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1

Hydroxymethylation and polycondensation reactions in urea–formaldehyde resin synthesis

Peep Christjanson, Tõnis Pehk, Kadri Siimer

Journal:

Journal of Applied Polymer Science

Year:

2006

Language:

english

File:

PDF, 110 KB

english, 2006

2

TG-DTA study of melamine-urea-formaldehyde resins

K. Siimer, P. Christjanson, T. Kaljuvee, T. Pehk, I. Lasn, I. Saks

Journal:

Journal of Thermal Analysis and Calorimetry

Year:

2008

Language:

english

File:

PDF, 330 KB

english, 2008

3

Thermal behaviour of melamine-modified urea–formaldehyde resins

Kadri Siimer, Tiit Kaljuvee, Tõnis Pehk, Ilmar Lasn

Journal:

Journal of Thermal Analysis and Calorimetry

Year:

2010

Language:

english

File:

PDF, 549 KB

english, 2010

4

ChemInform Abstract: Direct Asymmetric α-Hydroxylation of β-Hydroxyketones.

M. LOPP, A. PAJU, T. KANGER, T. PEHK

Journal:

Year:

1997

File:

PDF, 28 KB

1997

5

Über die 1H-, 13C- und 29Si-NMR chemischen Verschiebungen einiger linearer, verzweigter und cyclischer Methylsiloxan-Verbindungen

G. Engelhardt, H. Jancke, M. Mägi, T. Pehk, E. Lippmaa

Journal:

Journal of Organometallic Chemistry

Year:

1971

File:

PDF, 601 KB

1971

6

Structure and curing mechanism of resol phenol-formaldehyde prepolymer resins

Christjanson, P, Pehk, T, Paju, J

Journal:

Proceedings of the Estonian Academy of Sciences

Year:

2010

Language:

english

File:

PDF, 165 KB

english, 2010

7

Structure of polycondensates from hydroxymethylphenols

Peep Christjanson, Tõnis Pehk, Kadri Siimer, Jane Paju

Journal:

Journal of Applied Polymer Science

Year:

2008

Language:

english

File:

PDF, 204 KB

english, 2008

8

ChemInform Abstract: Asymmetric Baeyer-Villiger Oxidation of Cyclobutanones.

M. LOPP, A. PAJU, T. KANGER, T. PEHK

Journal:

Year:

1997

File:

PDF, 29 KB

1997

9

ChemInform Abstract: Lipase-Catalyzed Enantioselective Hydrolysis of Bicyclo[3.2.0]heptanol Esters in Supercritical Carbon Dioxide.

O. PARVE, I. VALLIKIVI, L. LAHE, A. METSALA, UE. LILLE, V. TOUGU, H. VIJA, T. PEHK

Journal:

Year:

1997

File:

PDF, 36 KB

1997

10

ChemInform Abstract: Synthesis of Chiral Epoxyalkynes.

T. KANGER, P. NIIDAS, A.-M. MUEUERISEPP, T. PEHK, M. LOPP

Journal:

Year:

1998

File:

PDF, 40 KB

1998

11

ChemInform Abstract: Asymmetric Oxidation of Cyclobutanones: Modification of the Sharpless Catalyst.

Tonis Kanger, Kadri Kriis, Anne Paju, Tonis Pehk, Margus Lopp

Journal:

Year:

1999

File:

PDF, 31 KB

1999

12

ChemInform Abstract: Lipase-Catalyzed Acylation of Prostanoids.

Omar Parve, Ivar Jaerving, Ivar Martin, Metsala Andrus Metsala Andrus, Imre Vallikivi, Madis Aidnik, Tonis Pehk, Nigulas Samel

Journal:

Year:

1999

File:

PDF, 33 KB

1999

13

ChemInform Abstract: Synthesis of the AB-Ring of 9,11-Secosterols.

Riina Aav, Tonis Kanger, Tonis Pehk, Margus Lopp

Journal:

Year:

2000

File:

PDF, 30 KB

2000

14

ChemInform Abstract: Asymmetric Oxidation of 1,2-Cyclopentanediones.

