Advances in Heterocyclic Chemistry
However, in the presence of base, the released urazole derivatives (pKa=4.3–5.3
) were obtained as salt that necessitated an acid work-up to get the final product
32 (Scheme 26) (2002TL3899). Scheme 26 Synthesis of 1,2,4-triazolidine-3 ...
Author: Alan R. Katritzky
Publisher: Academic Press
ISBN: 0123965322
Category: Science
Page: 231
View: 693
Bio Based Solvents
Shekouhy and co-workers [26] used the same reaction to synthesize simple
urazole derivatives within a short reaction ... urazole and an active methylene
compound (dimedone) in glycerol to produce 94% of the desired urazole
derivative (13).
Author: François Jerome
Publisher: John Wiley & Sons
ISBN: 1119065399
Category: Science
Page: 200
View: 475
Official Gazette of the United States Patent and Trademark Office
... HERBICIDE ANTIDOTES U.S. CI , 71–92 29 Claims Eugene G. Teach , El
Cerrito , Calif . , assignor to Stauffer Chemi1. 1,2 - Alkylene - 4 - substituted
urazole derivatives represented cal Company , Westport , Conn . by the formula
Filed Jun .
Author:
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Category: Patents
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Carbocyclic and heterocyclic series
They result on heating urea and its derivatives - e.g . , allophanic ester , biuret ,
etc. — with hydrazine salts : CÓ –NH , NH , .NH , CO –NH * NH_CO_NH , > NH (
+ 2NH4 ) NH_CO Biuret Urazole . Urazole , 3,5 - Diketotriazolidine , C , H , O , N3
...
Author: Victor von Richter
Publisher:
ISBN:
Category: Chemistry, Organic
Page:
View: 323
Victor Von Richter s Organic Chemistry Carbocyclic and heterocyclic series
The urazoles are the diketo - derivatives of tetrahydrotriazole . They result on
heating urea and its derivatives - e.g . , allophanic ester , biuret , etc. — with
hydrazine salts : CO –NH , NH . NH2 CO –NH NI - CO - NH , NH - CO > NH ( +
2NH ) ...
Author: Victor von Richter
Publisher:
ISBN:
Category: Chemistry, Organic
Page:
View: 825
Victor Von Richter s Organic Chemistry
CO –NH , NH - CO - NH , The urazoles are the diketo - derivatives of
tetrahydrotriazole . They result on ... Urazole , 3,5 - Diketotriazolidine , C , H , O ,
Ng , melting at 244 ° , is obtained from hydrazodicarbonamide , NH ,. CO.NH. NH
. CO .
Author: Victor von Richter
Publisher:
ISBN:
Category: Chemistry, Organic
Page:
View: 431
Advances in Heterocyclic Chemistry
Starting substituted urazoles are often readily available by simple nucleophilic
substitution reactions of urazoles with ... 505, and 507 trapped with alcohols give
the corresponding urazole derivatives, which can be further hydrolyzed to 4Et Et
...
Author:
Publisher: Academic Press
ISBN: 9780080576541
Category: Science
Page: 438
View: 905
Journal of the Chemical Society
Urazole , derivatives of ( CUNEO ) , A. , i , 9 . Urceolaria scruposa and U.
cretacea , constituents of ... Urethane , nitroso- , and its methyl derivative ,
constitution of ( BRÜHL ) , A. , i , 871 . Urethanes , preparation of , and action of
nitrous acid on ...
Author: Chemical Society (Great Britain)
Publisher:
ISBN:
Category: Chemistry
Page:
View: 768
Journal Chemical Society London
Urazole , derivatives of ( CUNEO ) , A. , i , 9 . Urccolaria scruposa and U. cretacca
, constituents of ( HESSE ) , A. , i , 383 . Urea ( carbamide ) , amount of , in various
animal tissues and liquids ( SchönDORFF ) , A. , ii , 373 . origin of , from ...
Author: Chemical Society (Great Britain)
Publisher:
ISBN:
Category: Chemistry
Page:
View: 887
Indian Journal of Chemistry
Some urazole derivatives 1 were found to be potent cytotoxic agents in murrain
and human cancer cell lines and also reduce DNA synthesis significantly with
moderate reduction in RNA synthesis . Kinetic studies suggest that the
inhibitation of ...
