Palladium catalyzed hydro-carbonation of allenes with pronucleophiles
- Tohoku Univ., Sendai (Japan)
The addition of pronucleophiles to dialkyl- or monoalkylallenes is catalyzed by Pd{sub 2}(dba){sub 3}{sm_bullet}CHCl{sub 3}/dppb to give the terminal({gamma}) adducts. The regioselectivity of the addition of pronucleophiles is highly dependent upon the substituent of allenes. Arylallenes having an electron withdrawing group at the para-position afford the {beta}-adducts, whereas alkoxy(or phenoxy)allenes give the {alpha}-adducts. The palladium catalyzed reaction of allylstannanes with pronucleophiles produces the corresponding allylated derivatives in good to high yields. The reaction of allenyl- and propargyl-stannanes with pronucleophiles in the presence of palladium catalyst gives the double addition products. The reaction mechanism of the above reactions will be discussed.
- OSTI ID:
- 250066
- Report Number(s):
- CONF-9508100--
- Country of Publication:
- United States
- Language:
- English
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