13148-65-7Relevant academic research and scientific papers
Synthesis of 1,3,4-Oxadiazoles from Carboxylic Hydrazides and of 1,2-Oxazin-6-ones from α-(Hydroxyimino)carboxylic Esters with Keteneylidene Triphenylphosphorane
L?ffler, Jonas,Schobert, Rainer
, p. 283 - 284 (1997)
In a one-pot procedure 1,3,4-oxadiazoles 8 are prepared from carboxylic hydrazides 2 and keteneylidene triphenylphosphorane 1 via an untypical intermolecular Wittig olefination of a carbamate type carbonyl group. Under similar conditions, reaction of 1 an
An efficient one pot synthesis of 1,3,4-oxadiazoles
Tandon,Chhor
, p. 1727 - 1732 (2001)
Various 1,3,4-oxadiazoles have been synthesized in excellent yields by BF3·Et2O promoted cyclodehydration of 1,2-diacyl and diaroyl hydrazines prepared in situ from corresponding acid chlorides and hydrazine.
A new synthesis of 1,3,4-oxadiazoles. Cyclization of N,N'- diacylhydrazines catalyzed by palladium(0)
Lutun, Stephane,Hasiak, Bruno,Couturier, Daniel
, p. 111 - 116 (2007/10/03)
Several 1,3,4-oxadiazoles were synthetized by cyclization of N,N'- diacylhydrazines catalyzed by palladium(0). Water formed during the reaction is responsible for the hydrolysis of the products. To avoid it, we introduced benzoic anhydride into the medium and obtained an increased yield of oxadiazoles.
TETRAZOLES IN THE SYNTHESES OF 1,3,4-OXADIAZOLES
Koldobskii, G. I.,Ivanova, S. E.
, p. 1512 - 1517 (2007/10/03)
Various variants of cleavage of tetrazoles to form 1,3,4-oxadiazoles are examined.The mechanisms and synthetic potentialities of these reactions are discussed.
DISILYLATED COMPOUNDS AS PRECURSORS OF HETEROCYCLES: A NEW AND EASY OXADIAZOLE SYNTHESIS
Rigo, Benoit,Fasseur, Dominique,Cauliez, Pascal,Couturier, Daniel
, p. 2321 - 2336 (2007/10/02)
Silyl diacylhydrazines have been synthesized.When they are treated with a slight amount of a variety of catalyst (nucleophiles, F-, true or Lewis acids, Pd, Pt...), 1,3,4-oxadiazoles are obtained.This cyclization can be performed in one step by
Azomethine dye derived from a compound having a pyrazolo triazole moiety
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, (2008/06/13)
An azomethine dye is derived from a pyrazolo triazolo coupler compound of general formula (I) and/or a polymer coupler having a repeating unit derived from a vinyl monomer containing in its molecule a moiety of general formula (I): where R1 and R2 are each H, halogen or a substituent; X is H, a halogen or a coupling releasable group; or R1, R2 or X may each be a simple bond or a linking group for forming a bis-coupler; or R1 or R2 may be a simple bond or a linking group through which the moiety of general formula (I) is bonded to the vinyl group of a vinyl monomer. 72 specific couplers are shown, and six synthesis methods. Color development produces good magenta image free from subsidiary yellow absorptions.
ACID CATALYZED CYCLIZATION OF BIS SILYL DIACYLHYDRAZINES : A NEW 1,3,4-OXADIAZOLE SYNTHESIS
Rigo, Benoit,Cauliez, Pascal
, p. 1247 - 1252 (2007/10/02)
Diacylhydrazines are converted in good yields into 1,3,4-oxadiazoles with dichlorodimethylsilane and trifluoromethane sulfonic acid.
Pyrazolo(1,5-B)-1,2,4-triazole derivatives
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, (2008/06/13)
A novel pyrazolo[1,5-b]-1,2,4-triazole derivative represented by the general formula (I) is described. STR1 wherein R1 and R2 which may be the same or different, each represents a hydrogen atom or a substituent; X represents a hydrogen atom or a group capable of being released upon coupling; and Y represents a hydrogen atom or an aralkyl group.
