Structure-reactivity correlations are developed and used to test a biradical mechanism for gas-phase thermal Diels-Alder reactions of cyclohexa-1,3-diene with substituted ethenes and reverse reactions. 0 1994 John Wiley & Sons, Inc.
Selectivity–reactivity correlations for thermal Diels–Alder reactions of cyclohexa-1,3-diene with substituted Ethenes in the gas phase
✍ Scribed by B. Van Mele; G. Huybrechts
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 432 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0538-8066
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✦ Synopsis
Selectivity-reactivity correlations are shown to support a biradical pathway for the gas phase thermal Diels-Alder reactions of cyclohexa-1,3-diene with substituted ethenes except for those involving a carbonyl group.
* All cycloadducts are considered as endo or ex0 according to the orientation of substituent Y '. For disubstituted dienophiles Y 1 must be the variable substituent and Y 2 , Y ' , or Y are always CH, groups.
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The reactions k N n m endo-5-Ybicyclo[2.2.2loct-2-ene (NYBO) eno-5-Ybicyclo[2.2.2loct-2-ene (XYBO) O + < , < (YE) KXYBO (CHD) where Y = CH, (MI, C,H, (E), i-C,H, (I), and t-C,H, (TI have been studied between 488 and 606 K. The pressures of CHD ranged from 16 to 124 torr and those of YE from 57 to 62
The kinetics of the Diels-Alder additions of CH,= CHCHO, CH2= C(CHdCH0, and CH2= CHC(CH,)O to cyclohexa-1,3-diene (CHD) have been studied in the gas phase. The stereochemistry and the mechanism of these reactions are discussed. In contrast with other Diels-Alder additions involving CHD as diene, a b
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## Abstract The addition of ethene to cyclohexa‐1,3‐diene has been studied between 466 and 591 K at pressures ranging from 27 to 119 torr for ethene and 10 to 74 torr for cyclohexa‐1,3‐diene. The reaction is of the “Diels–Alder” type and leads to the formation of bicyclo[2.2.2]oct‐2‐ene. It is homo
## Abstract The Diels–Alder addition of acrolein to cyclohexa‐1,3‐diene has been studied between 486 and 571°K at pressures ranging from 55 to 240 torr. The products are endo‐ and exo‐5‐formylbicyclo[2.2.2]oct‐2‐ene (endo‐ and exo‐FBO), and their formations are second order. The rate constants (in