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

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Established in 1960, Advances in Heterocyclic Chemistry is the definitive serial in the area-one of great importance to organic chemists, polymer chemists and many biological scientists. Written by established authorities in the field, the comprehensive reviews combine descriptive chemistry and mechanistic insight and yield an understanding of how the chemistry drives the properties. Established in 1960, Advances in Heterocyclic Chemistry is the definitive serial in the area-one of great importance to organic chemists, polymer chemists and many biological scientists. Written by established authorities in the field, the comprehensive reviews combine descriptive chemistry and mechanistic insight and yield an understanding of how the chemistry drives the properties.

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

Glycerol as eco-efficient solvent for organic transformations -- Aromatic bio-based solvents (alkylphenols, etc.) -- Solvents from wastes (in particular extractibles such as limonene and others) -- Deep eutectic and low melting mixtures -- Organic carbonates : promising reactive solvents for biorefineries and biotechnology -- Life cycle assessments for green solvents -- Alkylphenols as bio-based solvents : properties, manufacture, and applications

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 .

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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:

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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:

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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:

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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

Established in 1960, Advances in Heterocyclic Chemistry is the definitive serial in the area--one of great importance to organic chemists, polymer chemists, and many biological scientists. Written by established authorities in the field, the comprehensive reviews combine descriptive chemistry and mechanistic insight and yield an understanding of how the chemistry drives the properties.

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:

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Vols. for 1915-1956 include Proceedings of the Chemical Society, which resumed separate publication in 1957.

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:

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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

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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

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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 ...

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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

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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:

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Category:

Page: 288

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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:

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Category: Science

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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:

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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