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1

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Notizen Eine Synthese von Nornikotin‐ und Nikotin‐2‐carboxamid

Langhals, Elke ; Langhals, Heinz ; Rüchardt, Christoph

Wiley ; 1983

In: Liebigs Annalen der Chemie Vol. 1983, No. 2 ( 1983-02-15), p. 330-333

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In: Liebigs Annalen der Chemie, Wiley, Vol. 1983, No. 2 ( 1983-02-15), p. 330-333

Abstract: A Synthesis for Nornicotine‐ and Nicotine‐2‐carboxamide 5‐(2‐Pyrrolidinyl)pyridine‐2‐carboxamide ( 6 ) (R = H) was prepared starting from readily available 4‐oxo‐4‐(3‐pyridyl)butyronitrile ( 4 ) in three steps in an overall yield of 33% and was methylated in a Leuckart‐Wallach reaction to yield 6 (R = CH 3 ) in 68% yield. The key step of the synthesis is the regioselective introduction of the carbamoyl group via Minisci reaction

Type of Medium: Online Resource

ISSN: 0170-2041

URL: Issue

URL: Article

DOI: 10.1002/jlac.v1983:2

DOI: 10.1002/jlac.198319830217

Language: English

Publisher: Wiley

Publication Date: 1983

detail.hit.zdb_id: 1475010-7

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2

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Eine einfache Synthese von 3‐Methoxypyridin und seinen Analogen durch Alkylierungsreaktionen

Finkentey, Christel ; Langhals, Elke ; Langhals, Heinz

Wiley ; 1983

In: Chemische Berichte Vol. 116, No. 6 ( 1983-06), p. 2394-2397

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In: Chemische Berichte, Wiley, Vol. 116, No. 6 ( 1983-06), p. 2394-2397

Type of Medium: Online Resource

ISSN: 0009-2940

URL: Issue

URL: Article

DOI: 10.1002/cber.v116:6

DOI: 10.1002/cber.19831160631

Language: English

Publisher: Wiley

Publication Date: 1983

detail.hit.zdb_id: 1475009-0

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3

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Eine einfache neue Synthese der Fusarinsäure und anderer 5-Alkyl-2-pyridincarbonsäuren

Langhals, Elke ; Langhals, Heinz ; Rüchardt, Christoph

Wiley ; 1982

In: Liebigs Annalen der Chemie Vol. 1982, No. 5 ( 1982-05-17), p. 930-949

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In: Liebigs Annalen der Chemie, Wiley, Vol. 1982, No. 5 ( 1982-05-17), p. 930-949

Type of Medium: Online Resource

ISSN: 0170-2041 , 1099-0690

URL: Issue

URL: Journal

URL: Article

DOI: 10.1002/jlac.v1982:5

DOI: 10.1002/(ISSN)1099-0690

DOI: 10.1002/jlac.198219820513

Language: German

Publisher: Wiley

Publication Date: 1982

detail.hit.zdb_id: 1475010-7

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4

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Alkylation of ketones by use of solid KOH in dimethyl sulfoxide

Langhals, Elke ; Langhals, Heinz

Elsevier BV ; 1990

In: Tetrahedron Letters Vol. 31, No. 6 ( 1990-1), p. 859-862

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In: Tetrahedron Letters, Elsevier BV, Vol. 31, No. 6 ( 1990-1), p. 859-862

Type of Medium: Online Resource

ISSN: 0040-4039

URL: Article

DOI: 10.1016/S0040-4039(00)94647-1

RVK:

VA 7560

Language: English

Publisher: Elsevier BV

Publication Date: 1990

detail.hit.zdb_id: 2007074-3

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5

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Der Nachweis eines Radikalketten‐Mechanismus für die Knabe‐Reaktion von 1,2‐Dihydro‐2‐methylpapaverin

Langhals, Elke ; Langhals, Heinz ; Rüchardt, Christoph

Wiley ; 1984

In: Chemische Berichte Vol. 117, No. 4 ( 1984-04), p. 1436-1454

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In: Chemische Berichte, Wiley, Vol. 117, No. 4 ( 1984-04), p. 1436-1454

Abstract: Evidence for a Radical Chain Mechanism for the Knabe Reaction of 1,2‐Dihydro‐2‐methylpapaverine A free radical chain mechanism is proposed for the Knabe reaction and the accompanying elimination reaction on account of their nonintegral reaction order and of successful inhibition experiments. 3,4‐Dimethoxybenzyl radicals are the chain carrying species. Battersby 's synthesis of N ‐methylpavine ( 19 ) from 1,2‐dihydro‐2‐methylpapaverine ( 9 ) is dependent on the presence of formic acid as radical chain inhibitor. In the presence of inhibitors 1‐benzyl‐1,4‐dihydro‐2‐methyl‐isoquinolinium ions like 10 are persistent species whose chemistry can now be investigated.

