Rhodium chlorotris

Halpern J, Okamoto T and Zakhariev A 1976 Mechanism of the chlorotris(triphenylphosphine)rhodium(l)-catalyzed hydrogenation of alkenes J. Mol. Catal. 2 65-9... [Pg.2713]

Chlorotris(triphenylphosphine)rhodium(I) its chemical and catalytic reactions. F. H. Jardine, Prog. Inorg. Chem., 1981, 28, 63-202 (650). [Pg.31]

Aldehydes, both aliphatic and aromatic, can be decarbonylated by heating with chlorotris(triphenylphosphine)rhodium or other catalysts such as palladium. The compound RhCl(Ph3P)3 is often called Wilkinson s catalyst.In an older reaction, aliphatic (but not aromatic) aldehydes are decarbonylated by heating with di-tert-peroxide or other peroxides, usually in a solution containing a hydrogen donor, such as a thiol. The reaction has also been initiated with light, and thermally (without an initiator) by heating at 500°C. [Pg.944]

Acyl chlorides containing an a hydrogen are smoothly converted to alkenes, with loss of HCI and CO, on heating with chlorotris(triphenylphosphine)rhodium, with metallic platinum, or with certain other catalysts. The mechanism probably involves conversion of RCH2CH2COCI to RCH2CH2—RhCO(Ph3P)2Cl2 followed by a concerted syn elimination of Rh and H. See also 14-39 and 19-12. [Pg.1339]

The diester 226 undergoes ring-closure to the methylenecyclopentane derivative 227 in the presence of a catalytic amount of chlorotris(triphenylphosphine)rhodium in boiling chloroform saturated with hydrogen chloride. In contrast, if the reaction is catalysed by palladium(II) acetate, the isomeric cyclopentene 228 is produced (equation 115)118. [Pg.540]

Chlorotris(dialkylamino) titanates, 25 100 Chlorotris(triphenylphosphine)rhodium(I), 7 591, 593... [Pg.180]

Bis(phenylethynyl)-2,2 -bithiophene derivatives function as 1,6-diyne synthons for benzodithiophenes <1997HCA111>. Hence, treatment of 164 with chlorotris(triphenylphosphine)rhodium(l) provides an unstable... [Pg.1169]

Braun reaction, 0-73). In a similar reaction, treatment of N-alkyl-substituted amides with chlorotris(triphenylphosphine)rhodium RhCl(PPh3)3 or certain other catalysts give nitriles and the corresponding alcohols.419... [Pg.1042]

AMINES Chlorotris(triphenylphosphine)-rhodium(I). l,4-Dichloro-I,l,4,4-tetra-methyldisilethylene. [Pg.470]

Method B. In a Schlenk tube 100 mg (0.11 mmol) of chlorotris(triphenyl-phosphine)rhodium(I), ClRh[P(C6H5)3]3, is dissolved in a mixture of 20 mL of toluene and 10 mL of tetrahydrofuran. Then 20 mL of an aqueous solution of 1.87 g (3.3 mmol) of tppts is added to this solution to form a lower layer. After 12 h of vigorous stirring, the reaction mixture is transferred to a separation funnel. The aqueous phase is separated and washed twice, in each case with 5 mL of methylene chloride. The organic phases are discarded. The pure compound is obtained by column chromatography of the water phase on Sephadex G-15. Yield 180 mg (82%). [Pg.21]

Tihe decarbonylation reaction utilizing chlorotris (triphenylphosphine)-- rhodium(I) is a potentially useful method for converting acid chlorides to olefins or alkyl chlorides. Acid chlorides which contain a f3 hydrogen produce olefins (Reaction 1) while an alkyl chloride is the product when no / hydrogen is present (J, 2, 3, 4, 5, 6) (Reaction 2). [Pg.190]

The mechanism that has been proposed for the decarbonylation of acid chlorides by chlorotris (triphenylphosphine) rhodium (I) involves acyl- and alkyl- or arylrhodium complexes (2). Three of the intermediates in the catalytic cycle, II, III, and IV (see Reaction 3), can be isolated in this unique reaction. Both acyl complexes (II) and alkyl... [Pg.190]

In an attempt to resolve this question of stereochemistry and also to determine whether or not the decarbonylation of an acid chloride containing a f3 hydrogen takes place stereospecifically, erythro- (XI) and fhreo-2,3-diphenylbutanoyl chlorides (XII), obtained by the reaction of the known acids (13, 14) with oxalyl chloride, were synthesized. The reaction of these acid chlorides (see Reaction 8) with chlorotris( triphenyl-phosphine) rhodium gave the corresponding acyl complexes of type lib [R = C6H5CH(CH3)CH(C6H5)]. Decarbonylation of the erythro- cy complex in benzene at 30 °C gave a 90% yield of frans-a-methylstilbene while decarbonylation of the threo-acyl complex under similar reaction... [Pg.196]

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