, Ni2+, Cd2+) to give isostructural [M8L12]16+ cage cores bearing 24 external functional groups; the cages based on LCN (with M2+ = Cd2+) and LCC (with M2+ = Ni2+) have been crystallographically characterised. The value of these is twofold: (i) exterior nitrile or alkene substituents can provide a basis for further synthetic opportunities via ‘Click’ reactions allowing in principle a diverse range of functionalisation of the cage exterior surface; (ii) the exterior –(CH2OCH2)3CH2OMe groups substantially increase cage solubility in both water and in organic solvents, allowing binding constants of cavity-binding guests to be measured under an increased range of conditions.

Excess molar enthalpies of mixtures of methyl derivatives of polyethylene glycol with 1-alkanol at 298.15 K and 101.3 kPa

2002 ◽  
Vol 80 (5) ◽  
pp. 462-466 ◽  
Author(s):  
M EF de Ruiz Holgado ◽  
J Fernandez ◽  
M I Paz Andrade ◽  
E L Arancibia
Keyword(s):  
Polyethylene Glycol ◽  
Atmospheric Pressure ◽  
Excess Enthalpy ◽  
Monomethyl Ether ◽  
Excess Molar Enthalpies ◽  
Tetraethylene Glycol ◽  
Calvet Microcalorimeter ◽  
Methyl Derivatives ◽  
Experimental Values ◽  
Derivatives Of

Excess molar enthalpies (H E) of the binary mixtures containing tetraethylene glycol dimethyl ether (TEGDME) or polyethylene glycol 350 monomethyl ether with a 1-alkanol (1-propanol, 1-butanol, or 1-pentanol) at 298.15 K and atmospheric pressure were measured using a Calvet microcalorimeter. All the H E experimental values were positive and increase as the 1-alkanol length increases. The results are discussed qualitatively in terms of molecular interactions. The UNIFAC and DISQUAC group contribution models have been used to compare the predicted and the experimental values.Key words: excess enthalpy, 1-alkanol, polyether, binary system.

Regiospecific synthesis of quinizarin and naphthazarin derivatives by cycloaddition

1982 ◽  
Vol 35 (10) ◽  
pp. 2095 ◽  
Author(s):  
DW Cameron ◽  
GI Feutrill ◽  
PG Mckay
Keyword(s):  
Dimethyl Ether ◽  
Monomethyl Ether ◽  
Analogous Reaction ◽  
Derivatives Of ◽  
Benzenoid Ring

The diene (E)-1,1,4-trimethoxybuta-1,3-diene underwent regiospecific cycloaddition to derivatives of 2(3)-chloro-1,4-naphthoquinone. The resulting adducts were aromatized to give 1,4-dioxygenated anthraquinones. The latter were obtained as derivatives of quinizarin dimethyl ether or of quinizarin monomethyl ether depending on the conditions of aromatization. Cycloaddition of the diene to non-halogenated naphthoquinones proceeded similarly, orientation being controlled by substituents in the benzenoid ring. Analogous reaction of the diene with benzoquinones gave 5,8-dioxygenated naphthoquinones (naphthazarins), generally in limited yield. The procedure has been applied to synthesis of the mould metabolites helminthosporin and cynodontin.

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