All articles by Per Halfdan Nielsen

36 articles

Articles in volume 17 (1963)

Stereochemistry of 5-Co-ordinated Compounds. III. Some New Phosphine Complexes of Divalent Nickel and Cobalt.

Jensen, Kai Arne; Nielsen, Per Halfdan; Pedersen, Carl Th.

Pages: 1115-1125.

DOI number: 10.3891/acta.chem.scand.17-1115
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Infrared Spectra of Some Organic Compounds of Group V B Elements.

Jensen, Kai Arne; Nielsen, Per Halfdan

Pages: 1875-1885.

DOI number: 10.3891/acta.chem.scand.17-1875
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Articles in volume 18 (1964)

Studies of Chelates with Heterocyclic Ligands. I. Chelates Derived from N,N'-Bis-(8-quinolyl)-ethylenediamine and Analogous Compounds.

Jensen, Kai Arne; Nielsen, Per Halfdan

Pages: 1-10.

DOI number: 10.3891/acta.chem.scand.18-0001
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Articles in volume 20 (1966)

Infrared Spectra of Thioamides and Selenoamides.

Jensen, Kai Arne; Nielsen, Per Halfdan

Pages: 597-629.

DOI number: 10.3891/acta.chem.scand.20-0597
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Studies of Chelates with Heterocyclic Ligands. II. Ionic Nickel(II) and Copper(II) Chelates with 8-Aminoquinoline and some of its Derivatives.

Nielsen, Per Halfdan; Dahl, Otto

Pages: 1113-1121.

DOI number: 10.3891/acta.chem.scand.20-1113
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Articles in volume 21 (1967)

Studies of Chelates with Heterocyclic Ligands. III. Coordination Compounds of Transition Metals with 5-Aminoquinoxaline.

Dahl, Otto; Nielsen, Per Halfdan

Pages: 1153-1161.

DOI number: 10.3891/acta.chem.scand.21-1153
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N-Isothiocyanatoamines. II. Synthesis and Rearrangement of N-Isothiocyanatodiphenylamine.

Anthoni, Uffe; Larsen, Charles; Nielsen, Per Halfdan

Pages: 1201-1205.

DOI number: 10.3891/acta.chem.scand.21-1201
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N-Isothiocyanatoamines. III. N-Isothiocyanatodiisopropylamine. Preparation, Physical Properties, and Reactions with Amines and Hydrazines.

Anthoni, Uffe; Larsen, Charles; Nielsen, Per Halfdan

Pages: 2061-2068.

DOI number: 10.3891/acta.chem.scand.21-2061
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Articles in volume 22 (1968)

N-Isothiocyanatoamines. IV. Dimerization of N-Isothiocyanatodimethylamine.

Anthoni, Uffe; Larsen, Charles; Nielsen, Per Halfdan

Pages: 309-318.

DOI number: 10.3891/acta.chem.scand.22-0309
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Derivatives of Hydrazine. I. Preparation and Infrared Spectra of Partially Deuterated Mono- and Dimethylhydrazines.

Anthoni, Uffe; Larsen, Charles; Nielsen, Per Halfdan

Pages: 1025-1035.

DOI number: 10.3891/acta.chem.scand.22-1025
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N-Isothiocyanatoamines. VII. Structural Influence on the Reaction between N-Isothiocyanatodiisopropylamine and Amines and Hydrazides.

Anthoni, Uffe; Larsen, Charles; Nielsen, Per Halfdan

Pages: 1898-1906.

DOI number: 10.3891/acta.chem.scand.22-1898
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N-Isothiocyanatoamines. VIII. The Mass Spectra of an N-Isothiocyanatodimethylamine Dimer Containing the 1,2,4-Triazole Ring and of Seven Deuterium Labeled Analogs.

Møller, Jørgen; Anthoni, Uffe; Larsen, Charles; Nielsen, Per Halfdan

Pages: 2493-2509.

DOI number: 10.3891/acta.chem.scand.22-2493
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Articles in volume 23 (1969)

N-Isothiocyanatoamines. IX. Infrared Study by Deuterium Labelling of an N-Isothiocyanatodimethylamine Dimer and Analogous Compounds Containing the 1,2,4-Triazole Ring. Identification of the C=S Stretching Frequency of Tertiary Cyclic Thioureides.

