<sup>1</sup>H‐NMR‐spektroskopische Untersuchungen an substituierten Crotonsäure‐ und Dithiocrotonsäureestern

Michalik, Manfred; Kreutzmann, J.

doi:10.1002/prac.19833250607

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Introduetlon Spectroscopic Data (Ir 1h Nmr 13c1

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1984

1988

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Cited by 9 publications

(1 citation statement)

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“…NMR, 15N NMR, dipole measurement) and the reaction behaviour of the two activated ethenes ethyl 3-amino-2-cyanocrotonate (ACC) and ethyl 3-amino-2-cyanodithiocrotonate (ACD) have been studied (Kreutzmann, 1980;Michalik & Kreutzmann, 1983 …”

Section: Introduetlon Spectroscopic Data (Ir 1h Nmr 13cmentioning

confidence: 99%

Structures of ethyl 3-amino-2-cyanocrotonate, C7H10N2O2, and ethyl 3-amino-2-cyanodithiocrotonate, C7H10N2S2

Szulzewsky¹,

Schulz²,

Kulpe³

et al. 1984

Acta Crystallogr C

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Section: Introduetlon Spectroscopic Data (Ir 1h Nmr 13cmentioning

confidence: 99%

Structures of ethyl 3-amino-2-cyanocrotonate, C7H10N2O2, and ethyl 3-amino-2-cyanodithiocrotonate, C7H10N2S2

Szulzewsky¹,

Schulz²,

Kulpe³

et al. 1984

Acta Crystallogr C

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Synthesis of 4‐thiocarbamoyl‐5‐aminopyrazoles

Giori¹,

Veronese²,

Vicentini³

et al. 1985

Journal of Heterocyclic Chem

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Aryl and t‐butylhydrazines react with 2‐cyano‐3‐ethoxythiocrotonamide affording 2‐cyano‐3‐aryl‐t‐butylhy‐drazinothiocrotonamides. These intermediates can be easily cyclized to 4‐thiocarbamoyl‐5‐aminopyrazoles by heating a few minutes in a strong base. Alkylhydrazines react with 2‐cyano‐3‐ethoxythiocrotonamide yielding directly a mixture of the cyclized compounds 4‐cyano‐5‐aminopyrazoles and 4‐thiocarbamoyl‐5‐aminopyr‐azoles.

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NMR‐Spektroskopische Untersuchungen an 2‐Acetyl‐3‐amino‐acrylsäureestern

Michalik

1985

J. Prakt. Chem.

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N.M.R. Spectroscopical Investigations on 2‐Acetyl‐3‐aminoacrylates The 2‐Acetyl‐3‐aminoacrylates 3 exist as Z/E‐isomers, in which intramolecular H‐bonds are formed between NH and acetyl or ester groups. The E‐isomers are favoured due to the greater acceptor ability of the acetyl compared with ester group. In arylamino substituted compounds 3 a linear correlation with σp constants have been found for 1H chemicals shifts of CH and NH protons and for 13C chemical shifts of C‐2 and C‐3, respectively, representing an optimal transmission of substituent effects through the enamino system. The barriers of rotation around the CC‐bond of 3 have been determined by d n.m.r.spectroscopy. From coalescence phenomena the free activation enthalpies ΔG≠ of rotational process are determined and discussed with respect to substituent effects, a thermal rotational mechanism is postulated.

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¹H‐NMR‐spektroskopische Untersuchungen an substituierten Crotonsäure‐ und Dithiocrotonsäureestern

Cited by 9 publications

References 16 publications

Structures of ethyl 3-amino-2-cyanocrotonate, C7H10N2O2, and ethyl 3-amino-2-cyanodithiocrotonate, C7H10N2S2

Structures of ethyl 3-amino-2-cyanocrotonate, C7H10N2O2, and ethyl 3-amino-2-cyanodithiocrotonate, C7H10N2S2

Synthesis of 4‐thiocarbamoyl‐5‐aminopyrazoles

NMR‐Spektroskopische Untersuchungen an 2‐Acetyl‐3‐amino‐acrylsäureestern

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1H‐NMR‐spektroskopische Untersuchungen an substituierten Crotonsäure‐ und Dithiocrotonsäureestern

Cited by 9 publications

References 16 publications

Structures of ethyl 3-amino-2-cyanocrotonate, C7H10N2O2, and ethyl 3-amino-2-cyanodithiocrotonate, C7H10N2S2

Structures of ethyl 3-amino-2-cyanocrotonate, C7H10N2O2, and ethyl 3-amino-2-cyanodithiocrotonate, C7H10N2S2

Synthesis of 4‐thiocarbamoyl‐5‐aminopyrazoles

NMR‐Spektroskopische Untersuchungen an 2‐Acetyl‐3‐amino‐acrylsäureestern

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About

¹H‐NMR‐spektroskopische Untersuchungen an substituierten Crotonsäure‐ und Dithiocrotonsäureestern