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Category: Chemistry
Page:
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Journal of the Indian Chemical Society
A new method for the preparation of urazole derivatives has been found in the
action of ethyl carbethoxythiocarbamate on hydrazine and phenylhydrazine : the
reactions evidently proceed , thus : OEt NH , HS - G . NH - C . OEt NH - COH ĐN ...
Author: Indian Chemical Society
Publisher:
ISBN:
Category: Chemistry
Page:
View: 301
Journal of the Chemical Society
Urazole decomposes carbonates and reddens litmus . The ammonio - derivative ,
C20 , N H NH , , is obtained in colourless crystals , and gives off ammonia at 100°
. The argento - compound is an amorphous , white powder , whilst the barium ...
Author: Chemical Society (Great Britain)
Publisher:
ISBN:
Category: Chemistry
Page:
View: 478
Derwent Commonwealth Patents Report
49906/59 : URAZOLE DERIVATIVES Abbott Laboratories . 18.6.59 , clg . 25.6.58
( USA ) 13pp . New cpds . of general formula R " 1 N. O R - N - N - R ' ( where R
and R ' are lower alkyl ; and R " is H or CH3 ) : Specific cpds . claimed are 1 : 2 ...
Author:
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Journal of the Indian Institute of Science
A new method for the preparation of urazole derivatives has been found in the
action of ethyl carbethoxythiocarbamate on hydrazine and phenylhydrazine : the
reactions evidently proceed thus : OEt NH , HS - C NH - C . OEt NH - 1 : 0H >
NHK ...
Author: Indian Institute of Science, Bangalore
Publisher:
ISBN:
Category: Chemistry, Organic
Page:
View: 305
The Journal of Pharmacology and Experimental Therapeutics
Structures or VRAZOLE DERIVATIVES OC CHO Ry - N - N - Nz dose regression
line , the determination of the ED50 ' s ... Structures of urazole derivatives . mately
80 % of our control Rockland strain mice , as compared to less than 5 % of CF ...
Author:
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Category: Pharmacology
Page:
View: 826
Stabilization of Photographic Silver Halide Emulsions
Since urazole reacts with gelatin hardening agents of the aldehyde type , other
hardening agents not of this type are required for these emulsions . According to
Kodak ( P449 ) urazole derivatives such as 4 - phenyl - urazole , 4 - ethyl -
urazole ...
Author: E. J. Birr
Publisher:
ISBN:
Category: Photographic emulsions
Page: 275
View: 668
Alternatives to Uracil in the Pre RNA World
The proton chemical shifts of the reaction mixture of urazole and acetaldehyde in
D20 are shown in Table 4 . 4 ; shifts are in ppm and coupling ... an equivalent of.
Monoadduct 5 . 5 ( t 6 . 4 ) ( m ) 1987 ) , so much so that urazole derivatives ( 73.
Author: Jason P. Dworkin
Publisher:
ISBN:
Category:
Page: 288
View: 920
Scientific Activities
1 Technical assistant Metalloid derivatives for organic synthesis : preparation of
urazole and thiourazole derivatives A. Shanzer and S. Rubinraut ? Silicon
isocyanates are introduced as reagents and covalent templates for the
preparation of ...
Author: Mekhon Ṿaitsman le-madaʻ
Publisher:
ISBN:
Category: Science
Page:
View: 274
American Chemical Journal
23 , 5 - Hydroxyuracil , sulphur derivatives of : preparation of 5 -
benzylmercaptouracil and 5 - benzylmercaptocytosine . ... 42 , - ( isobarbituric
acid ) , syntheses of new derivatives of . ... Imidothiobiazoline and urazole
derivatives , on some .
Author: Ira Remsen
Publisher:
ISBN:
Category: Chemistry
Page:
View: 113
Comprehensive Heterocyclic Chemistry II
The H ( 1 ) ( 2 ) and H ( 4 ) protons of urazole in this medium are of comparable
acidity and the pK , is 13.1 . The N ( 1 ) and N ( 4 ) phenyl and methyl derivatives
are more acidic , both substituent groups having surprisingly similar effects ...
Author: Alan R. Katritzky
Publisher:
ISBN: 9780080427270
Category: Heterocyclic chemistry
Page: 1006
View: 448
