Role of additives in cobalt-mediated oxidative crosslinking of alkyd resins

被引：25

作者：

Tanase, S ^{[1
]}

Bouwman, E ^{[1
]}

Reedijk, J ^{[1
]}

机构：

[1] Leiden Univ, Leiden Inst Chem, Gorlaeus Labs, NL-2300 RA Leiden, Netherlands

来源：

APPLIED CATALYSIS A-GENERAL | 2004年 / 259卷 / 01期

关键词：

cobalt; drier; ethyl linoleate; alkyd paint; pyrazole; anti-skinning; coating;

D O I：

10.1016/j.apcata.2003.09.014

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Spectroscopic and chromatographic studies have been carried out to investigate the interaction between bis(acetylacetonato)cobalt(II) and pyrazole ligands as possible anti-skinning additives, and their role in the oxidative crosslinking reactions has been tested. From experimental results (UV-Vis, TR-FTIR, SEC) it has been concluded that Co(acac)(2) can be used as drier promoter for alkyd paints and its catalytic activity is similar to that of the actual commercial drier (Co Nuodex). The presence of pyrazole ligands as anti-skinning additives precludes association of Co(acac)2 that usually occurs in nonpolar media and it facilitates the formation of stable coordinated ROO. radicals, that inhibit the radical chain reaction. From EPR results it has been established that the stability of the [Co-III(acac)(2)(ROO.)L](+) complex radicals is highly dependent of the molar ratio between the cobalt catalyst and the organic additive L. The dependence of anti-skinning activity on the concentration of the pyrazole additives has been studied and a mechanism of inhibiting properties of azoles on the oxidative crosslinking reactions has been proposed. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：101 / 107

页数：7

共 50 条

[31] A Density Functional Theory Study on the Cobalt-Mediated Intramolecular Pauson-Khand Reaction of Enynes Containing a Vinyl Fluoride Moiety [J].

Escorihuela, Jorge .

SYNTHESIS-STUTTGART, 2023, 55 (07) :1139-1149

[32] Transition metal-catalyzed reactions in organic synthesis, part 10. Cobalt-mediated regioselective synthesis of substituted tetrahydroquinolines [J].

Groth, U ;

Huhn, T ;

Kesenheimer, C ;

Kalogerakis, A .

SYNLETT, 2005, (11) :1758-1760

[33] Cobalt-Mediated Selective Synthesis of Iodine Functionalized Imidazo-Fused Heterocycles Using 2-Aminopyridine, Styrene or Acetophenone [J].

Borah, Priyanka ;

Kyndiah, Lenida ;

Bora, Rona moni ;

Chingangbam, Sangeeta ;

Pal, Amarta Kumar .

CHEMISTRYSELECT, 2025, 10 (05)

[34] Cobalt-Mediated [2+2+2] Cycloadditions of Alkynes to Benzo[b]furans and Benzo[b]thiophenes: A Potential Route toward Morphanoids [J].

Aechtner, Tobias ;

Barry, David A. ;

David, Ellen ;

Ghellamallah, Cedric ;

Harvey, Daniel F. ;

de la Houpliere, Alix ;

Knopp, Monika ;

Malaska, Michael J. ;

Perez, Dolores ;

Scharer, Kaspar A. ;

Siesel, Brian A. ;

Vollhardt, K. Peter C. ;

Zitterbart, Robert .

SYNTHESIS-STUTTGART, 2018, 50 (05) :1053-1089

[35] The Trajectory of the (η5-Cyclopentadienyl)cobalt-Mediated Cycloisomerization of Ene-Yne-Ene-Type Allyl Propargylic Ethers to Furans: A DFT Appraisal [J].

Wong, Jonathan J. ;

Chen, Xiangyang ;

Houk, Kendall N. ;

Vollhardt, K. Peter C. .

SYNTHESIS-STUTTGART, 2021, 53 (22) :4279-4289

[36] Synthesis of (3S)-hydroxyandrosta-5,7-diene-17-ones via intramolecular cobalt-mediated [2+2+2] cycloaddition [J].

Groth, U ;

Richter, N ;

Kalogerakis, A .

SYNLETT, 2006, (06) :905-908

[37] Regio- and stereoselective approach to 1,2-di- and 1,1,2-trisilylethenes by cobalt-mediated reaction of silyl-substituted dibromomethanes with silylmethylmagnesium reagents [J].

Ohmiya, H ;

Yorimitsu, H ;

Oshima, K .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2005, 44 (22) :3488-3490

[38] Cobalt-Mediated Linear 2:1 Co-oligomerization of Alkynes with Enol Ethers to Give 1-Alkoxy-1,3,5-Trienes: A Missing Mode of Reactivity [J].

Lebaeuf, David ;

Iannazzo, Laura ;

Geny, Anais ;

Malacria, Max ;

Vollhardt, K. Peter C. ;

Aubert, Corinne ;

Gandon, Vincent .

CHEMISTRY-A EUROPEAN JOURNAL, 2010, 16 (29) :8904-8913

[39] Highly Diastereoselective Cobalt-Mediated C(sp3)-C(sp2) Cross-Coupling Reactions of Cyclic Halohydrins with (Hetero) Aryl Grignard Reagents [J].

Hammann, Jeffrey M. ;

Haas, Diana ;

Steib, Andreas K. ;

Knochel, Paul .

SYNTHESIS-STUTTGART, 2015, 47 (10) :1461-1468

[40] Cobalt-mediated [2+2+2] cycloaddition versus C-H and N-H activation of 2-pyridones and pyrazinones with alkynes: A theoretical study [J].

Aubert, Corinne ;

Gandon, Vincent ;

Geny, Anais ;

Heckrodt, Thilo J. ;

Malacria, Max ;

Paredes, Elisa ;

Vollhardt, K. Peter C. .

CHEMISTRY-A EUROPEAN JOURNAL, 2007, 13 (26) :7466-7478

← 1 2 3 4 5 →