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Action mechanism of35S-containing antiwear and EP additives

Autor: J. M. Herdan, N. Negoita

Publikováno v: Lubrication Science. 6:337-350

Antiwear and extreme-pressure additives labelled with 35S were synthesised by reacting 35S2Cl2 with isobutylene and treating the adduct with potassium xanthate, or by labelling the unlabelled compound with elemental 35S in boiling carbon di-sulphide.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2744c6e60fc940e65921c144add6d15d
https://doi.org/10.1002/ls.3010060404

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Grafting antioxidants; Part VI—grafting kinetics of 35S-Bridged aromatic diamines to rubbers

Autor: N. Negoita, Marilena Morjan, J.M. Herdan, Maria Giurginca

Publikováno v: Polymer Degradation and Stability. 43:203-208

The grafting kinetics of bis-( N -isopropyl- N -phenyl- p -phenylenediamine) disulfide to polyisoprene and styrene-butadiene rubber was investigated using the 35 S labeled disulfide. The labeled compound was synthesized by reacting 35 S 2 Cl 2 with t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::918c6d2ce99490712075dcfbc2fb728c
https://doi.org/10.1016/0141-3910(94)90070-1

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ChemInform Abstract: Synthesis of Substituted Benzoins and the Corresponding Bis-1,2- enedithiol Complexes of Nickel, Platinum, and Palladium

Autor: Mircea D. Gheorghiu, Alexandru T. Balaban, M. Morjan, D. C. Oniciu, N. Negoita

Publikováno v: ChemInform. 22

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a534a52953773be9c8a63337a2cbd754
https://doi.org/10.1002/chin.199144262

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ChemInform Abstract: Factors Affecting Stability and Equilibria of Free Radicals. Part 21. Captodative Diarylaminyl Radicals with a 2,4,6-Trimethylphenyl Group

Autor: U. Bologa, Alexandru T. Balaban, Daniela Carmen Oniciu, Ion Ghiviriga, N. Negoita, M. N. Grecu

Publikováno v: ChemInform. 26

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::74e0982e96a34c6e051feca3eabf4a16
https://doi.org/10.1002/chin.199506096

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ChemInform Abstract: Factors Affecting Stability and Equilibria of Free Radicals. Part 20. Capto-Dative Diarylaminyls with 3,5-Di-t-butylphenyl Donor Group; Oxidation of N-Aryl-2,4,6-tricarbomethoxyanilines

Autor: N. Negoita, Daniela Carmen Oniciu, U. Bologa, M. Ciureanu, Ion Ghiviriga, Alexandru T. Balaban

Publikováno v: ChemInform. 26

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::99e54e4f02ebba1a93e6d9dbdc3ed639
https://doi.org/10.1002/chin.199505041

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Picosecond laser amplifier for optical-parametric-oscillator pumping

Autor: Ionel Valeriu Grozescu, N. Negoita, Constantin G. Fenic, G. L. Muscalu, Razvan Dabu, Aurel Stratan

Publikováno v: SPIE Proceedings.

We describe a source of visible (532 nm) radiation for pumping picosecond optical parametric oscillators. Picosecond pulses generated by a passively Q-switched Nd:YAG oscillator are amplified in two amplifier stages and frequency doubled in a KDP cry

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ef4a43402614153808a75816ffae8a7f
https://doi.org/10.1117/12.203585

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Factors affecting the stability and equilibria of free radicals. Part 14. Unexpected spin densities in 1-(trifluoroacetyl)-2,2-diarylhydrazyl revealed by nitrogen-15 labeling

Autor: Miron Teodor Caproiu, Nicoleta Grecu, Ursula Lucia Bologa, N. Negoita, Robert I. Walter, Alexandru T. Balaban

Publikováno v: The Journal of Organic Chemistry. 52:4176-4179

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c20705f981b3cfae24fb726925edc87e
https://doi.org/10.1021/jo00228a006

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Factors affecting the stability and equilibria of free radicals. Part 11. 1-Benzoyl-2,2-bis-(3,5-di-t-butylphenyl)hydrazyl and its temperature-dependent electron spin resonance spectrum

Autor: M. Teodor Căproiu, Nicoleta Grecu, Mihai Elian, N. Negoita, Alexandru T. Balaban

Publikováno v: J. Chem. Soc., Perkin Trans. 2. :591-594

The title free radical was prepared by oxidizing the corresponding hydrazine with lead tetra-acetate in benzene or toluene. Its e.s.r. spectrum undergoes reversible changes in the temperature range –90 to +60 °C. Simulated e.s.r. spectra indicate

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b16565d0e6a2e4965c823a3d3c372c10
https://doi.org/10.1039/p29830000591

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A study of the reversibility of friedel-crafts C-acetylations by means of 14C-labelling

Autor: N. Negoita, Alexandru T. Balaban, M. Frangopol, A. Genunche, P.T. Frangopol

Publikováno v: Tetrahedron. 23:841-844

The exchange of acetyl groups between acetyl chloride and carbonyl-labelled mesityl oxide or 4-chloro-4-methyl-2-pentanone in the presence of aluminium chloride has shown the revesibility of aliphatic C-acetylations. No such exchange was found with c

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b09177cb60a64c4a03aeb34836bdd567
https://doi.org/10.1016/0040-4020(67)85032-4

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