Syntheses and properties of H-1,2,3-triazoles

Tanaka, Yoshinari; VELEN, S. R.; Miller, Sidney I.

doi:10.1016/s0040-4020(01)93480-5

Cited by 56 publications

(18 citation statements)

References 34 publications

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“…The methyl 1,2,3-triazole 4,5-dicarboxylate 1 [2] underwent a methylation reaction with dimethyl sulphate in methyl ethyl ketone in the presence of anhydrous sodium carbonate (Scheme 1).…”

Section: Introductionmentioning

confidence: 99%

New 1,2,3‐triazolo[4,5‐d]1,2,4‐triazolo[3,4‐b]pyridazine derivatives II

Biagi

Ciambrone

Giorgi

et al. 2002

Journal of Heterocyclic Chem

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New tricyclic 1,2,3-triazolo-1,2,4-triazolo-pyridazine derivatives, bearing a methyl substituent on the 1,2,3-triazole ring, were prepared as potential biological agents. N-Methylation of dimethyl 1,2,3-triazole-4,5-dicarboxylate allowed synthesis of the isomeric 1-methyl-4,7-dihydroxy and 2-methyl-4,7-dihydroxy triazolo-pyridazines 4a and 4b which, by a chlorination reaction, gave the corresponding 1-methyl-4-chloro-(6a), 1-methyl-7-chloro-(6b) and 2-methyl-4-chloro-(9) substituted 1,2,3-triazolo-pyridazines. The nucleophilic substitution with hydrazine hydrate and the suitable cyclization to form the 1,2,4-triazole ring, provided the expected tricyclic isomeric derivatives 8a, 8b and 11 respectively. The p-methoxybenzyl substituent, introduced as a leaving group to obtain either v-triazolo-pyridazine or v-triazolo-s-triazolo-pyridazine derivatives unsubstituted on the 1,2,3-triazole ring, appeared inadequate. Some compounds underwent binding assays toward the adenosine A 1 and A 2A receptors.

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“…The methyl 1,2,3-triazole 4,5-dicarboxylate 1 [2] underwent a methylation reaction with dimethyl sulphate in methyl ethyl ketone in the presence of anhydrous sodium carbonate (Scheme 1).…”

Section: Introductionmentioning

confidence: 99%

New 1,2,3‐triazolo[4,5‐d]1,2,4‐triazolo[3,4‐b]pyridazine derivatives II

Biagi

Ciambrone

Giorgi

et al. 2002

Journal of Heterocyclic Chem

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“…[331,[451][452][453][454][455] Tributyltin and triphenyllead azides have been shown to undergo [3+2]-cycloaddition particularly with the electron-poor C 2 (CO 2 Me) 2 . [456,457] In contrast to previous assumptions, here the tin atom is attached to N 2 .…”

Section: Reactions Of Main Group Element Azides With Alkynesmentioning

confidence: 99%

Azide Chemistry – An Inorganic Perspective, Part II^[‡][3+2]‐Cycloaddition Reactions of Metal Azides and Related Systems

Fehlhammer

Beck

2015

Zeitschrift anorg allge chemie

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Abstract. In whatever state of bonding -whether covalent to an organic residue or a heteroatom, or polar to ionic in contact with a metal -the azide moiety N 3 is characterized by its high potential of reactivity which essentially manifests itself in two basic processes: the elimination of dinitrogen and the entry into 1,3-dipolar cycloadditions with suitable dipolarophiles, the latter of which clearly predominates the chemistry of azide, also that of its metal compounds. In a preceding review entitled "Part I -Metal Azides: Overview, General Trends and Recent Developments" which was meant to lay the foundations for the present paper, these and other reactions have already been touched upon. The present review -Part II -now focusses in great detail on the formation of five-membered heterocyclestetrazol(at)es, triazol(at)es, triazolin(at)es, thiatriazol(at)es, etc. as well as various consecutive products -from azide and nitriles, isocyanides, alkynes, alkenes and heteroallenes (CS 2 , RN=C=S) in the ligand sphere of the metal. Generally, these [3+2]-cycloadditions are found to CONTENTS

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“…Skillful practices are needed to determine the absolute calibration values by using an approximate gain of the antenna based on radar and communication techniques, together with an approximate sensitivity derived from experiments with limited accuracy. It is still a difficult problem and usually only applied to polarimeters (Broten & Medd (1960); Findlay (1966); Tanaka et al (1973); etc).…”

Section: Introductionmentioning

confidence: 99%

“…He presented a complete analysis of the quiet-Sun radio radiation, and the result is consistent with the observations at wavelengths of 3 cm, 10 cm, 25 cm, 50 cm, 60 cm, 1.5 m & 3.5 m (Pawsey & Yabsley (1949); Christiansen & Hindman (1951)). Since then, more and more observations and studies have been published (Allen (1957); Tanaka et al (1973); Bastian et al (1996)). Kundu (1965) reviewed the basic theory of radiative transform and propagation in solar radio astrophysics.…”

Section: Introductionmentioning

confidence: 99%

“…Kundu (1965) reviewed the basic theory of radiative transform and propagation in solar radio astrophysics. Tanaka et al (1973) used the average value of the daily noon flux to obtain the radio flux spectrum of the quiet-Sun. Other works (Nelson et al (1985); Zirin et al (1991)) used the flux density of the quiet-Sun around the minimum of the solar cycle.…”

Section: Introductionmentioning

confidence: 99%

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Study of Calibration of Solar Radio Spectrometers and the Quiet-Sun Radio Emission

Tan

Yan

et al. 2015

ApJ

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This work presents a systematic investigation of the influence of weather conditions on the calibration errors by using Gaussian fitness, least chi-square linear fitness and wavelet transform to analyze the calibration coefficients from observations of the Chinese Solar Broadband Radio Spectrometers (at frequency bands of 1.0-2.0 GHz, 2.6-3.8 GHz, and 5.2-7.6 GHz) during 1997-2007. We found that calibration coefficients are influenced by the local air temperature. Considering the temperature correction, the calibration error will reduce by about 10% − 20% at 2800 MHz. Based on the above investigation and the calibration corrections, we further study the radio emission of the quiet-Sun by using an appropriate hybrid model of the quiet-Sun atmosphere. The results indicate that the numerical flux of the hybrid model is much closer to the observation flux than that of other ones.

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Syntheses and properties of H-1,2,3-triazoles

Cited by 56 publications

References 34 publications

New 1,2,3‐triazolo[4,5‐d]1,2,4‐triazolo[3,4‐b]pyridazine derivatives II

New 1,2,3‐triazolo[4,5‐d]1,2,4‐triazolo[3,4‐b]pyridazine derivatives II

Azide Chemistry – An Inorganic Perspective, Part II^[‡][3+2]‐Cycloaddition Reactions of Metal Azides and Related Systems

Study of Calibration of Solar Radio Spectrometers and the Quiet-Sun Radio Emission

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Syntheses and properties of H-1,2,3-triazoles

Cited by 56 publications

References 34 publications

New 1,2,3‐triazolo[4,5‐d]1,2,4‐triazolo[3,4‐b]pyridazine derivatives II

New 1,2,3‐triazolo[4,5‐d]1,2,4‐triazolo[3,4‐b]pyridazine derivatives II

Azide Chemistry – An Inorganic Perspective, Part II[‡][3+2]‐Cycloaddition Reactions of Metal Azides and Related Systems

Study of Calibration of Solar Radio Spectrometers and the Quiet-Sun Radio Emission

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Azide Chemistry – An Inorganic Perspective, Part II^[‡][3+2]‐Cycloaddition Reactions of Metal Azides and Related Systems