Thiolesters of Perfluorocarboxylic Acids

Hauptschein, Murray; Stokes, Charles S.; Nodiff, Edward A.

doi:10.1021/ja01136a010

Cited by 71 publications

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“…Phenylisothiocyanate was synthesized from aniline, carbon disulphide and ammonia (Dains, Brewster & Olander, 1941). Ethyltrifluorothioacetate was synthesized from trifluoroacetic acid anhydride and ethanethiol (Hauptschein, Stokes & Nodiff, 1952). Monoiodoacetic acid was recrystallized from chloroform.…”

mentioning

confidence: 99%

The amino acid sequences of erabutoxins, neurotoxic proteins of sea-snake (Laticauda semifasciata) venom

Sato

Tamiya

1971

Biochemical Journal

132

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1. Erabutoxin b was reduced, S-carboxymethylated and hydrolysed with trypsin. Seven tryptic fragments were isolated by column chromatography and paper electrophoresis. Some of the fragments were further hydrolysed with alpha-chymotrypsin, pepsin, Nagarse, Proctase A or Proctase B. The amino acid sequences of the fragment peptides were determined by subtractive Edman degradation. 2. From the tryptic digest of reduced, S-carboxymethylated and trifluoroacetylated erabutoxin b two fragments were isolated. From the amino acid composition of the fragments and from the terminal sequence studies on the reduced and S-carboxymethylated erabutoxin b, the sequence of the above seven tryptic fragments was elucidated. 3. The tryptic digestion of reduced and S-carboxymethylated erabutoxin a gave fragments, only one of which was different from the corresponding fragment from erabutoxin b. The amino acid sequence analysis of the fragment peptide showed that the only difference between erabutoxins a and b was that the former had asparagine and the latter had histidine at position 26.

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confidence: 99%

The amino acid sequences of erabutoxins, neurotoxic proteins of sea-snake (Laticauda semifasciata) venom

Sato

Tamiya

1971

Biochemical Journal

132

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“…32" (10 mm ), ny 1 These conditions are more drastic than needed for the preparation of the hydrocarbon analogs. a-Ch[oro-@-nitroethyl acetate.…”

Section: Methodsmentioning

confidence: 99%

Nitration Studies. XI. Preparation of α-Nitroketones and Aldehydes. Nitration of Enol Acetates and Ethers¹

Bachman¹,

Hokama²

1960

J. Org. Chem.

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“…Generally, the carbonyl stretching frequencies of the halo aryl esters are higher than those of the non-halo aryl esters. It was expected that fluorine as the α-substituent would cause a marked shift and recent studies [53] of fluorine substituted aryl esters have substantiated this expectation Introduction of an α-halogen atom into any open chain structure, -CH 2 -CO-, results in increase of carbonyl group frequency. As rotation is possible about the C-C-bond, one would expect infinite number of conformations in α-haloketones.…”

Section: Hammett Spectral Correlation Analysismentioning

confidence: 99%

Synthesis, spectral studies and insect antifeedant activities of some 4-substituted 1-naphthacyl bromide and its esters

Thirunarayanan

2017

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About nine 4-substituted 1-naphthacyl bromides and its esters have been synthesized by greener synthetic method using fly-ash catalyzed water mediated reaction. These acyl bromides and esters have been characterized by their physical constants, Mass, IR and NMR spectral data. These carbonyl frequencies(cm-1) of existed rotomers of these compounds have been assigned and correlated with Hammett substituent constants, F, R and Swain-Lupton’s parameters. The insect antifeedant activities of the synthesized acyl bromide and esters have been evaluated using 4th instar larvae Achoea Janatha L.

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Thiolesters of Perfluorocarboxylic Acids

Cited by 71 publications

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The amino acid sequences of erabutoxins, neurotoxic proteins of sea-snake (Laticauda semifasciata) venom

The amino acid sequences of erabutoxins, neurotoxic proteins of sea-snake (Laticauda semifasciata) venom

Nitration Studies. XI. Preparation of α-Nitroketones and Aldehydes. Nitration of Enol Acetates and Ethers¹

Synthesis, spectral studies and insect antifeedant activities of some 4-substituted 1-naphthacyl bromide and its esters

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Thiolesters of Perfluorocarboxylic Acids

Cited by 71 publications

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The amino acid sequences of erabutoxins, neurotoxic proteins of sea-snake (Laticauda semifasciata) venom

The amino acid sequences of erabutoxins, neurotoxic proteins of sea-snake (Laticauda semifasciata) venom

Nitration Studies. XI. Preparation of α-Nitroketones and Aldehydes. Nitration of Enol Acetates and Ethers1

Synthesis, spectral studies and insect antifeedant activities of some 4-substituted 1-naphthacyl bromide and its esters

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Nitration Studies. XI. Preparation of α-Nitroketones and Aldehydes. Nitration of Enol Acetates and Ethers¹