Výsledky vyhledávání - "Paavo H. Hynninen"

Synthesis and characterization of chlorophyllaenol derivatives: Chlorophyllatert-butyldimethylsilyl-enol ether and 131-deoxo-131, 132-didehydro-chlorophylla

Autor: Markku Mesilaakso, Paavo H. Hynninen

Publikováno v: Journal of Porphyrins and Phthalocyanines. 20:590-601

Using the sterically hindered base, 1,8-diazabicyclo[5.4.0]undec-7-ene, for enolization and tert-butyldimethylsilyl-trifluoromethanesulfonate for silylation, chlorophyll (Chl) [Formula: see text] produced after 15 min at 0 [Formula: see text]C in dea

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d19ceb29e5cffe1be4e098082261bf57
https://doi.org/10.1142/s1088424616500486

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Protonation-deprotonation equilibria in tetrapyrroles Part 4: Mono- and diprotonations of deutero-, hemato-, meso-, and protoporphyrin IX dimethyl esters in methanolic hydrochloric acid

Autor: Paavo H. Hynninen

Publikováno v: Journal of Porphyrins and Phthalocyanines. 18:385-395

The N-protonations in the deutero, hemato, meso and protoporphyrin IX dimethyl esters (DME) were investigated by spectrophotometric titrations using HCl as the acid and methanol as the solvent. Two spectroscopically different protonated species were

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bacd9800d2f2d923a97be744a135fd62
https://doi.org/10.1142/s1088424614500126

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Protonation-deprotonation equilibria in tetrapyrroles Part 3: Mono- and diprotonations of the trimethyl esters of chlorin e6 and the 71-acetal of rhodin g7 in methanolic hydrochloric acid

Autor: Paavo H. Hynninen

Publikováno v: Journal of Porphyrins and Phthalocyanines. 16:1167-1176

Spectrophotometric protonation titrations were performed for the trimethyl esters (TME) of chlorin e6 (31,32-didehydrorhodochlorin-15-acetic acid) and the 71-acetal of rhodin g7 (31,32-didehydrorhodochlorin-71-oxo-15-acetic acid) using HCl as the aci

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bf20eb59d306e591213a5cf80081802a
https://doi.org/10.1142/s1088424612501167

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Protonation-deprotonation equilibria in tetrapyrroles Part 2: Mono- and diprotonation of methyl pyropheophorbide a in methanolic hydrochloric acid as verified by the 1H, 13C HSQC and 1H, 15N HMBC NMR experiments

Autor: Markku Mesilaakso, Paavo H. Hynninen

Publikováno v: Journal of Porphyrins and Phthalocyanines. 16:39-46

The two-dimensional 1H, 13C and 1H, 15N heteronuclear single quantum coherence (HSQC) and heteronuclear multiple bond correlation (HMBC) NMR techniques were applied to investigate the formation of N-protonated cationic species of methyl pyropheophorb

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::300bd1c70700653fa17eb9509e48d7b1
https://doi.org/10.1142/s1088424611004348

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Horseradish peroxidase-catalyzed oxidation of chlorophyll a with hydrogen peroxide

Autor: Paavo H. Hynninen, Erkki Kolehmainen, Vesa Kaartinen

Publikováno v: Biochimica et Biophysica Acta (BBA) - Bioenergetics. 1797(5):531-542

Horseradish peroxidase was verified to catalyze, without any phenol, the hydrogen peroxide oxidation of chlorophyll a (Chl a), solubilized with Triton X-100. The 13(2)(S) and 13(2)(R) diastereomers of 13(2)-hydroxyChl a were characterized as major ox

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::30497c9c231e92b26781c8a12cdf7073

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Oxidation of chlorophyll a with selenium dioxide

Autor: K. Juhani Pitkänen, Paavo H. Hynninen

Publikováno v: Journal of Porphyrins and Phthalocyanines. 11:566-576

The SeO 2 oxidation of chlorophyll ( Chl ) a in deaerated pyridine solution under argon, produced, after 4 hours of refluxing, work-up and chromatographic purifications on a sucrose column, 132(S/R)-hydroxy- Chl a (20%), 132(S/R), P 4(S/R)-dihydroxy-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b10f57f2c5b22e7841da59af1d271100
https://doi.org/10.1142/s1088424607000667

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The enolate anions of chlorophylls a and b as ambident nucleophiles in oxidations with (−)- or (+)-(10-camphorsulfonyl)oxaziridine. Synthesis of 132(S/R)-hydroxychlorophylls a and b

Autor: Paavo H. Hynninen, Markku Mesilaakso, Tuomo S. Leppäkases

Publikováno v: Tetrahedron. 62:3412-3422

The enolate anions of chlorophylls (Chl) are ambident nucleophiles that are of considerable organic chemical interest in relation to the theory of electron delocalization (aromaticity) and charge-transfer in large conjugated π-systems, as well as fo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::07a897eb770e6c59c670e2f497809cb4
https://doi.org/10.1016/j.tet.2006.01.043

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Demethoxycarbonylation and oxidation of 132(S/R)-hydroxy-chlorophyll a to 132-demethoxycarbonyl-132-oxo-chlorophyll a and Mg-purpurin-18 phytyl ester

Autor: Paavo H. Hynninen, Markku Mesilaakso, Tuomo S. Leppäkases

Publikováno v: Tetrahedron Letters. 47:1663-1668

The conversion of 13 2 ( S / R )-hydroxy-chlorophyll (Chl) a to 13 2 -demethoxycarbonyl-13 2 -oxo-Chl a in a yield of 40%, utilizing a simple pyrolysis technique, is described. About 10% of the phytyl ester of Mg-purpurin-18 was formed as a side prod

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f68913f82ad1ec7ed5a4dae51414eafd
https://doi.org/10.1016/j.tetlet.2005.12.106

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Complete assignment of the 1H and 13C NMR spectra and conformational analysis of bonellin dimethyl ester

Autor: Claudia M. Müller, Franz-Peter Montforts, Paavo H. Hynninen, Juho Helaja

Publikováno v: Journal of Porphyrins and Phthalocyanines. :1376-1382

The use of a high-field NMR instrument (ν(1 H ) = 500 MHz ) and 2-dimensional NMR techniques (HMQC, HMBC, ROESY) enabled us to fully assign the 1 H and 13 C chemical shifts of bonellin dimethyl ester. The β-pyrrolic proton of C -3 appeared as a bro

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::495d664a1ce95bbeb302d408200bac69
https://doi.org/10.1142/s1088424604000738

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