Anthoni, Uffe; Larsen, Charles; Nielsen, Per Halfdan

Pages: 537-547.

DOI number: 10.3891/acta.chem.scand.23-0537
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N-Isothiocyanatoamines. X. The Reaction between N-Isothiocyanatodiisopropylamine and Phosphines.

Anthoni, Uffe; Dahl, Otto; Larsen, Charles; Nielsen, Per Halfdan

Pages: 943-951.

DOI number: 10.3891/acta.chem.scand.23-0943
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Derivatives of Hydrazine. II. 1-(N,N-Dialkylthiocarbazoyl)imidazoles and Related Compounds. Magnetic Nonequivalence in the 1H NMR Signals of the Diisopropylamino Group.

Anthoni, Uffe; Larsen, Charles; Nielsen, Per Halfdan

Pages: 1231-1246.

DOI number: 10.3891/acta.chem.scand.23-1231
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Derivatives of Hydrazine. IV. Second Order Approach to A6B 1H NMR Spectra.

Anthoni, Uffe; Larsen, Charles; Nielsen, Per Halfdan; Schaumburg, Kjeld; Borch, Gunner

Pages: 3376-3384.

DOI number: 10.3891/acta.chem.scand.23-3376
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N-Isothiocyanatoamines. XII. Preparation and Isomerism of N,N-Diisopropyldithiocarbazic Esters.

Anthoni, Uffe; Larsen, Charles; Nielsen, Per Halfdan

Pages: 3385-3392.

DOI number: 10.3891/acta.chem.scand.23-3385
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Derivatives of Hydrazine. V. cis-trans Isomerism, Dipolar Structure, and Magnetic Nonequivalence of the Isopropyl Methyl 1H NMR Signals of Acyl and Thioacyl N,N-Diisopropylhydrazines.

Anthoni, Uffe; Larsen, Charles; Nielsen, Per Halfdan

Pages: 3513-3524.

DOI number: 10.3891/acta.chem.scand.23-3513
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Articles in volume 24 (1970)

Derivatives of Hydrazine. VII. Structure and Reactions of 5,5-Dialkyl-1,3,4-thiadiazolidine-2-thiones.

Anthoni, Uffe; Larsen, Charles; Nielsen, Per Halfdan

Pages: 179-188.

DOI number: 10.3891/acta.chem.scand.24-0179
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Derivatives of Hydrazine. VIII. A Study of Dithiocarbazic Acids, Thiocarbazoylsulfides, and Selenium Analogues.

Anthoni, Uffe; Dahl, Britta Mynster; Larsen, Charles; Nielsen, Per Halfdan

Pages: 959-984.

DOI number: 10.3891/acta.chem.scand.24-0959
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Articles in volume 25 (1971)

Tentative Assignment of Fundamental Vibrations of Thio- and Selenocarboxylates. II. Dimethyldithiocarbamate Ion.

Jensen, Kai Arne; Dahl, Britta Mynster; Nielsen, Per Halfdan; Borch, Gunner

Pages: 2029-2038.

DOI number: 10.3891/acta.chem.scand.25-2029
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Tentative Assignment of Fundamental Vibrations of Thio- and Selenocarboxylates. III. Dimethyldiselenocarbamate Ion and the Concept of Selenation.

Jensen, Kai Arne; Dahl, Britta Mynster; Nielsen, Per Halfdan; Borch, Gunner

Pages: 2039-2047.

DOI number: 10.3891/acta.chem.scand.25-2039
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Articles in volume 26 (1972)

Tentative Assignment of Fundamental Vibrations of Thio- and Selenocarboxylates. IV. Bis(N,N-dimethyldithiocarbamato)nickel(II) and Bis(N,N-dimethyldiselenocarbamato)-nickel(II).

Jensen, Kai Arne; Dahl, Britta Mynster; Nielsen, Per Halfdan; Borch, Gunner

Pages: 2241-2254.

DOI number: 10.3891/acta.chem.scand.26-2241
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Articles in volume 28b (1974)

Derivatives of Hydrazine. X. The Reaction between Thiophosgene and Semicarbazide or Thiosemicarbazide.

Anthoni, Uffe; Nielsen, Per Halfdan

Pages: 489-491.

DOI number: 10.3891/acta.chem.scand.28b-0489
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Derivatives of Hydrazine. XI. Rotational Isomerism of Methyl Diselenocarbamates and Diselenocarbazates.

