Tris chromium tricarbonyl

Tris(acetonitrile)chromium tricarbonyl Chromium, tris(acetonitri)e)tricarbonyl- (8,9) (16800-46-7)... 

A number of substituted benzenes, naphthalenes, indans, pyridmes, and indoles form arene(tricarbonyl)chromium complexes upon thermolysis under an inert atmosphere, usually in a high boiling ether, or by irradiation of the arenes in the presence of chromium hexacarbonyl. The complexes are relatively air-stable and can usually be stored for long periods in the absence of light. Somewhat milder conditions can be used by transfer of the chromium tricarbonyl group from preformed naphthalene(tricarbonyl)chromium, tris(L)tricarbonyl chromium (L = acetonitrile, ammonia, pyridine), or tricarbonyl( -l-methylpyrrole)chromium. Enan-tiomerically pure arene(tricarbonyl)chromium complexes having two different substituents, either ortho or meta can be prepared conveniently by classical resolution of racemic... 

PHENYLATION n-Benzenechromium tricarbonyl. if(Chlorobenzene)chromium tri-carbonyl. 

N3Cr03C.2H,5, Chromium, tricarbonyl-tris(propionitrileK 28 32 N3Ci03C gH2, Chromium, tris(tert-butyl isocyanide)tricaibonyl-,yhc-, 28 143 N3Fe02Cj,H27, lron(0), dicaibonyltris(2-isocyano-13-dimethylbenzene)-, 26 56, 28 182... 

N3Cr03C,gH27, Chromium, tris(tert-butyl isocyanide)tricarbony 1-, /ac-, 28 143 N3Fc02C29H27, Iron, dicarbonyltris(2-isocyano-l,3-dimethylbenzene)-, 26 S6 N3Mo03Ci,H27, Molytxlenum, tris(tert-butyl isocyanide)tricarbonyl-,/ac-,... 

CrNC7H], Chromium, dicarbonyRi -cyclopentadienyl)nitrosyl-, 28 196 OjCrNCiiH, , Chromium, tricarbonyl(i -lV,iV-dimethylbenzenamine)-, 28 139 0]CtN3C22Hij, Chromium, tricaibonyltris-(propionitrile)-, 28 32 0]CrN3CigH27, Chromium, tris(tert-... 

An interesting picture was revealed by Gouverd et al. (2006) as a result of comparison between the neutral chromium tricarbonyl complex of C,P-diaryl phosphaalkene [(CO)3Cr<—PhCH=PMes ] and its anion-radical [(CO)3Cr <— PhCH=PMes ] (Mes is 2,4,6-tris(tert-butyl)phenyl). According to the ESR and DFT data for the anion-radical, about 40% of the negative charge is localized on Cr(CO)3 moiety. This is understandable if one takes into account the known electron-acceptor... 

N3CrF909S3Ci2H2i, Chromium(lll), (N,N, N"-trimethyl-1,4,7-triazacyclononane)tris(tri-fluoromethanesulfonato)-, 34 152 N3M0O3C18H15, Molybdenum(0), tricarbonyl-... 

WarningI Tris(acetonitrile)chromium tricarbonyl is highly pyrophoric and degrades rapidly when exposed to oxygen, but is reasonably stable in THF solution. Best yields are obtained when this intermediate is as free of acetonitrile as possible while avoiding formation of the green colored [Cr(lll)] decomposition product, which develops on contact with air. 

The reaction is monitored by TLC (silica gel, 6 1 hexanes ethyl acetate). Typical characteristics are Rf- 0.15, a yellow spot [tris(acetonitrile)chromium tricarbonyl intermediate], and Rf = 0.51, a red spot (product complex). Total reaction time averaged 180 hr. 

Pentacarbonyl(methoxymethyl-methylene)chromium, 83 Tri-p,-carbonylhexacarbonyldiiron, 320 Tricarbonyl(methyl benzoate)chromium, 19... 

A chromium tricarbonyl-tellurophene complex was obtained from tellurophene and tris[acetonitrile]chromium tricarbonyl4. 

Richard followed the course of the reactions of Cr(CO)6 and Mo(CO)6 with hexamethylborazine by UV-vis spectroscopy but although he observed that the intensity of the absorption maximum of the hexacarbonyls at around 290 nm decreased and a new band at around 350 nm appeared, he was unable to identify the new product. Experiments with other starting materials such as norborna-diene chromium and molybdenum tetracarbonyl or tris(aniline) molybdenum tricarbonyl which readily react with arenes by ligand exchange, also failed. The key to success was to use tris(acetonitrile) chromium tricarbonyl as the precursor, which in dioxan under reduced pressure afforded the desired hexamethylborazine chromium tricarbonyl as a stable crystalline solid in 90% yield. This was the breakthrough and, after we had communicated the synthesis and spectroscopic data of the complex in the January issue 1967 of Angewandte Chemie, Richard finished his work and defended his Ph.D. thesis in June 1967. Six months before, in December 1966,1 defended my Habilitation thesis in front of the faculty and became Privatdozent (lecturer) on the 1st of January 1967. 

The synthesis of tricarbonylchromium(O) complexes of mono-, di- and tri-substituted cyclopropanes, e.g. 150, has been accomplished through the reaction of tricarbonyl(styrene) chromium(O) complexes 151 with phosphorus and sulfur ylides. ... 

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