Rhodium dicarbonyl chloride

Rhodium dicarbonyl chloride dimer Double ring opening by isomerization... 

A soln. of tricyclo[4.1.0.02.7]heptane in acetonitrile treated 15 min. at room temp, with 4 mole-% rhodium dicarbonyl chloride dimer -> 3-methylenecyclohexene. Y 98%. P. G. Gassman and T. J. Atkins, Am. Soc. 93, 1042 (1971) f. e., also with iridium tricarbonyl chloride dimer, s. ibid. 95,1812 1,3-dienes from bicyclobutanes with Ag-perchlorate s. M. Sakai et al., ibid. 93, 1043. 

Y-Ray analysis has revealed the structure of an intermediate (366) in the oligomerization of allene by nickel complexes which contains three allene units and is assumed to be formed by the series of steps in Scheme Using rhodium dicarbonyl chloride dimer and triphenylphosphine in ethanol, an allene hexamer has been isolated for which structure (367) is proposed. 2... 

Filter paper impregnated with dicarbonyl(benz-2,l,3-thiadiazole)rhodium chloride gives characteristic colorations with the aminophenol isomers after fixation and can be used as an indicator paper (99). 

The carbonyl chloride is an excellent source of other rhodium(I) species, and the halogen bridges are readily cleaved by a wide variety of donor ligands to give ds-dicarbonyl complexes ... 

Dicarbonyl(phenanthrolme 7-oxide)rhodium(l) perchlorate, 3626 Dicarbonylpyrazinerhodium(l) perchlorate, 2147 Dicarbonyl-z/-trichloropropenyldinickel chloride dimer, 3233 Dicarbonyltungsten diazide, 1013... 

Bis(dicarbonyl)dichlorodirhodium, [Rh(CO)2Cl]2, is most easily obtained by passing CO saturated with ethanol over RhCl3-3H20 at ca. 100°, when it sublimes as red needles. It has the structure shown in Fig. 26-G-2, where the coordination around each Rh atom is planar, and there are bridging chlorides with a marked dihedral angle, along the CI-CI line. There appears to be some direct interaction between electrons in rhodium orbitals perpendicular to the planes of coordination. In rhodium and iridium /3-diketonates such as Rh(CO)2(acac) and in Ir(CO)2(8-quinolinolate), there is distinct metal—metal interaction in the lattice, leading to semi-conductor behaviour.3... 

This carbonyl chloride is a useful source of other rhodium(t) species and it is readily cleaved by donor ligands to give cis-dicarbonyl complexes, e.g.,... 

An interesting series of dicarbonyl complexes of rhodium(I) containing singly charged bidentate ligands like cupferron has been synthesized by three different routes, i.e. (i) from tetracarbonyl- i,/i -dichlorodirhodium(I), (ii) from solutions of rhodium chloride in DMF under reflux and (iii) from a carbonylated solution of rhodium chloride in boiling absolute alcohol. These dicarbonyls react with PPhj, AsPhj and SbPhj to yield monocarbonyl derivatives. 

C2oH32Cl2N20i,Rh2, cis-Dicarbonyl-glyoxal-bis(2,4-dimethylpentyl-3-imine)rhodium(I) cis-dicarbonyl-dichlororhodate(I), 46B, 1097 C20H32CI2N12O1uPt 7 H2O, cis-Diamminebis(guanosine)platinum(II) chloride perchlorate heptahydrate, 46B, 1098 C20H32CI4CU2N20O6, Dichlorotetra-M adenine-dicopper(II) chloride hexahydrate, 37B, 552... 

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