Type of Medium: Online Resource

ISSN: 0009-2940

URL: Issue

URL: Article

DOI: 10.1002/cber.v117:4

DOI: 10.1002/cber.19841170414

Language: English

Publisher: Wiley

Publication Date: 1984

detail.hit.zdb_id: 1475009-0

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6

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Eine einfache Synthese der 5‐Cyan‐2‐pyridincarbonsäure und ihres Amids

Langhals, Elke ; Langhals, Heinz ; Rüchardt, Christoph

Wiley ; 1984

In: Chemische Berichte Vol. 117, No. 3 ( 1984-03), p. 1259-1261

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In: Chemische Berichte, Wiley, Vol. 117, No. 3 ( 1984-03), p. 1259-1261

Type of Medium: Online Resource

ISSN: 0009-2940

URL: Issue

URL: Article

DOI: 10.1002/cber.v117:3

DOI: 10.1002/cber.19841170340

Language: English

Publisher: Wiley

Publication Date: 1984

detail.hit.zdb_id: 1475009-0

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7

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Cyanine Dyes as Optical Contrast Agents for Ophthalmological Surgery

Langhals, Heinz ; Varja, Ana ; Laubichler, Peter ; [et al.]

American Chemical Society (ACS) ; 2011

In: Journal of Medicinal Chemistry Vol. 54, No. 11 ( 2011-06-09), p. 3903-3925

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In: Journal of Medicinal Chemistry, American Chemical Society (ACS), Vol. 54, No. 11 ( 2011-06-09), p. 3903-3925

Type of Medium: Online Resource

ISSN: 0022-2623 , 1520-4804

URL: Article

DOI: 10.1021/jm2001986

Language: English

Publisher: American Chemical Society (ACS)

Publication Date: 2011

detail.hit.zdb_id: 1491411-6

SSG: 15,3

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8

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Correction to: Heterocyclic Structures Applied as Efficient Molecular Probes for the Investigation of Chemically Important Interactions in the Liquid Phase

Langhals, Heinz

Springer Science and Business Media LLC ; 2021

In: Chemistry of Heterocyclic Compounds Vol. 57, No. 5 ( 2021-05), p. 609-609

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In: Chemistry of Heterocyclic Compounds, Springer Science and Business Media LLC, Vol. 57, No. 5 ( 2021-05), p. 609-609

Type of Medium: Online Resource

ISSN: 0009-3122 , 1573-8353

URL: Article

DOI: 10.1007/s10593-021-02953-z

Language: English

Publisher: Springer Science and Business Media LLC

Publication Date: 2021

detail.hit.zdb_id: 2037128-7

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9

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A new and versatile fluorescence standard for quantum yield determination

Kalinin, Stanislav ; Speckbacher, Marcus ; Langhals, Heinz ; [et al.]

Royal Society of Chemistry (RSC) ; 2001

In: Physical Chemistry Chemical Physics Vol. 3, No. 2 ( 2001), p. 172-174

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In: Physical Chemistry Chemical Physics, Royal Society of Chemistry (RSC), Vol. 3, No. 2 ( 2001), p. 172-174

Type of Medium: Online Resource

ISSN: 1463-9076 , 1463-9084

URL: Article

DOI: 10.1039/b007671f

Language: Unknown

Publisher: Royal Society of Chemistry (RSC)

Publication Date: 2001

detail.hit.zdb_id: 1476283-3

detail.hit.zdb_id: 1476244-4

detail.hit.zdb_id: 1460656-2

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10

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Red shining silica: macroscopic pigments and nanoparticles by silylation

Langhals, Heinz ; Esterbauer, Andreas J. ; Kinzel, Simon

Royal Society of Chemistry (RSC) ; 2009

In: New Journal of Chemistry Vol. 33, No. 9 ( 2009), p. 1829-

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In: New Journal of Chemistry, Royal Society of Chemistry (RSC), Vol. 33, No. 9 ( 2009), p. 1829-

Type of Medium: Online Resource

ISSN: 1144-0546 , 1369-9261

URL: Article

DOI: 10.1039/b9nj00203k

Language: English

Publisher: Royal Society of Chemistry (RSC)

Publication Date: 2009

detail.hit.zdb_id: 1472933-7

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Kooperativer Bibliotheksverbund

Berlin Brandenburg