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Tetrahedron Letters
Volumn 29, Issue 2, 1988, Pages 175-178
Dramatic acceleration of the Diels-Alder reaction by adsorption on chromatography adsorbents
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EID: 8744246800     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4039(00)80045-3     Document Type: Article
Times cited : (115)
References (22)
  • 6
    • 84914311216 scopus 로고    scopus 로고
    • 2:substrates ratio to achieve a similar conversion rate.
  • 7
    • 84914311215 scopus 로고    scopus 로고
    • 2 with a subsequent mixing of the two dry powders at 20°.
  • 8
    • 84914311214 scopus 로고    scopus 로고
    • Under ordinary (uncatalyzed) LPC the adducts 3a → 3k could be obtained with comparable yields but only after thermolysis for 3-6h at 130-160°4.
  • 9
    • 84914310212 scopus 로고    scopus 로고
    • 20, GLC, PMR) with authentic samples.
  • 10
    • 84914310211 scopus 로고    scopus 로고
    • GLC indicated the presence of less that 3-5% of the minor isomers (“meta”, or exo). These are formed in 20–40% under conventional LPC4.
  • 11
    • 84914310210 scopus 로고    scopus 로고
    • 2 performed at -60° for 2h produced after similar reatment the mixture 4c + 4a in 45:55 ratio (GLC).
  • 12
    • 33947297157 scopus 로고
    • Ratio endo/exo - 96:4 (4a); 91:9 (4b); 88:12 (4c); for liquid phase reaction at 20° endo/exo= 80:20 (4a); 75:25 (4b); 80:20 (4c);
    • (1970) J. Amer. Chem. Soc. , vol.92 , pp. 6548
    • Kobuke1    Fuerio2    Furukawa3
  • 14
    • 0002462396 scopus 로고
    • Über die Kondensation des Furans und seiner Homologen mit α,β-ungesättigten Ketonen und AldehydenAufbau von Di-, Tri- und Tetraketonen der Fettreihe
    • Ene reaction of 7 or 8 with 2a was reported to proceed in the presence of acids at 130° (for 7) or 20° (for 8).
    • (1943) Berichte der deutschen chemischen Gesellschaft (A and B Series) , vol.76 , pp. 183
    • Alder1    Schmidt2
  • 15
    • 84914310209 scopus 로고    scopus 로고
    • 3. We are unable to find any data dealing with [4+2] cycloaddition between 8 and 2a.
  • 16
    • 84914310208 scopus 로고    scopus 로고
    • 2 at 20° within 1h.
  • 19
    • 84914265834 scopus 로고
    • For a review see, Important information on structural changes of the adsorbed substance due to the donor-acceptor interactions on the surface could be found in the studies of NMR spectra run with magic angle spinning
    • (1987) Kinetika and Katalys , vol.28 , pp. 13
    • Kazanski1
  • 22
    • 84914310207 scopus 로고    scopus 로고
    • The authors are grateful to the helpful discussions with Drs. A.A. Lopatkin, A.A. Slinkin, S.S. Yufit, and G.V. Lisichkin and to the donors of The Petroleum Research Fund, administered by the American Chemical Society, for partial support of this work.

* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.