elemental analyses and mass spectra (ActivX Inc)
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ActivX Inc
elemental analyses and mass spectra
Elemental Analyses And Mass Spectra, supplied by ActivX Inc, used in various techniques. Bioz Stars score: 90/100, based on 1 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
https://www.bioz.com/product/elemental+analyses+and+mass+spectra/elemental+analyses+and+mass+spectra/10__1039_slash_p19760002562-123-11-4
Average 90 stars, based on 1 article reviews
Elemental Analyses And Mass Spectra, supplied by ActivX Inc, used in various techniques. Bioz Stars score: 90/100, based on 1 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
https://www.bioz.com/product/elemental+analyses+and+mass+spectra/elemental+analyses+and+mass+spectra/10__1039_slash_p19760002562-123-11-4
Average 90 stars, based on 1 article reviews
elemental analyses and mass spectra - by Bioz Stars,
2026-10
90/100 stars
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other:Article Title: Heterocycles by cycloaddition. Part 6. Cycloaddition–double fragmentation reactions of mesoionic compounds with an oxabicyclo[2.2.1]heptadiene: synthesis of five- and six-membered heterocycles Article Snippet: The reaction of dimethyl 7-oxabicyclo[2.2.1] hepta-2.5-diene-2.3-dicarboxyIate (1 ) with some five-membered mesoionic compounds [ (Z) and (1 O)] gave five-membered aromatic heterocycles [(6)-(9) and (1 2)] by thermal double fragmentation of the initially formed cycloadducts [(3), (4). and (1 l ) ] .. The periselectivity of the cycloaddition varies according to the mesoionic compound employed.. With a dithiolone (1 Oa) and a thiazolone (1 Ob). the cycloadducts (1 1 ) were isolable, and the corresponding S-oxides (1 3) were prepared. Article Title: Heterocycles by cycloaddition. Part 5. Preparation of 7,9-diheteratricyclo[4.2.1.02,5]non-3-en-8-one derivatives from mesoionic compounds Article Snippet: MESOIONIC compounds have found wide application in the synthesis of a variety of heterocyclic systems.. Apart from their well-established use in the preparation of five-membered heterocycles by cycloadditionextrusion reactions with olefins and acetylenes,2 they serve as starting materials for the preparation of sixmembered heterocycles by cycloaddition-extrusion-ring expansion reactions with small-ring olefins,3 and we have recently reported a novel synthetic approach t o both fiveand six-membered aromatic heterocycles by cycloaddition-double fragmentation reactions of mesoionic compounds with suitable bicyclic ole fin^.^^^ In this paper we describe the reactions of mesoionic compounds (1) with dimethyl tricyclo[4.2.2 .. 0 2 y 5] deca-3,7,9triene-7,8-dicarboxylate (2), the adduct of cyclo-octat etraene and dimethyl acet ylenedicarboxylat e. This ring system has three potentially available double bonds for cycloaddition, and the cycloadducts, if formed, may undergo fragmentation in a variety of ways. |