Anne Paju, Tonis Kanger, Tonis Pehk, Margus Lopp

Journal:

Year:

2000

File:

PDF, 30 KB

2000

15

ChemInform Abstract: Asymmetric Oxidation of Ketones

Margus Lopp, Anne Paju, Tonis Kanger, Kadri Kriis, Kaja Ilmarinen, Tonis Pehk

Journal:

Year:

2002

File:

PDF, 23 KB

2002

16

A Comparative Study of the Synthesis of C2-Symmetric Chiral 2,2′-Biaziridinyls.

Tonis Kanger, Kerti Ausmees, Aleksander-Mati Mueuerisepp, Tonis Pehk, Margus Lopp

Journal:

Year:

2003

File:

PDF, 92 KB

2003

17

ChemInform Abstract: Synthesis of 5,5′-Disubstituted Bimorpholines

Kristin Lippur, Cindy Elmers, Tiiu Kailas, Aleksander-Mati Mueuerisepp, Tonis Pehk, Tonis Kanger, Margus Lopp

Journal:

Year:

2010

File:

PDF, 27 KB

2010

18

ChemInform Abstract: A Novel Diastereoselective Multicomponent Cascade Reaction.

Kadri Kriis, Kerti Ausmees, Tonis Pehk, Margus Lopp, Tonis Kanger

Journal:

Year:

2010

File:

PDF, 35 KB

2010

19

ChemInform Abstract: Synthesis of Novel Acyclic Nucleoside Analogues with anti-Retroviral Activity.

A. Paju, M. Paeri, A. Selyutina, E. Zusinaite, A. Merits, T. Pehk, K. Siirde, A.-M. Mueuerisepp, T. Kailas, M. Lopp

Journal:

Year:

2011

File:

PDF, 42 KB

2011

20

High-field 2D NMR spectroscopy of amanitin isomers

T. Pehk, M. Haga, H. Vija, E. Lippmaa

Journal:

Magnetic Resonance in Chemistry

Year:

1989

Language:

english

File:

PDF, 924 KB

english, 1989

21

Carbon-13 chemical shifts of α,β-unsaturated acids

E. Lippmaa, T. Pehk, K. Andersson, C. Rappe

Journal:

Magnetic Resonance in Chemistry

Year:

1970

Language:

english

File:

PDF, 727 KB

english, 1970

22

Kernresonanzuntersuchungen am 1.10-Phenanthrolin und seinen Komplexverbindungen—IV: 13C-Resonanzen des freien und protonierten 1.10-Phenanthrolins

H. Rosenberger, M. Pettig, K. Madeja, T. Pehk, E. Lippmaa

Journal:

Magnetic Resonance in Chemistry

Year:

1970

File:

PDF, 405 KB

1970

23

Carbon-13 chemical shifts of bicyclic compounds

E. Lippmaa, T. Pehk, J. Paasivirta, N. Belikova, A. Platé

Journal:

Magnetic Resonance in Chemistry

Year:

1970

Language:

english

File:

PDF, 1.64 MB

english, 1970

24

Carbon-13 chemical shifts of monosubstituted cyclohexanes

T. Pehk, E. Lippmaa

Journal:

Magnetic Resonance in Chemistry

Year:

1971

Language:

english

File:

PDF, 518 KB

english, 1971

25

13C NMR spectra of adamantane derivatives

T. Pehk, E. Lippmaa, V. V. Sevostjanova, M. M. Krayuschkin, A. I. Tarasova

Journal:

Magnetic Resonance in Chemistry

Year:

1971

Language:

english

File:

PDF, 469 KB

english, 1971

26

13C-NMR-chemische Verschiebungen von Polymethinen. Elektronenstruktur und Lösungsmitteleinfluss

R. Radeglia, G. Engelhardt, E. Lippmaa, T. Pehk, K.-D. Nolte, S. Dähne

Journal:

Magnetic Resonance in Chemistry

Year:

1972

File:

PDF, 224 KB

1972

27

Carbon-13 chemical shifts of substituted nortricyclenes

E. Lippmaa, T. Pehk, J. Paasivirta

Journal:

Magnetic Resonance in Chemistry

Year:

1973

Language:

english

File:

