Crown ether derivatives of L-(3,4-dihydroxyphenyl)alanine: crowned DOPA

1983 ◽  
pp. 10 ◽  
Author(s):  
Michele Berthet ◽  
Etienne Sonveaux
Keyword(s):  
Crown Ether ◽  
Derivatives Of

ChemInform Abstract: Crown Ether Derivatives of Tetrathiafulvalene. Part 1.

ChemInform ◽  
2010 ◽  
Vol 24 (14) ◽  
pp. no-no
Author(s):  
T. K. HANSEN ◽  
T. JORGENSEN ◽  
P. C. STEIN ◽  
J. BECHER
Keyword(s):  
Crown Ether ◽  
Derivatives Of

Effect of Crown Ether Macrocycle on the Methylation of the Thioamide Derivatives of Benzo-15-crown-5 and Veratrole.

ChemInform ◽  
2004 ◽  
Vol 35 (19) ◽  
Author(s):  
N. Zh. Sayfullina ◽  
A. K. Tashmukhamedova ◽  
Kh. M. Shakhidoyatov
Keyword(s):  
Crown Ether ◽  
Derivatives Of

scholarly journals Molecular cleft or tweezer compounds derived from trioxabicyclo[3.3.1]nonadiene diisocyanate and diacid dichloride

2015 ◽  
Vol 11 ◽  
pp. 1-8 ◽  
Author(s):  
Gert Kollenz ◽  
Ralf Smounig ◽  
Ferdinand Belaj ◽  
David Kvaskoff ◽  
Curt Wentrup
Keyword(s):  
Rare Earth ◽  
Crown Ether ◽  
Dft Calculations ◽  
Metal Ions ◽  
Rare Earth Metal ◽  
Alkaline Earth ◽  
Earth Metal ◽  
X Ray ◽  
X Ray Crystallography ◽  
Derivatives Of

The structures of two derivatives of the bisdioxine diisocyanate 1, the bisurea 4 and the biscarbamate 5, are established by X-ray crystallography and DFT calculations. These compounds possess endo,endo structures, in the case of the bisurea 4 with two nearly parallel pendant chains. The X-ray structures are reproduced very well by DFT calculations. Similar endo,endo conformations are calculated for the bisamide crown ether derivatives 7, where two proximate and nearly parallel crown ether units endow the molecules with a claw-like molecular cleft or tweezer structure as evidenced by an enhanced ability to extract some alkali, alkaline earth and rare earth metal ions.

Synthesis and characterisation of polyaza crown ether derivatives of calix[4]arene and their role as anion receptors

Tetrahedron ◽  
1997 ◽  
Vol 53 (13) ◽  
pp. 4669-4680 ◽  
Author(s):  
Teerapat Rojsajjakul ◽  
Sudarath Veravong ◽  
Gamolwan Tumcharern ◽  
Ratana Seangprasertkij-Magee ◽  
Thawatchai Tuntulani
Keyword(s):  
Crown Ether ◽  
Anion Receptors ◽  
Derivatives Of

Crystal structures of 1:1 complexes between urea and two crown ether derivatives of phthalic acid

1987 ◽  
Vol 5 (2) ◽  
pp. 165-168 ◽  
Author(s):  
Franco Benetollo ◽  
Gabriella Bombieri ◽  
Mary R. Truter
Keyword(s):  
Crown Ether ◽  
Crystal Structures ◽  
Phthalic Acid ◽  
Derivatives Of

scholarly journals Synthesis of selectively modified cellulose derivatives via reductive amination of 2-oxy- and 3-oxy-cellulose intermediates

1984 ◽  
Vol 62 (2) ◽  
pp. 260-262 ◽  
Author(s):  
Manssur Yalpani ◽  
Laurance D. Hall ◽  
Jacques Defaye ◽  
Andrée Gadelle
Keyword(s):  
Crown Ether ◽  
Reductive Amination ◽  
Ammonium Acetate ◽  
Water Soluble ◽  
Cellulose Derivatives ◽  
Oxidized Cellulose ◽  
Sodium Cyanoborohydride ◽  
Chromium Tricarbonyl ◽  
Derivatives Of ◽  
Modified Cellulose

Diamagnetic and paramagnetic amine derivatives of cellulose have been prepared from selectively oxidized cellulose precursors via the reductive amination method using sodium cyanoborohydride. 4-Amino-2,2,6,6-tetramethylpiperidine-1-oxyl was employed in the syntheses of nitroxide spin labelled cellulose derivatives 4 and 5 from 3-oxy-cellulose (1) and 6-O-triphenylmethyl-2-oxy-cellulose (2). Conversion of the linear polymer 1 into a highly branched, water soluble 3-deoxy-cellulose derivative 6 was accomplished by attachment of glucosamine side chains. 3-Amino-3-deoxy-cellulose 7 was obtained using ammonium acetate. A novel type of organometallic cellulose conjugate 8 was prepared by condensation of 2 and p-toluidine chromium tricarbonyl. Similarly, 1,10-diazo-18-crown-6 was added to 2 to form the crown ether derivative 9. The synthetic strategies involving either 6-O protected or unprotected oxy-cellulose intermediates are compared in terms of reaction yields and product properties.

Synthesis and binding investigations of novel crown-ether derivatives of phenanthro[4,5-abc]phenazine and quinoxalino[2′,3′:9,10]phenanthro[4,5-abc]phenazine

2013 ◽  
Vol 26 (1) ◽  
pp. 15-24 ◽  
Author(s):  
Fadi M. Jradi ◽  
Ala'a O. El-Ballouli ◽  
Mohammad H. Al-Sayah ◽  
Bilal R. Kaafarani
Keyword(s):  
Crown Ether ◽  
Derivatives Of
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