Cascade Synthesis of (E)-2-Alkylidenecyclobutanols
摘要:
A facile, one-pot reaction cascade condenses 1,1,1-trichloroalkanes with alpha,beta-unsaturated ketones to unexpectedly furnish moderate to good yields of (E)-2-alkylidenecyclobutanols.
Generation of Nucleophilic Chromium Acetylides from gem-Trichloroalkanes and Chromium Chloride: Synthesis of Propargyl Alcohols
作者:Dhurke Kashinath、Steve Tisserand、Narender Puli、John R. Falck、Rachid Baati
DOI:10.1002/ejoc.200901476
日期:2010.4
terminal alkynes, formed in situ through the Fritsch- Buttenberg-Wiechell (FBW) rearrangement, whereas Cr(III) acetylides are concomitantly generated by HCl elimination from the chromium(III) vinylidene carbenoid. Both divergent pathways result, overall, in the formation of nucleophilic acetylides. In situ trapping with electrophilic aldehydes afforded propargyl alcohols. Furthermore, deuteration experiments
A method of producing an aromatic ketone and an aromatic ketone composition containing it
申请人:TORAY INDUSTRIES, INC.
公开号:EP1053990A2
公开(公告)日:2000-11-22
In a method of producing an aromatic ketone an aromatic compound having an R-CH2 group ( R denotes an alkyl group, aryl group, allyl group or aralkyl group) is oxidised in liquid phase by an oxygen-containing gas in the presence of a catalyst comprising a heavy metal compound and at least one compound selected from (1) ammonia, (2) organic basic compounds and (3) onium halides while the water produced in the reaction is removed from the reaction solution.
An aromatic ketone composition produced by the process comprises the aromatic ketone and 10 ppm to 3 wt% of at least one compound selected from: a benzene derivative of the formula (II)
a vinylbenzene of the formula (III)
a benzaldehyde of the formula (IV)
where X is a substituent; n is zero or 1 to 5; R is alkyl, aryl, allyl or aralkyl and R1 is hydrogen, alkyl, aryl, allyl or aralkyl.
Chromium–Carbyne Complexes: Intermediates for Organic Synthesis
作者:Romain Bejot、Anyu He、John R. Falck、Charles Mioskowski
DOI:10.1002/anie.200604015
日期:2007.2.26
A mechanistic study of the chromium(II)-mediated transformations of trichloromethyl alkyls and carbinols: evidence for carbene, carbyne, and carbenoid intermediates
作者:Romain Bejot、Steve Tisserand、De Run Li、J.R. Falck、Charles Mioskowski
DOI:10.1016/j.tetlet.2007.03.150
日期:2007.5
Using CrCl2 in THF at room temperature, trichloromethyl carbinols and trichloromethylalkanes are readily transformed to the highly reactive alpha-chlorocarbenes, carbynes and alpha-chloro-alpha-chromium(III) vinylidene carbenoids. A mechanistic study is carried out to determine the nature of the intermediates. (C) 2007 Elsevier Ltd. All rights reserved.
A convenient synthesis of (Z)-1-chloro-1-alkenes and (Z)-1-chloro-2-alkoxy-1-alkenes
Mild, room temperature CrCl2 reduction of 1,1,1-trichloroalkanes stereoselectively generates (Z)-1-chloro-2-substituted-1-alkenes in excellent yields. (C) 2002 Elsevier Science Ltd. All rights reserved.