Results 21 to 30 of about 13,234 (272)

2-Diphenylphosphinomethyl-3-methylpyrazine

Molbank, 2021
The lateral metalation-electrophilic trapping reaction of alkyl-substituted pyrazines has always been challenging and poorly regioselective, with the corresponding derivatives often being isolated in moderate yield.
Tiziana Boccuzzi, Luciana Cicco, Andrea Francesca Quivelli, Paola Vitale, Filippo Maria Perna, Konstantin Karaghiosoff, Vito Capriati   +6 more
doaj   +1 more source

Synthesis of Symmetrical and Unsymmetrical Pyrazines [PDF]

The Journal of Organic Chemistry, 2007
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Douglass F, Taber, Peter W, DeMatteo, Karen V, Taluskie   +2 more
openaire   +3 more sources

Effect of defatted soybean flour on the flavour of extruded mixtures with wheat flour

Czech Journal of Food Sciences, 2002
Mixtures of wheat semolina, 5% glucose and 0-30% defatted soybean flour were used for the preparation of extruded samples using a pilot plant single screw extruder, maximum temperature being 140°C.
J. Pokorný, A. Farouk Mansour, F. Pudil, V. Janda   +3 more
doaj   +1 more source

High-intensity ultrasound promoted the aldol-type condensation as an alternative mean of synthesizing pyrazines in a Maillard reaction model system of D-glucose-13C6 and L-glycine

Ultrasonics Sonochemistry, 2022
This study evaluated how the generation of pyrazines was promoted by high-intensity ultrasound (HIU) in a Maillard reaction (MR) model system of glucose-glycine.
Ruyue Zhang, Yilong Zhang, Yating Sun, Hang Yu, Fangwei Yang, Yahui Guo, Yunfei Xie, Weirong Yao   +7 more
doaj   +1 more source

Evaluation of Changes in Alkyl Pyrazines, Color and Sensory Properties of Cocoa Powder under Different Roasting Conditions [PDF]

Pizhūhish va Nuāvarī dar ̒Ulūm va Sanāyi̒-i Ghaz̠āyī, 2021
Cocoa is an important product in the world and the raw material for the production of cocoa powder, which is widely used in the chocolate and food industries. Its value and quality are related to its unique and complex flavor combinations.
Samaneh Ebrahimzadegan, Narmela Asefi, Ramin Maleki, Seiied Sadegh Seiiedlou Heris   +3 more
doaj   +1 more source

Tuning the electronic, photophysical and charge transfer properties of small D-A molecules based on Thienopyrazine-terthienyls by changing the donor fragment: A DFT study [PDF]

, 2017
Indexación: Scopus.Four acceptor-donor organic conjugated molecules based on thieno[3,4-b]pyrazine-terthienyls were analyzed in order to explore the effect of the donor substituent on their molecular structures, electronic and optical properties. Density
Aicha, Y.A., Bouachrine, M., Bouzzine, S.M., Hamidi, M., Mendoza-Huizar, L.H., Salgado-Morán, G., Tagle, R.R., Zair, T.   +7 more
core   +1 more source

The Role of Amino Acids in the Formation of Aroma-Active Compounds during Shrimp Hot Air Drying by GC-MS and GC-IMS

Foods, 2022
In the present paper, the role of amino acids of Penaeus vannamei was investigated in the formation of volatile substances during drying. The variations in volatile substances among samples with different moisture contents (raw, 45%, 30%, 15%, and 5 ...
Zewei Zhang, Hongwu Ji, Di Zhang, Shucheng Liu, Xiaoshan Zheng   +4 more
doaj   +1 more source

Changes during the extrusion of semolina in mixture with sugars

Czech Journal of Food Sciences, 2001
Wheat semolina and its mixtures with 5% glucose, fructose of sucrose were processed in a sigle screw extruder at the maximum temperature of 140°C and the processing time of 30 s.
A. Farouk Mansour, F. Pudil, V. Janda, J. Pokorný   +3 more
doaj   +1 more source

Predicting Solid-State Heats of Formation of Newly Synthesized Polynitrogen Materials by Using Quantum Mechanical Calculations [PDF]

, 2008
We present density functional theory level predictions and analysis of the basic properties of newly synthesized high-nitrogen compounds together with 3,6-bis(2H-tetrazol-5-yl)-1,2,4,5-tetrazine (BTT) and 3,3′-azobis(6-amino-1,2,4,5-tetrazine) (DAAT ...
Abou-Rachid, H., Dudiy, S., Goddard, W. A., III, Hu, A., Song, Y., Zybin, S. V.   +5 more
core   +1 more source

Multiple Pathways in Cp₂TiCl₂—Catalyzed Reaction of Tetraalkyl-Substituted Pyrazines with EtAlCl₂ and Mg

Chemistry Proceedings, 2022
There exist a number of classical methods for the synthesis of substituted pyrazines. Among this variety of reactions, the synthesis of substituted pyrazines from nitriles does not stand out in either the number of known examples or in product yield ...
Mariya G. Shaibakova, Nikita A. Rikhter, Leisan K. Dilmukhametova, Ilfir R. Ramazanov   +3 more
doaj   +1 more source