The desulfurization of 1,3-bis(phenylthio)alk-1-enes with the low valent titanium species Cp2Ti[P(OEt)(3)](2) and subsequent reaction with tert-alkyl chlorides gave the terminal olefins regioselectively. The similar reactions also took place when beta,gamma-unsaturated thioacetals were treated successively with the titanocene(II) species and tert-alkyf chlorides, it was suggested that the present reactions proceeded via the formation of Q-vinyltitanium intermediate. (C) 1999 Elsevier Science I,td. All rights reserved.
Entirely Solvent-Free Procedure for the Synthesis of Distillable 1,3-Dithianes Using Lithium Tetrafluoroborate as a Reusable Catalyst
作者:Tsuneo Sato、Kiyoshi Kazahaya、Shinya Tsuji
DOI:10.1055/s-2004-829084
日期:——
Treatment of various types of aldehydes and ketones with 1,3-propanedithiol in the presence of a catalytic amount of lithium tetrafluoroborate at 25 °C under solvent-free conditions followed by direct purification by distillation of the resulting mixture affords the corresponding 1,3-dithianes in good to excellent yields. Chemoselective protection of keto aldehydes is also successfully achieved over the catalyst. The catalyst can be recovered and reused.