scholarly journals Lewis Acid Catalysis of the Diels–Alder Reaction Using Niobium and Tantalum Chlorides in the Presence of Coordinating Ligands

Molecules ◽  
2000 ◽  
Vol 5 (12) ◽  
pp. 993-997 ◽  
Author(s):  
Joshua Howarth ◽  
Kevin Gillespie
1996 ◽  
Vol 118 (33) ◽  
pp. 7702-7707 ◽  
Author(s):  
Sijbren Otto ◽  
Federica Bertoncin ◽  
Jan B. F. N. Engberts

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