[EN] IMPROVEMENTS IN OR RELATING TO ORGANIC COMPOUNDS<br/>[FR] PERFECTIONNEMENTS APPORTÉS À DES COMPOSÉS ORGANIQUES OU AYANT TRAIT À CEUX-CI
申请人:GIVAUDAN SA
公开号:WO2015059290A1
公开(公告)日:2015-04-30
A process of converting a carbon-carbon multiple bond to a cyclopropane ring, comprising the addition of a N-alkyl-N-nitroso compound to a mixture of alkene precursor, aqueous base and Pd(II)-catalyst, with the N-alkyl-N-nitroso compound obtained directly from an alkyl amine derivative, NaNO2 and an acid via phase separation of the N-alkyl-N-nitroso compound from the aqueous phase.
Diels–Alder reactions of alkyl-substituted dienes with acrylonitriles give good yields and endo-selectivities if catalyzed by (organo)aluminum, (organo)boron or gallium halides. The activity of these group IIIa Lewisacids in this reaction correlates with the coordination strength of their nitrile complexes, which deactivate Lewisacids sufficiently, so that the subsequently added diene partner undergoes
[EN] PROCESS FOR MAKING A CONJUGATED DIENE FROM AN ALLYL ALCOHOL<br/>[FR] PROCÉDÉ DE FABRICATION D'UN DIÈNE CONJUGUÉ À PARTIR D'UN ALCOOL D'ALLYLE
申请人:GIVAUDAN SA
公开号:WO2021255052A1
公开(公告)日:2021-12-23
An in-situ method for making a conjugated diene from an allyl alcohol comprising the conversion of the allyl alcohol to an allyl carbonate, allyl ester or allyl formate with concomitant or subsequent conversion of the allyl carbonate, allyl ester or allyl formate to the conjugated diene; the products obtained by said method, and the uses of said products.
Cu-catalyzed regioselective borylcyanation of 1,3-dienes
作者:Lu Wen、Haiyan Zhang、Jiping Wang、Fanke Meng
DOI:10.1039/c8cc07032f
日期:——
Catalytic regioselective generation of an allyl–Cu complex through Cu–B(pin) (pin = pinacolato) addition to 1,3-dienes followed by reaction with an electrophilic cyanation reagent to afford multifunctional organoboron compounds is presented. Reactions of a wide range of 1,3-dienes with different substitution patterns promoted by an easily accessible phosphine–Cu complex proceed with high yields and
nickel(II) precatalysts for the preparation of 2-substituted 1,3-dienes by a Kumada cross-coupling between vinyl magnesium bromide and vinyl phosphates is described. This is noteworthy as engaging only one vinyl derivative in a transition-metal-catalyzed cross-coupling reaction is already reputedly challenging. Salient features of this method are its operational simplicity, the mild reaction conditions, the