Allylstannation: IX. The preparation of 4-chloro-2,6-dialkyl-, 4-bromo-2,6-dialkyl-, (E/Z)-4-chloro-2,6-dialkyl-3-methyl-and (E/Z)-4-bromo-2,6-dialkyl-3-methyl-tetrahydropyrans by condensation of aldehydes with di- and tri-halides of allyltin
β Scribed by Andrea Boaretto; Donatella Furlani; Daniele Marton; Giuseppe Tagliavini; Alessandro Gambaro
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 620 KB
- Volume
- 299
- Category
- Article
- ISSN
- 0022-328X
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## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a βFull Textβ option. The original article is trackable v
The title compounds 4 are prepared from 4-alkyldioxins 2 via a metalation, alkylation sequence. The dialkyl dioxins 4 are thermally labile (providing enones) and undergo highly stereoselective hydroboration or hydrogenation reactions to provide enti,anti-1,2,3-triols and syn-1,3-diols, respectively.
The title glycosid-Iuloses were prepared from 3-nitro-@-D-three-hex-2-enopyranoside derivatives. 'H-N.m.r. spectral studies revealed that the 2-bromo-and 2-chloro-P-D-xylo-hexopyranosid-3-uloses readily equilibrated with their hydrates, but the remaining glycosid-3-uloses, including the cy-D-xylo an
The nickel complex 2 Ni shows reactivity about 10 3 times greater than that of the cobalt analogue 2 Co . The oxidation ability of the M III (m-O) 2 M III core should be affected by the hindered Tp R ligand system, which can stabilize the 2 oxidation state of the metal centers.