TiCl4-promoted aldol condensations of S-4-chlorophenyl thioesters with enals or dienals led to the production of dienyl or trienyl thioesters in good yields. Due to good crystallinity, products with high E/Z ratios were obtained by simple filtration in many cases. Reduction of the thioester moiety by DIBAL-H afforded the corresponding unsaturated aldehydes while suppressing the E/Z-isomerization and
Various thioesters were obtained through an efficient phase-transfer catalysis method, by treating several thiophenols with different acyl chlorides, in a biphasic system composed of 10% aqueous NaOH and dichloromethane in the presence of tetrabutylammonium chloride. The thiolation reaction was complete in only 5 minutes, at 0 degrees C.
ALIEV I. A.; SULTANOV YU. M., ELMI EHSEHRLEHR. AZEHRB. UNIV. KIMJA ELMLEHRI CEP., NAUCH. TR. AZERB. YH-+