Koch A - Search Results

1

Stereoelectronic effects in ring-chain tautomerism of 1,3-diarylnaphth[1,2-e][1,3]oxazines and 3-alkyl-1-arylnaphth[1,2-e][1,3]oxazines.

Szatmári I, Martinek TA, Lázár L, Koch A, Kleinpeter E, Neuvonen K, Fülöp F. Szatmári I, et al. Among authors: koch a. J Org Chem. 2004 May 28;69(11):3645-53. doi: 10.1021/jo0355810. J Org Chem. 2004. PMID: 15152992

2

Substituent influences on the stability of the ring and chain tautomers in 1,3-O,N-heterocyclic systems: characterization by 13C NMR chemical shifts, PM3 charge densities, and isodesmic reactions.

Neuvonen K, Fülöp F, Neuvonen H, Koch A, Kleinpeter E, Pihlaja K. Neuvonen K, et al. Among authors: koch a. J Org Chem. 2001 Jun 15;66(12):4132-40. doi: 10.1021/jo001114w. J Org Chem. 2001. PMID: 11397144

3

Electron-withdrawing substituents decrease the electrophilicity of the carbonyl carbon. An investigation with the aid of (13)C NMR chemical shifts, nu(C[double bond]O) frequency values, charge densities, and isodesmic reactions to interpret substituent effects on reactivity.

Neuvonen H, Neuvonen K, Koch A, Kleinpeter E, Pasanen P. Neuvonen H, et al. Among authors: koch a. J Org Chem. 2002 Oct 4;67(20):6995-7003. doi: 10.1021/jo020121c. J Org Chem. 2002. PMID: 12353992

4

Comparison of the electronic structures of imine and hydrazone side-chain functionalities with the aid of 13C and 15N NMR chemical shifts and PM3 calculations. The influence of C=N-substitution on the sensitivity to aromatic substitution.

Neuvonen K, Fülöp F, Neuvonen H, Koch A, Kleinpeter E, Pihlaja K. Neuvonen K, et al. Among authors: koch a. J Org Chem. 2003 Mar 21;68(6):2151-60. doi: 10.1021/jo020608l. J Org Chem. 2003. PMID: 12636374

5

Electronic influences on 3J(C,H) coupling constants via -S-, -S(O)- and -SO2-: their determination, calculation and comparison of detection methods.

Heydenreich M, Koch A, Kovács J, Tóth G, Kleinpeter E. Heydenreich M, et al. Among authors: koch a. Magn Reson Chem. 2004 Aug;42(8):667-70. doi: 10.1002/mrc.1398. Magn Reson Chem. 2004. PMID: 15248254

6

Configuration and E/Z interconversion mechanism of O(S)-allyl-S(O)-methyl-N-(acridin-9-yl) iminothiocarbonate.

Klika KD, Imrich J, Danihel I, Böhm S, Kristian P, Hamul'aková S, Pihlaja K, Koch A, Kleinpeter E. Klika KD, et al. Among authors: koch a. Magn Reson Chem. 2005 May;43(5):380-8. doi: 10.1002/mrc.1564. Magn Reson Chem. 2005. PMID: 15736139

7

Synthesis, characterisation and theoretical calculations of 2,6-diaminopurine etheno derivatives.

Virta P, Koch A, Roslund MU, Mattjus P, Kleinpeter E, Kronberg L, Sjöholm R, Klika KD. Virta P, et al. Among authors: koch a. Org Biomol Chem. 2005 Aug 21;3(16):2924-9. doi: 10.1039/b505508c. Epub 2005 Jul 6. Org Biomol Chem. 2005. PMID: 16186923

8

Propagation of polar substituent effects in 1-(substituted phenyl)-6,7-dimethoxy-3,4-dihydro- and -1,2,3,4-tetrahydroisoquinolines as explained by resonance polarization concept.

Neuvonen K, Fülöp F, Neuvonen H, Koch A, Kleinpeter E, Pihlaja K. Neuvonen K, et al. Among authors: koch a. J Org Chem. 2005 Dec 23;70(26):10670-8. doi: 10.1021/jo0507946. J Org Chem. 2005. PMID: 16355984

9

Hyperconjugation and the increasing bulk of OCOCX3 substituents in trans-1,4-disubstituted cyclohexanes destabilize the diequatorial conformer.

Kleinpeter E, Rolla N, Koch A, Taddei F. Kleinpeter E, et al. Among authors: koch a. J Org Chem. 2006 Jun 9;71(12):4393-9. doi: 10.1021/jo0600858. J Org Chem. 2006. PMID: 16749766

10

Ab initio study of the substituent effects on the relative stability of the E and Z conformers of phenyl esters. Stereoelectronic effects on the reactivity of the carbonyl group.

Neuvonen H, Neuvonen K, Koch A, Kleinpeter E. Neuvonen H, et al. Among authors: koch a. J Phys Chem A. 2005 Jul 21;109(28):6279-89. doi: 10.1021/jp044172k. J Phys Chem A. 2005. PMID: 16833969

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