Cationic Palladium(II), Platinum(II), and Rhodium(I) Complexes as Acetalisation Catalysts
作者:Fabrizio Gorla、Luigi M. Venanzi
DOI:10.1002/hlca.19900730317
日期:1990.5.2
The use of [Pd(H2O)2(Ph2PCH2CH2PPh2)] (CF3SO3)2 as a catalyst for the acetalisation of a variety of aldehydes and ketones and for trans-acetalisation is described. It is also shown that Pt(H2O)2(PH2PCH2CH2PPh2) (CF3SO3)2 is at least as effective as the corresponding Pd compound, while much lower reaction rates are observed with [Rh(MeOH)2(Ph2PCH2CH2PPh2)] [BF4].
Phosphite‐Catalyzed C−H Allylation of Azaarenes via an Enantioselective [2,3]‐Aza‐Wittig Rearrangement
作者:Abdul Motaleb、Soniya Rani、Tamal Das、Rajesh G. Gonnade、Pradip Maity
DOI:10.1002/anie.201906681
日期:2019.10
A phosphite-mediated [2,3]-aza-Wittig rearrangement has been developed for the regio- and enantioselective allylic alkylation of six-membered heteroaromatic compounds (azaarenes). The nucleophilic phosphite adducts of N-allyl salts undergo a stereoselective base-mediated aza-Wittig rearrangement and dissociation of the chiral phosphite for overall C-H functionalization of azaarenes. This method provides
Acetalization and Transacetalization Reactions Catalyzed by Ruthenium, Rhodium, and Iridium Complexes with {2-{{Bis[3-(trifluoromethyl)phenyl]phosphino}methyl}-2-methylpropane- 1,3-diyl}bis[bis[3-(trifluoromethyl)phenyl]phosphine] (MeC[CH2P(m-CF3C6H4)2]3)
The complexes [RhCl(3−n)(MeCN)n(CF3triphos)](CF3SO3)n (n=1, 2; CF3triphos=MeC[CH2P(m-CF3C6H4)2]3) and [M(MeCN)3 (CF3triphos)](CF3SO3)n (M=Ru, n=2; M=Ir, n=3) are catalyst precursors for some typical acetalization and transacetalization reactions. The activity of these complexes is higher than those of the corresponding species containing the parent ligand MeC[CH2P(C6H5)2]3(Htriphos). Also the complexes