PDF, 859 KB

english, 1973

28

Relation between the carbon chemical shifts and the J(CH) spin-spin coupling constants

T. Pehk, M. Alla, E. Lippmaa

Journal:

Magnetic Resonance in Chemistry

Year:

1973

Language:

english

File:

PDF, 148 KB

english, 1973

29

CIDNP of 13C and 1H nuclei in the reactions of cyclohexadienone carbenes

G. A. Nikiforov, Sh. A. Markaryan, L. G. Plekhanova, B. D. Sviridov, S. V. Rykov, V. V. Ershov, A. L. Buchachenko, T. Pehk, T. Saluvere, E. Lippmaa

Journal:

Magnetic Resonance in Chemistry

Year:

1973

Language:

english

File:

PDF, 326 KB

english, 1973

30

Struktur-Reaktivitätsuntersuchungen mit heterosubstituierten Nitrilen—VII:13C-, 14N- und 19F-NMR-Spektroskopische Untersuchungen an Verbindungen vom Typ ArXCN

R. Radeglia, W. Storek, G. Engelhardt, F. Ritschl, E. Lippmaa, T. Pehk, M. Mägi, D. Martin

Journal:

Magnetic Resonance in Chemistry

Year:

1973

File:

PDF, 348 KB

1973

31

Chemical polarisation of 13C and 15N nuclei in the thermal decomposition of diazoaminobenzene (1,3-diphenyltriazene)

E. Lippmaa, T. Saluvere, T. Pehk, A. Olivson

Journal:

Magnetic Resonance in Chemistry

Year:

1973

Language:

english

File:

PDF, 571 KB

english, 1973

32

Chemical polarisation of 15N and 13C nuclei in diazo coupling reactions

E. Lippmaa, T. Pehk, T. Saluvere, M. Mägi

Journal:

Magnetic Resonance in Chemistry

Year:

1973

Language:

english

File:

PDF, 345 KB

english, 1973

33

Carbon-13 chemical shifts and conformations of dimethylcyclohexanols

T. Pehk, H. Kooskora, E. Lippmaa

Journal:

Magnetic Resonance in Chemistry

Year:

1976

Language:

english

File:

PDF, 545 KB

english, 1976

34

Carbon-13 chemical shifts of bicyclo[3.2.1]octane and bicyclo[2.2.1]heptane derivatives

E. Lippmaa, T. Pehk, N. A. Belikova, A. A. Bobyleva, A. N. Kalinichenko, M. D. Ordubadi, A. F. Platé

Journal:

Magnetic Resonance in Chemistry

Year:

1976

Language:

english

File:

PDF, 582 KB

english, 1976

35

Quantitative 15N NMR spectroscopy

George C. Levy, T. Pehk, P. R. Srinivasan

Journal:

Magnetic Resonance in Chemistry

Year:

1980

Language:

english

File:

PDF, 410 KB

english, 1980

36

13C and 15N NMR study of acyclic vicinal diastereoisomers. Conformational effects

George C. Levy, T. Pehk, E. Lippmaa

Journal:

Magnetic Resonance in Chemistry

Year:

1980

Language:

english

File:

PDF, 568 KB

english, 1980

37

Conformational and long-range low field steric deuterium isotope effects on carbon chemical shifts

T. Pehk, A. Laht, E. Lippmaa

Journal:

Magnetic Resonance in Chemistry

Year:

1982

Language:

english

File:

PDF, 252 KB

english, 1982

38

Theoretical prediction and assignment of vicinal 1H–1H coupling constants of diastereomeric 3-alkoxy-6,7-epoxy-2-oxabicyclo[3.3.0]octanes

Riina Aav, Tõnis Pehk, Sven Tamp, Toomas Tamm, Marina Kudrjašova, Omar Parve, Margus Lopp

Journal:

Magnetic Resonance in Chemistry

Year:

2011

Language:

english

File:

PDF, 185 KB

english, 2011

39

Isolation and structure of a new oligosaccharide formed as a by-product during the preparation of commercial lactulose

Tönis Pehk, Endel Lippmaa, Jan Schraml, Otomar Pihar, Milan Minárik, Ján Hirsch, Heinrich Knobloch, Saurendra Nath Datta

