𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Pilot as a testing ground for promoting the patent system in China

Book ID
107926970
Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
296 KB
Volume
16
Category
Article
ISSN
0172-2190

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The N,O-bridged sesquinorbornadienes: a
The N,O-bridged sesquinorbornadienes: a testing ground for establishing the superiority of N-Z pyrrole over furan as a dienofuge in retro-Diels–Alder reactions
✍ Ronald N Warrener; Davor Margetic; Guangxing Sun πŸ“‚ Article πŸ“… 2001 πŸ› Elsevier Science 🌐 French βš– 68 KB

N-R pyrroles (R=H, Z, COPh but not Bn, TMS) 6 add selectively at rt to the substituted p-bond of 2,3-bis(trifluoromethyl)-7-oxanorbornadiene 7 under high pressure (14 kbar) to form exclusively the syn-facial N,O-sesquinorbornadienes 8; at higher temperatures the thermodynamic stereoisomers 10,11 are