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1,1,2,2‐Tetraethynylethanes: Synthons for Tetraethynylethenes and Modules for Acetylenic Molecular Scaffolding † (2004)

Tykwinski, Rik R. [Verfasser] ; Diederich, François [Verfasser] ; Seiler, Paul [Verfasser] ; [et al.]

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UID:

(DE-101)1310712301

Format: Online-Ressource

ISSN: 1522-2675

Content: Abstract: The synthesis of functionalized 1,1,2,2‐tetraethynylethanes (= 3,4‐diethynylhexa‐1,5‐diynes) as synthons for tetraethynylethenes (3,4‐diethynylhex‐3‐ene‐1,5‐diynes) and as building blocks for three‐dimensional acetylenic molecular scaffolding targeting the synthesis of the molecular carbon belts 3 and 4 is reported (Scheme 1). Reaction of diethyl oxalate and (trialkylsilyl) ethynyl Grignard reagents afforded the silyl‐protected 3,4‐diethynylhexa‐1,5‐diyne‐3,4‐ diols 7 and 8 which were transformed in high yields into the cyclic carbonate 9 and the cyclic orthoesters 10–13, respectively (Scheme 2). The solid‐state structures of 9 and 10 were elucidated by X‐ray crystallography. The alkyne protecting groups in 9, 10, and 12 were smoothly removed to give the free tetraynes 14–16 as relatively stable oils in nearly quantitative yields (Scheme 3). Orthoesters 15 and 16 underwent Pd‐catalyzed cross‐coupling with iodobenzene to give the tetraphenyl derivatives 17 and 18 (Scheme 4). Thermal acid‐catalyzed elimination of the orthoester moieties in 12 and 13 produced the silyl‐protected tetraethynylethenes 19 and 20 and concluded a novel, simple three‐step synthesis of these fully two‐dimensionally conjugated π‐chromophores (Scheme 5).

In: volume:79

In: number:3

In: year:2004

In: pages:634-645

In: extent:12

In: Helvetica chimica acta, New York, NY : Wiley-VCH, 1918-, 79, Heft 3 (2004), 634-645 (gesamt 12), 1522-2675

Language: English

DOI: 10.1002/hlca.19960790306

URN: urn:nbn:de:101:1-2023112205473885835140

URL: https://doi.org/10.1002/hlca.19960790306

URL: https://nbn-resolving.org/urn:nbn:de:101:1-2023112205473885835140

URL: https://d-nb.info/1310712301/34

URL: https://doi.org/10.1002/hlca.19960790306

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(1,1‐bis (trimethylsilyl))‐1 H ‐cyclopropa (b) napththalene (tricarbonyl‐chromium): The first arene‐chromium complex of a cycloproparene (2004)

Müller, Paul [Verfasser] ; Bernardinelli, Gérald [Verfasser] ; Jacquier, Yvan [Verfasser]

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UID:

(DE-101)132229819X

Format: Online-Ressource

ISSN: 1522-2675

Content: Abstract: [1,1‐Bis (trimethylsilyl)]‐1 H ‐cyclopropa [b] naphthalene rricarbonylchromium (2) was synthesized by reaction of 1,1‐bis (trimethylsilyl) cyclopropa [b] naphthalene (1b) with tricarbonyltris (acetonitrile) chromium.

In: volume:71

In: number:5

In: year:2004

In: pages:1328-1330

In: extent:3

In: Helvetica chimica acta, New York, NY : Wiley-VCH, 1918-, 71, Heft 5 (2004), 1328-1330 (gesamt 3), 1522-2675

Language: English

DOI: 10.1002/hlca.19880710543

URN: urn:nbn:de:101:1-2024030204305213494343

URL: https://doi.org/10.1002/hlca.19880710543

URL: https://nbn-resolving.org/urn:nbn:de:101:1-2024030204305213494343

URL: https://d-nb.info/132229819X/34

URL: https://doi.org/10.1002/hlca.19880710543

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1, 1‐Difluoro‐1 H ‐cyclopropa (a) naphthalene (2004)

Müller, Paul [Verfasser] ; Nguyen‐Thi, Huong‐Can [Verfasser]

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UID:

(DE-101)1326164341

Format: Online-Ressource

ISSN: 1522-2675

In: volume:67

In: number:2

In: year:2004

In: pages:467-470

In: extent:4

In: Helvetica chimica acta, New York, NY : Wiley-VCH, 1918-, 67, Heft 2 (2004), 467-470 (gesamt 4), 1522-2675

Language: English

DOI: 10.1002/hlca.19840670217

URN: urn:nbn:de:101:1-2024041505260569462571

URL: https://doi.org/10.1002/hlca.19840670217

URL: https://nbn-resolving.org/urn:nbn:de:101:1-2024041505260569462571

URL: https://d-nb.info/1326164341/34

URL: https://doi.org/10.1002/hlca.19840670217

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1,1‐Dihalogenoanthra (b) cyclopropenes. Preliminary communication † (2004)

Müuller, Paul [Verfasser] ; Rey, Michel [Verfasser]

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UID:

(DE-101)1325565040

Format: Online-Ressource

ISSN: 1522-2675

Content: Abstract: 1,1‐Dichloro‐ and 1,1‐difluoroanthra [b]cyclopropene (1 and 2) are synthesized in 8 steps from the Diels‐Alder adduct of benzocyclobutene and maleic anhydride.

