1,721,149 research outputs found
Olefin Carbonylation Catalyzed by Palladium from Light Products to High Molecular Weight Polyketone
No full textNew aryldiazo iridium(III) complexes as models in nitrogen fixation reactions producing ammonia and anilinesimultaneously
No full textReaction of trans-IrCl(CO)(PPh3)2 with RC6H4N2.BF4 (R = p-NO2, m-NO2, o-NO2, p-CN, o-CN, p-MeCO) in acetone
gives [(RC6H4N2)IrCl(CO)(PPh3)2].BF4. When R = o-, m-MeCO, starting materials are recovered unreacted. In Cl--
contg. media, (RC6H4N2)IrCl2(CO)(PPh3)2 complexes are formed, even when R is an electron donor. Hydrogenation in
H-satd. C6H6-EtOH or Me2CO did not occur
Mechanistic studies on the selective oxidative carbonylation of MeOH to dimethyl oxalate catalyzed by [Pd(COOMe)n(TsO)2−n(PPh3)2] (n = 0, 1, 2) using p-benzoquinone as a stoichiometric oxidant
No full textThe facile hydrogenation of the aryldiazonium functional group to hydrazine, amine, and ammonia derivatives
No full textAryldiazionium tetrafluoborates react with Rh(PPh3)2Cl(S), and [Rh(PPh3)2H2Cl(S)] under hydrogen, (S = solvent, to yield the same arylazorhodium complexes in both cases, and also hydrazine, amine, and ammonia derivatives in the latter. A discussion of the activation of the NN triple bond of the aryldiazonium cation is presented. © 1972
. Metals in organic syntheses. IV. A novel catalytic carbonylation reaction: the synthesis of arylamides from 1,3-diaryltriazenes in the presence of bistriphenylphosphinedichloropalladium as catalyst precursor
No full textPdCl2(PPh3)2 catalyzes the carbonylation of RNHN:NR (R = Ph, p-MeC6H4, p-FC6H4, p-ClC6H4) to give 50%
RNHCOR. The mechanism is discussed
Simple reduction of the diazonium functional group
No full textAryldiazonium cations react with polyhydrido complexes mer-IrH3(PPh3)3 and RhH2Cl(PPh3)2(S) (S = solvent) to give simple insertion products such as [IrH2(p-HN:NC6H4NO2)(PPh3)3] (BF4) in the former case and hydrazine derivs. in the latter
Metals in organic syntheses. V. The Gattermann-Koch synthesis of aromatic aldehydes promoted by CuCl(PPh3)n(n = 0,1 or 3). Is the cuprous complex necessary in the synthesis of tolualdehyde?
No full textThe use of CuCl(PPh3) in place of CuCl in the Gattermann-Koch synthesis slightly improves the yield of PhCHO but
lowers the yield of tolualdehyde. The poorest yields are obtained in the presence of CuCl(PPh3)3. The formation of
tolualdehyde from toluene and CO in the presence of AlCl3 and HCl is faster in the presence of CuCl, but higher yields
are obtained in its absence and using an excess of hydrocarbon. In competitive expts. carried out using benzene and
toluene together in equimol. amts., only tolualdehyde was formed, supporting the view that an electrophilic substitution is
involved
Processo di preparazione di gamma cheto acidi saturi da gamma-chetoacidi alfa beta insaturi
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