Titanium-Mediated Addition of Grignard Reagents to Acyl Cyanohydrins: Aminocyclopropane versus 1,4-Diketone Formation
作者:Paul Setzer、Gwénaël Forcher、Fabien Boeda、Morwenna S. M. Pearson-Long、Philippe Bertus
DOI:10.1002/ejoc.201301251
日期:2014.1
The 1,2-dianion reactivity of the reagent generated from EtMgBr and titanium isopropoxide was illustrated when N-acyl cyanohydrins were used as substrates (>20 examples), giving both aminocyclopropane derivatives and 1,4-dicarbonyl compounds. When the reaction was performed in diethyl ether, 5-hydroxy-1,4-diketones were the main product. Under specific conditions (use of tetrahydrofuran and a bulky
Convenient and easy access to 2-hydroxycyclopent-2-enones from acylcyanohydrins
作者:Mathilde Pantin、Florent Bodinier、Jordan Saillour、Yassine M. Youssouf、Fabien Boeda、Morwenna S.M. Pearson-Long、Philippe Bertus
DOI:10.1016/j.tet.2019.07.010
日期:2019.8
A convenientaccess to 2-hydroxycyclopentenones was designed from acylcyanohydrins, by using titanacyclopropane complexes as nucleophilic partners and an intramolecular aldol condensation in basic conditions. The development of a one-pot procedure allows a step- and atom-economic process, and the use of Grignard reagents other than ethylmagnesium bromide provided valuable 3,4-disubstituted 2-hydroxycyclopentenones
Disperse Azo Dyes, A Process for the Preparation Thereof and the Use Thereof
申请人:Huntsman International LLC
公开号:US20150197637A1
公开(公告)日:2015-07-16
The present invention relates to azo dyes of formula (1), wherein R
1
denotes C
1
-C
12
alkyl which is unsubstituted or substituted by one or more C
1
-C
12
alkoxy groups, hydroxyl groups, amino groups, cyano groups or halogen atoms and which may be interrupted one or more times by the radical —O—, —S—, —COO— or —OOC—: R
4
is hydrogen or C
1
-C
12
alkyl; either R
2
is cyano and R
3
is halogen or R
2
is halogen and R
3
is cyano; and Ar represents a carbocyclic or heterocyclic aromatic radical, to the process for the preparation thereof, to mixtures containing said dyes and to the use thereof in dyeing or printing semi-synthetic and especially synthetic hydrophobic fibre materials, more especially textile materials.