In: volume:64

In: number:1

In: year:2004

In: pages:354-356

In: extent:3

In: Helvetica chimica acta, New York, NY : Wiley-VCH, 1918-, 64, Heft 1 (2004), 354-356 (gesamt 3), 1522-2675

Language: English

DOI: 10.1002/hlca.19810640135

URN: urn:nbn:de:101:1-2024040904494401033299

URL: https://doi.org/10.1002/hlca.19810640135

URL: https://nbn-resolving.org/urn:nbn:de:101:1-2024040904494401033299

URL: https://d-nb.info/1325565040/34

URL: https://doi.org/10.1002/hlca.19810640135

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1,1‐Dimethyl‐1‐silacyclohexa‐2,4‐dien‐tricarbonyleisen Vorläufige Mitteilung † (2004)

Fink, Walter [Verfasser]

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UID:

(DE-101)1329244184

Format: Online-Ressource

ISSN: 1522-2675

Content: Abstract: 1,1‐Dimethyl‐2,3,4,5‐tetraphenyl‐1‐silacyclohexa‐2,4‐diene is isomerized by iron pentacarbonyl to 1,1‐dimethyl‐2,3,4,5‐tetraphenyl‐1‐silacyclohexa‐2,5‐diene. However, iron pentacarbonyl with 1,1‐dimethyl‐1‐sila‐cyclohexa‐2,4‐diene yields 1,1‐dimethyl‐1‐silacyclohexa‐2,4‐diene‐tricarbonyl‐iron.

In: volume:58

In: number:4

In: year:2004

In: pages:1205-1207

In: extent:3

In: Helvetica chimica acta, New York, NY : Wiley-VCH, 1918-, 58, Heft 4 (2004), 1205-1207 (gesamt 3), 1522-2675

Language: English

DOI: 10.1002/hlca.19750580425

URN: urn:nbn:de:101:1-2405140406125.795046684407

URL: https://doi.org/10.1002/hlca.19750580425

URL: https://nbn-resolving.org/urn:nbn:de:101:1-2405140406125.795046684407

URL: https://d-nb.info/1329244184/34

URL: https://doi.org/10.1002/hlca.19750580425

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1,1‐Disilyl‐2‐Alkenes: Preparation and Some Synthetic Applications. Preliminary communication † (2004)

Wetter, Hansjürg [Verfasser]

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UID:

(DE-101)1329992717

Format: Online-Ressource

ISSN: 1522-2675

Content: Abstract: Allyl sulfides and a selenide are metallated and silylated with chloro (penta‐methyl) disilane. Treatment of the resulting disilanylmethyl sulfides 4 with trimethyloxonium tetrafluoroborate furnishes 1,1‐disilyl‐2‐alkenes 5 in good yields. Some synthetic possibilities of 5 are outlined.

In: volume:61

In: number:8

In: year:2004

In: pages:3072-3075

In: extent:4

In: Helvetica chimica acta, New York, NY : Wiley-VCH, 1918-, 61, Heft 8 (2004), 3072-3075 (gesamt 4), 1522-2675

Language: English

DOI: 10.1002/hlca.19780610832

URN: urn:nbn:de:101:1-2405180622267.094801871116

URL: https://doi.org/10.1002/hlca.19780610832

URL: https://nbn-resolving.org/urn:nbn:de:101:1-2405180622267.094801871116

URL: https://d-nb.info/1329992717/34

URL: https://doi.org/10.1002/hlca.19780610832

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1,1‐Disilyl Alcohols as d 1 Synthons: Harnessing the 1,2‐ Brook Rearrangement (2002)

Fleming, Ian [Verfasser] ; Lawrence, Annabel J. [Verfasser] ; Richardson, Robert D. [Verfasser] ; [et al.]

