Novel functionalized 1,3-dialkylimidazolinium (LH) salts as precursors for N-heterocycliccarbenes (NHCs) have been prepared and successfully applied in the palladium-catalyzed synthesis of diaryl ethers and arylation ofbenzaldehydes. An efficient catalyst system was prepared in situ from Pd(OAc) 2 , 1,3-dialkylimidazolinium bromides (LHBr), and NaH.
Palladium-Catalyzed Heck Reaction of Aryl Bromides in Aqueous Media Using Tris(N<i>-</i>Heterocyclic Carbene) Ligands
作者:Ismail Özdemir、Serpil Demir、Bekir Çetinkaya
DOI:10.1055/s-2007-973860
日期:2007.4
highly effective, easy to handle and environmentally benign process for palladium-mediated Heckreaction was developed. The in situ prepared three-component system composed of palladium(II) acetate, a tris(azolinium) bromide and potassium TERT-butoxide, quantitatively catalyzes the Heckreaction of arylbromides in aqueous media.
Amidate compound, catalyst for polyurethane production, and method for producing polyurethane resin
申请人:KOEI CHEMICAL COMPANY, LIMITED
公开号:US10689478B2
公开(公告)日:2020-06-23
Provided is an amidate compound represented by the formula (1):
wherein A is a substituted or unsubstituted hydrocarbon group, n is an integer of 1 or more, and D is a nitrogen-containing organic group represented by the formula (2):
wherein R1, R2, and R3 are the same or different, and are each a hydrocarbon group that may contain a heteroatom; some or all of R1, R2, and R3 may be bonded together to form a ring structure; X is a nitrogen atom, an oxygen atom, or a sulfur atom; and a is 0 or 1, wherein a is 1 when X is a nitrogen atom, and a is 0 when X is an oxygen atom or a sulfur atom.
Tetrahydrofolate coenzyme models: Imidazolines as nucleophilic C1-transfer reagents
作者:Raymond C.F. Jones、John R. Nichols
DOI:10.1016/s0040-4039(00)88876-0
日期:1990.1
1-Benzyl-2-imidazoline is deprotonated at C-2 and alkylated by a sulphenylation-substitution sequence (to complete a formal C1-transfer), whereas arylation occurs by an unusual sulphenylafion-sulphide contraction pathway