Autor: Jerzy Peszke (j.peszke_at_rocketmail.com)
Data: Wed 13 Mar 2002 - 14:36:33 MET

• Następna wiadomość: Karolina Onderko: "reklamy"
• Poprzednia wiadomość: Tricomed NAUKA: "Powitanie i podziekowania"
• W odpowiedzi na: Michal Sobkowski: "Re: Specyficzne reakcje Dielsa-Aldera"

Czesc,

Znalazlem m. in i te publikacje. Znalazlem rowniez i mechanizmy tych reakcji. Osobna sprawa ile mi to zajelo czasu.

Jurek

• Michal Sobkowski <msob_at_ibch.poznan.pl> wrote:
  > At 15:21 04.03.02, Jerzy Peszke wrote:
  > >Poszukuje informacji o reakcjach Dielsa-Aldera:
  > retro
  > >i domino.
  >
  > Z Beilsteina po jednym trafieniu na "Domino/Retro
  > Diels-Alder reactions":
  >
  > Authors: Sander, Michael; Dehmlow, Eckehard
  > Volker
  > Journal Title: Eur.J.Org.Chem.
  > Number: 2
  > Publication Year: 2001
  > Page: 399 - 404
  > Title: Synthesis of a Substituted
  > Bi[cyclohepta-3,5(3',5')-dienyl]: A
  > Possible Building Block for Domino Diels-Alder
  > Reactions
  > Abstract: A versatile 13-step synthesis of
  >
  1,1'-dimethoxy-4,4'5,5'-tetrakis(trimethylsilyloxy)bicyclohepta-3,3'5,5'-dienyl
  >
  > (11) is described. 11 represents a potential
  > building block for the
  > construction of polycyclic cage compounds through
  > domino Diels-Alder and
  > pincer reactions.
  > Keywords: Domino Diels-Alder reactions; Pincer
  > reactions; Substituted
  > 1,1'-dihydroxybi(cycloheptadienyl)/McMurry reactions
  >
  >
  > Authors: Klaerner, Frank-Gerrit; Breitkopf,
  > Volker
  > Journal Title: Eur.J.Org.Chem.
  > Number: 11
  > Publication Year: 1999
  > Page: 2757 - 2762
  > Title: The Effect of Pressure on Retro Diels-Alder
  > Reactions
  > Abstract: The activation and reaction volumes
  > ($DV(excit.)/$DV) were
  > determined for the retro Diels-Alder reactions of
  > the parent
  > dihydrobarrelene 1a, its 2-cyano derivative 1b, the
  > exo and endo
  > Diels-Alder adducts of maleic anhydride to
  > naphthalene exo-, endo-4, and
  > the exo and endo Diels-Alder adducts of
  > N-phenylmaleic imide to
  > 6,6-dimethylfulvene exo-, endo-8 from the pressure
  > dependence of the rate
  > constants and the partial molar volumes (V) of
  > reactants and products at
  > various temperatures. The cleavage of exo-4, endo-4,
  > and exo-8 are slightly
  > accelerated by pressure showing negative volumes of
  > activation
  > ($DV(excit.)<0) whereas the others are slightly
  > retarded ($DV(excit.)>0).
  > From the analysis of the volume data including the
  > van der Waals volumes
  > (V&W%) one can conclude that the packing
  > coefficients of the pericyclic
  > transition states are equal to or even larger than
  > those of the
  > corresponding Diels-Alder adducts. This finding may
  > be explained with the
  > restriction of the degrees of freedom in the
  > transition states leading to a
  > contraction of the expansion volume.
  > Keywords: High-pressure chemistry; Activation
  > volumes; Reaction
  > volumes; Packing coefficients; Retro Diels-Alder
  > reactions
  >
  > Pozdrawiam,
  > Michał
  >
  > --
  > dr Michał Sobkowski
  > Instytut Chemii Bioorganicznej PAN,
  > Poznań
  >
  > http://www.man.poznan.pl/private/users/msob.html
  >
  >
  >
  >
  

  ---

• Następna wiadomość: Karolina Onderko: "reklamy"
• Poprzednia wiadomość: Tricomed NAUKA: "Powitanie i podziekowania"
• W odpowiedzi na: Michal Sobkowski: "Re: Specyficzne reakcje Dielsa-Aldera"

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