Dahl, Britta Mynster; Nielsen, Per Halfdan

Pages: 501-504.

DOI number: 10.3891/acta.chem.scand.28b-0501
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Derivatives of Hydrazine. XII. Rotational Isomerism of Methyl Dithiocarbamates and Dithiocarbazates.

Dahl, Britta Mynster; Nielsen, Per Halfdan

Pages: 1091-1095.

DOI number: 10.3891/acta.chem.scand.28b-1091
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Articles in volume 30b (1976)

The Reaction between Thiophosgene and Hydrazines. Formation of Trithiocarbonates with N,S-Ambident 1,3,4-Thiadiazolines as Intermediates.

Anthoni, Uffe; Dahl, Britta Mynster; Eggert, Hanne; Larsen, Charles; Nielsen, Per Halfdan

Pages: 71-82.

DOI number: 10.3891/acta.chem.scand.30b-0071
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Articles in volume 48 (1994)

Cyclisations of Tryptophans. I. Trifluoroacetylation of Nb-Methoxycarbonyl-L-tryptophan Methyl Ester in Trifluoroacetic Acid.

Anthoni, Uffe; Christophersen, Carsten; Nielsen, Per Halfdan; Pedersen, Erik Jonas

Pages: 91-93.

DOI number: 10.3891/acta.chem.scand.48-0091
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Cyclisation of Tryptophans. III. The Crystal Structure of a Product Derived from Trifluoroacetylation of Nb-Methoxycarbonyl-L-Tryptophan Methyl Ester in Pyridine.

Anthoni, Uffe; Christophersen, Carsten; Obel, Andreas; Nielsen, Per Halfdan

Pages: 334-339.

DOI number: 10.3891/acta.chem.scand.48-0334
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A Racemic Diterpene from the Marine Bryozoan Flustra foliacea, Natural Product or Artefact?

Holst, Pia Bachmann; Anthoni, Uffe; Christophersen, Carsten; Nielsen, Per Halfdan; Bock, Klaus

Pages: 765-768.

DOI number: 10.3891/acta.chem.scand.48-0765
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Articles in volume 49 (1995)

An NMR and Raman Study of Trifluoroacetic Anhydride in Pyridine.

Anthoni, Uffe; Christensen, Daniel; Christophersen, Carsten; Nielsen, Per Halfdan

Pages: 203-206.

DOI number: 10.3891/acta.chem.scand.49-0203
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Cyclisations of Tryptophans. II. Protonated Species Derived from L-Tryptophan Methyl Ester and its Nb-Acetyl Derivative.

Anthoni, Uffe; Chortsen, Lone; Christophersen, Carsten; Nielsen, Per Halfdan

Pages: 441-445.

DOI number: 10.3891/acta.chem.scand.49-0441
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Articles in volume 51 (1997)

Cyclisations of Tryptophans. V. Trifluoroacetylation of Nb-Methoxycarbonyl-L-tryptophan Methyl Ester in Pyridine.

Anthoni, Uffe; Christophersen, Carsten; Nielsen, Per Halfdan; Pedersen, Erik Jonas

Pages: 407-410.

DOI number: 10.3891/acta.chem.scand.51-0407
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Articles in volume 52 (1998)

Cyclisations of Tryptophans. IV. Cyclisation of Nb-Acyl-L-Tryptophanamides.

Holst, Pia Bachmann; Anthoni, Uffe; Christophersen, Carsten; Larsen, Sine; Nielsen, Per Halfdan; Püschl, Ask

Pages: 683-693.

DOI number: 10.3891/acta.chem.scand.52-0683
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Stereochemistry of Dimerisation of Indole-3-acetic Acid and its Propyl Ester.

Fatum, Tine M.; Anthoni, Uffe; Christophersen, Carsten; Nielsen, Per Halfdan

Pages: 784-789.

DOI number: 10.3891/acta.chem.scand.52-0784
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Cyclisations of Tryptophans. VI. Cyclisation of L-Tryptophan Dipeptides by Oxygenation with Singlet Oxygen.

Anthoni, Uffe; Christophersen, Carsten; Nielsen, Per Halfdan; Christoffersen, Martin W.; Sørensen, Dan

Pages: 958-960.

DOI number: 10.3891/acta.chem.scand.52-0958
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