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UID:

(DE-101)1306558166

Format: Online-Ressource

ISSN: 1522-2675

In: volume:85

In: number:10

In: year:2002

In: pages:3349-3365

In: extent:17

In: Helvetica chimica acta, New York, NY : Wiley-VCH, 1918-, 85, Heft 10 (2002), 3349-3365 (gesamt 17), 1522-2675

Language: English

DOI: 10.1002/1522-2675(200210)85:10〈3349::AID-HLCA3349〉3.0.CO;2-K

URN: urn:nbn:de:101:1-2023101905283953461264

URL: https://doi.org/10.1002/1522-2675(200210)85:10〈3349::AID-HLCA3349〉3.0.CO;2-K

URL: https://nbn-resolving.org/urn:nbn:de:101:1-2023101905283953461264

URL: https://d-nb.info/1306558166/34

URL: https://doi.org/10.1002/1522-2675(200210)85:10〈3349::AID-HLCA3349〉3.0.CO;2-K

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1,1′‐Disubstituted Ferrocene‐Containing Thermotropic Liquid Crystals of structure (Fe(η 5 ‐C 5 H 4) COOC 6 H 4 XC 6 H 4 OC n H 2n+1 } 2) (X OOC or COO). Influence of the orientation of the central ester function on the mesogenic properties (2004)

Deschenaux, Robert [Verfasser] ; Marendaz, Jean‐Lue [Verfasser] ; Santiago, Julio [Verfasser]

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UID:

(DE-101)1316722953

Format: Online-Ressource

ISSN: 1522-2675

Content: Abstract: The two series I and II of 1,1′ ‐disubstituted ferrocenes which differ by the direction of the ester function included in the rigid organic part were synthesized and their liquid crystal properties examined. These latter were found to be strongly dependent on the orientation of the connecting ester group and on the alkyl chain length.

In: volume:76

In: number:2

In: year:2004

In: pages:865-876

In: extent:12

In: Helvetica chimica acta, New York, NY : Wiley-VCH, 1918-, 76, Heft 2 (2004), 865-876 (gesamt 12), 1522-2675

Language: English

DOI: 10.1002/hlca.19930760210

URN: urn:nbn:de:101:1-2024012105521151946268

URL: https://doi.org/10.1002/hlca.19930760210

URL: https://nbn-resolving.org/urn:nbn:de:101:1-2024012105521151946268

URL: https://d-nb.info/1316722953/34

URL: https://doi.org/10.1002/hlca.19930760210

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1:1 Metal Complexes of Bivalent Cobalt, Nickel, Copper, Zink, and Cadmium with the Tripodal Ligand tris (2‐(dimethylamino) ethyl) amine: Their stabilities and the X‐ray crystal structure of its copper (II) complex sulfate (2004)

Anderegg, Giorgio [Verfasser] ; Gramlich, Volker [Verfasser]

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UID:

(DE-101)1316692981

Format: Online-Ressource

ISSN: 1522-2675

In: volume:77

In: number:3

In: year:2004

In: pages:685-690

In: extent:6

In: Helvetica chimica acta, New York, NY : Wiley-VCH, 1918-, 77, Heft 3 (2004), 685-690 (gesamt 6), 1522-2675

Language: English

DOI: 10.1002/hlca.19940770312

URN: urn:nbn:de:101:1-2024012006590335586674

URL: https://doi.org/10.1002/hlca.19940770312

URL: https://nbn-resolving.org/urn:nbn:de:101:1-2024012006590335586674

URL: https://d-nb.info/1316692981/34

URL: https://doi.org/10.1002/hlca.19940770312

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1,15‐Diferrocenyl‐2,5,8,11,14‐pentaazapentadecane, an Open‐Chain Redox‐Active Ferrocene‐Functionalized Polyazaalkane Ligand for Anions (1999)

Lloris, José M. [Verfasser] ; Martínez‐Máñez, Ramón [Verfasser] ; Padilla‐Tosta, Miguel E. [Verfasser] ; [et al.]

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UID:

(DE-101)1311130012

Format: Online-Ressource

ISSN: 1522-2675

In: volume:82

In: number:9

In: year:1999

In: pages:1445-1453

In: extent:9

In: Helvetica chimica acta, New York, NY : Wiley-VCH, 1918-, 82, Heft 9 (1999), 1445-1453 (gesamt 9), 1522-2675

Language: English

DOI: 10.1002/(SICI)1522-2675(19990908)82:9〈1445::AID-HLCA1445〉3.0.CO;2-#

URN: urn:nbn:de:101:1-2023112507080804214736

URL: https://doi.org/10.1002/(SICI)1522-2675(19990908)82:9〈1445::AID-HLCA1445〉3.0.CO;2-#

URL: https://nbn-resolving.org/urn:nbn:de:101:1-2023112507080804214736

URL: https://d-nb.info/1311130012/34

URL: https://doi.org/10.1002/(SICI)1522-2675(19990908)82:9〈1445::AID-HLCA1445〉3.0.CO;2-#

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Berlin Brandenburg