Pyridino‐protophane mit Alkylensegmenten wechselnder Länge

Kauffmann, Thomas; Beißner, Gerhard; Maibaum, Rüdiger

doi:10.1002/ange.19710832006

Cited by 18 publications

(1 citation statement)

References 3 publications

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“…The mechanistic significance of this observation has been questioned (Huisgen, 1984), however, because the isolated yields of the cycloadducts were rather low. The exclusive formation (Scheme 1) of a single 3-vinylpyrrolidine, (3), in the reaction of this anion with 1,3-dienes, (2) (Kauffmann & Eidenschink, 1971), would be additional evidence for a concerted cycloaddition, but quite recently, [4+3]-cycloaddition and 1,4-addition products [(5) and (6), respectively] were found to be formed in moderate yields when the 1,3-diphenyl-2-azaallyl anion, (1), was combined with 3,3,4,4,5,5-hexamethyl-1,2-bis(methylene)cyclopentane, (4) (Mayr et al, 1993) (Scheme 2). Both reaction partners showed ~4 reactivity resulting in the formation of a seven-membered ring.…”

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confidence: 99%

Racemic 3-Methyl-r-2,c-3,c-5-triphenylpyrrolidine and 3-Methyl-r-2,t-3,c-5-triphenylpyrrolidine

Jerzykiewicz¹,

Lis²,

Baran³

et al. 1998

Acta Crystallogr C

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Techniques for the design, construction, and evaluation of a 10-db directional coupler, a 0 to 40 db variable attenuator, a 90-degree phase shifter, and a duplexer to operate in the 300 to 1000 Gc region were investigated theoretically and experimentally. Quasi-optical, oversize, trough, and Goubau-beam waveguide were studied. Quasi-optical techniques used in oversize wave-guide were found to be most 6uitable and were used in constructing the components. These components were evaluated at 0.9-mm wavelength. The experimental data showed good agreement with the design theory. Thus, submillimeter components using quasi-optical techniques in oversize waveguide can be successfully designed and fabricated. Some components had higher insertion loss than desired due to the dielectric dissipation effects. These losses are reduced by using a multiple-dielectric-slab coupling structure.

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mentioning

confidence: 99%

Racemic 3-Methyl-r-2,c-3,c-5-triphenylpyrrolidine and 3-Methyl-r-2,t-3,c-5-triphenylpyrrolidine

Jerzykiewicz¹,

Lis²,

Baran³

et al. 1998

Acta Crystallogr C

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Substitution Reactions Using Organocopper Reagents

Posner

2011

Organic Reactions

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Carbon‐carbon sigma‐bond formation one of the most fundamental operations in organic chemistry, is often accomplished by interaction of an organometallic reagent with an organic substrate having a suitable leaving group. Selective substitution of halogens and of alcohol derivatives by various hydrocarbon groups in many different types of organic substrates has been achieved most successfully using organocopper reagents. The wide scope and effectiveness of these reagents in coupling with halides and alcohol derivatives have made formation of the unsymmetrical coupling product R‐R' a useful reaction in organic synthesis, allowing efficient and specific substitution of X by alkyl, alkenyl, alkynyl, or aryl groups. Because selective coupling between organic substrate and organocopper reagent is usually achieved more effectively by stoichiometric than by catalytic organocopper reagents, and more effectively still by organocuprates(I) than by mono‐copper or by complexed organocopper reagents, the emphasis in this chapter is on organocuprates (I). Consideration is given to possible mechanisms of substitution reactions using organocopper reagents, to scope, limitations, and synthetic utility of these reactions, and to optimal experimental considerations for their application.

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Organoalkali Chemistry

Schlosser

2001

Organometallics in Synthesis: A Manual

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Pyridino‐protophane mit Alkylensegmenten wechselnder Länge

Abstract: rnit verlaufen die Cycloadditionen anscheinend stereospezifisch, was ebenso wie das Nichtauftreten von sieben-

Cited by 18 publications

References 3 publications

Racemic 3-Methyl-r-2,c-3,c-5-triphenylpyrrolidine and 3-Methyl-r-2,t-3,c-5-triphenylpyrrolidine

Racemic 3-Methyl-r-2,c-3,c-5-triphenylpyrrolidine and 3-Methyl-r-2,t-3,c-5-triphenylpyrrolidine

Substitution Reactions Using Organocopper Reagents

Organoalkali Chemistry

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