One-step synthesis of garlic peel derived biochar by concentrated sulfuric acid: Enhanced adsorption capacities for Enrofloxacin and interfacial interaction mechanisms

Synthesis of amyl vanillyl ether from vanillin was carried out by two different methods, two-steps reaction method and one-step reaction method. In two-steps reaction method beginning with the first stage reduction of vanillin with NaBH4 to obtain vanillyl alcohol. Then, dehydration vanillyl alcohol and amyl alcohol with concentrated sulfuric acid. Synthesized compound were identification by TLC, IR spectroscopy and GCMS. In one step reaction method the vanillyl alcohol as a result of reduction of vanillin with NaBH4 are not isolated in advance, immediately reacted with amyl alcohol to form amyl vanillyl ether compound with concentrated HCl dehydrator. The results of two-steps reaction method showed that the reduction reaction of vanillin with NaBH4 produced vanillyl alcohol. Vanillyl alcohol compound that produced is white powder and yield 41.28%. Vanillyl amyl ether compound could not synthesis by dehydration from vanillyll alcohol from reduction of vanillin and amyl alcohol. Ether compound from dehydration of vanillyl alcohol from reduction of vanillin and amyl alcohol is diamyl ethers. Method one reaction step successfully synthesized amyl vanilil ether compound. Amyl vanilil ether compound that produced is liquid, colorless and yield 86.42%. Keywords: amyl vanillil ether, vanillin, vanillil alcohol, amyl alcohol

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Gallium Arsenide Integrated Circuits Decapsulation Technique Using Mixed Acid Chemistry For Die-Level Failure Analysis

10.31399/asm.cp.istfa2018p0496 ◽

2018 ◽

Author(s):

Harold Jeffrey M. Consigo ◽

Ricardo S. Calanog ◽

Melissa O. Caseria

Keyword(s):

Gallium Arsenide ◽

Sulfuric Acid ◽

Nitric Acid ◽

Integrated Circuits ◽

Failure Analysis ◽

Mixed Acid ◽

Optimum Parameters ◽

Plastic Package ◽

Fuming Nitric Acid ◽

Concentrated Sulfuric Acid

Abstract Gallium Arsenide (GaAs) integrated circuits have become popular these days with superior speed/power products that permit the development of systems that otherwise would have made it impossible or impractical to construct using silicon semiconductors. However, failure analysis remains to be very challenging as GaAs material is easily dissolved when it is reacted with fuming nitric acid used during standard decapsulation process. By utilizing enhanced chemical decapsulation technique with mixture of fuming nitric acid and concentrated sulfuric acid at a low temperature backed with statistical analysis, successful plastic package decapsulation happens to be reproducible mainly for die level failure analysis purposes. The paper aims to develop a chemical decapsulation process with optimum parameters needed to successfully decapsulate plastic molded GaAs integrated circuits for die level failure analysis.

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PRODUCTION OF SULFOCATIONITE BY MODIFICATION OF NATURAL COAL WITH CONCENTRATED SULFURIC ACID

SERIES CHEMISTRY AND TECHNOLOGY ◽

10.32014/2020.2518-1491.50 ◽

2020 ◽

Vol 3 (441) ◽

pp. 104-109

Author(s):

N.A. Bektenov ◽

◽

N.C. Murzakassymova ◽

M.A. Gavrilenko ◽

А.N. Nurlybayeva ◽

...

Keyword(s):

Sulfuric Acid ◽

Concentrated Sulfuric Acid ◽

Natural Coal

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Addition of primary alcohols to 3-chlorononafluoro-1,5-hexadiene and perfluoro-1,3,5-hexatriene

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19851714 ◽

1985 ◽

Vol 50 (8) ◽

pp. 1714-1726 ◽

Cited By ~ 3

Author(s):

Václav Dědek ◽

Igor Linhart ◽

Milan Kováč

Keyword(s):

Sulfuric Acid ◽

Primary Alcohols ◽

Principal Product ◽

Allyl Rearrangement ◽

Concentrated Sulfuric Acid ◽

Sodium Alkoxide

Sodium alkoxide-catalyzed addition of methanol, ethanol and propanol to 3-chlorononafluoro-1,5-hexadiene (I) proceeds at temperatures -35 °C to 8 °C with allyl rearrangement, affording 1,6-dialkoxy-1,1,2,3,4,4,5,6,6-octafluoro-2,4-hexadiene (V) as the principal product, along with 1,6-dialkoxy-1,2,3,3,4,5,6,6-octafluoro-1,5-diene (VI) and trans-1,6-dialkoxy-1,1,2,3,4,4,5,6,6-nonafluoro-2-hexene (VII). The ethers Va-Vc consist of the cis,trans- and trans,trans-isomers in about 3 : 1 ratio, whereas the ethers VIa-VIc have trans,trans-configuration. Ethers Vc and VIc react with concentrated sulfuric acid to give dipropyl 2,3,4,5-tetrafluoro-2,4-hexadienedioate (IX) and dipropyl 2,3,4,4,5-pentafluoro-2-hexenedioate (X), respectively, whereas the ether VIIc affords a mixture of propyl 6-propyloxy-2,3,4,4,5,6-heptafluoro-2-hexenoate (XI) and ester X. Addition of methanol to perfluoro-1,3,5-hexatriene (II) affords 1,1,2,3,4,5,6,6-octafluoro-1,6-dimethoxy-3-hexene (XIII) as the principal product.

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ChemInform Abstract: ADAMANTANE AND ITS DERIVATIVES PART 30, ON REACTIONS OF 2-METHYL-ADAMANTANE IN CONCENTRATED SULFURIC ACID

Chemischer Informationsdienst ◽

10.1002/chin.197519181 ◽

1975 ◽

Vol 6 (19) ◽

pp. no-no

Author(s):

S. LANDA ◽

J. HLAVATY

Keyword(s):

Sulfuric Acid ◽

Concentrated Sulfuric Acid

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4,5,6-Trichloropyrimidine-2-carboxamide

Molbank ◽

10.3390/m1190 ◽

2021 ◽

Vol 2021 (1) ◽

pp. M1190

Author(s):

Andreas S. Kalogirou ◽

Panayiotis A. Koutentis

Keyword(s):

Sulfuric Acid ◽

Elemental Analysis ◽

Maldi Tof ◽

Concentrated Sulfuric Acid

Reaction of 4,5,6-trichloropyrimidine-2-carbonitrile (1) with concentrated sulfuric acid at ca. 20 °C gave 4,5,6-trichloropyrimidine-2-carboxamide (5) in 91% yield. The new compound was fully characterized by IR, MALDI-TOF, NMR and elemental analysis.

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