Journal:

Carbohydrate Research

Year:

1988

Language:

english

File:

PDF, 494 KB

english, 1988

40

Chemically induced dynamic nuclear polarization of 13C nuclei in the thermal decomposition of organic peroxides

E. Lippmaa, T. Pehk, A.L. Buchachenko, S.V. Rykov

Journal:

Chemical Physics Letters

Year:

1970

Language:

english

File:

PDF, 532 KB

english, 1970

41

The reactions of brexadiene - a new norbornene-like caged diene

A.A. Bobylyova, N.F. Dubitskaya, A.V. Khoroshutin, T.I. Pehk, N.A. Belikova

Journal:

Tetrahedron Letters

Year:

1991

Language:

english

File:

PDF, 200 KB

english, 1991

42

Asymmetric Baeyer-Villiger oxidation of cyclobutanones

Margus Lopp, Anne Paju, Tõnis Kanger, Tõnis Pehk

Journal:

Tetrahedron Letters

Year:

1996

Language:

english

File:

PDF, 236 KB

english, 1996

43

Synthesis and anti-aggregative activity of novel ω-achiral carba-analogues of prostacyclin

M Lopp, G Kobzar, M Bergmann, T Pehk, A Lopp, T Valimäe, M Viigimaa, Ü Lille

Journal:

European Journal of Medicinal Chemistry

Year:

1992

Language:

english

File:

PDF, 486 KB

english, 1992

44

Carbocyclic 3′-deoxyadenosine-based highly potent bisubstrate-analog inhibitor of basophilic protein kinases

Erki Enkvist, Gerda Raidaru, Angela Vaasa, Tõnis Pehk, Darja Lavogina, Asko Uri

Journal:

Bioorganic & Medicinal Chemistry Letters

Year:

2007

Language:

english

File:

PDF, 146 KB

english, 2007

45

Structural and compositional characteristics of gelling galactan from the red alga Ahnfeltia tobuchiensis (Ahnfeltiales, the Sea of Japan)

Kalle Truus, Rando Tuvikene, Merike Vaher, Tiiu Kailas, Peeter Toomik, Tõnis Pehk

Journal:

Carbohydrate Polymers

Year:

2006

Language:

english

File:

PDF, 257 KB

english, 2006

46

Structure and thermal stability of pyruvated carrageenans from the red alga Coccotylus truncatus

Rando Tuvikene, Kalle Truus, Marju Robal, Tõnis Pehk, Tiiu Kailas, Merike Vaher, Tiina Paalme

Journal:

Carbohydrate Research

Year:

2009

Language:

english

File:

PDF, 774 KB

english, 2009

47

Synthesis of 4′-aryl-2′,3′-dideoxynucleoside analogues

Artur Jõgi, Anne Paju, Tõnis Pehk, Tiiu Kailas, Aleksander-Mati Müürisepp, Margus Lopp

Journal:

Year:

2009

Language:

english

File:

PDF, 284 KB

english, 2009

48

Oxidation of cyclopentane-1,2-dione: a study with 18O labeled reagents

Indrek Reile, Anne Paju, Aleksander-Mati Müürisepp, Tõnis Pehk, Margus Lopp

Journal:

Year:

2011

Language:

english

File:

PDF, 790 KB

english, 2011

49

Synthesis of chiral hydroxylated cyclopentanones and cyclopentanes

Allan Niidu, Anne Paju, Margus Eek, Aleksander-Mati Müürisepp, Tõnis Pehk, Margus Lopp

Journal:

Tetrahedron: Asymmetry

Year:

2006

Language:

english

File:

PDF, 172 KB

english, 2006

50

Asymmetric synthesis of 4′-C-benzyl-2′,3′-dideoxynucleoside analogues from 3-benzyl-2-hydroxy-2-cyclopenten-1-one

Artur Jõgi, Marit Ilves, Anne Paju, Tõnis Pehk, Tiiu Kailas, Aleksander-Mati Müürisepp, Margus Lopp

Journal:

Tetrahedron: Asymmetry

Year:

2008

Language:

english

File:

PDF, 181 KB

english, 2008