Acyl derivatives of 4-phenyl-but-3-enylamine on treatment with phosphoryl chloride gave good yields of pyrrolines. Pyridine derivatives were not obtained.
Thioacetals are selectively transformed into two types of terminal olefins, one with one-carbon homologation and the other with two-carbon homologation, by treatment with a titanocene(II) species under ethylene. The mode of the reaction is controlled by changing the ligands coordinated to titanocene(II).