Chromate pentacarbonyl

Pentacarbonyl(methoxymethyl-methylene)chromium, 83 Phosphomolybdic acid-Potassium di-chromate-Copper(II) sulfate, 248 Pyridinium chlorochromate, 237 Pyridinium chlorochromate-Benzo-triazole, 262... 

Cr2HKO oCio, Chromate, (ji-hydrido-bis-[pentacarbonyl-, potassium, 23 27 CsCIsSc, Cesium scandium chloride, 22 23 CsCl7Pr2, Cesium praseodymium chloride, 22 2... 

HCr2KO,oCio, Chromate, i-hydtido-bis[pentacarbonyl-, potassium,... 

FeCrN09P2C45H,i, Chromate(l -)hydrido-nonacarbonyliron-p-nitrido-bis(triphen-ylphosphorus)(l +), 26 338 FeCrN20,P4C HM), Chromate(2-), nona-carbonyliron-, bis[p,-nitrido-bis(tri-phenylphosphorus)( 1 +)], 26 339 FeF6MoO,P2CnH2 , Iron(l + ), p,-acetyl-2K-O I KO-tetracarbonyl-1 K C,2K C-bis-[ 1,2-(Ti -cyclopentadienyl)](triphen-ylphosphine-lKP molybdenum-, hexa-fluorophosphate(] -), 26 241 FeFjMoOftPCivHij, Iron(l + ), p-acetyl-2kC -1 KO-pentacarbonyl-1 k C,2k C-bis[ 1,2-Ti -cyclopentadienyl)]molyb-denum-, hexat uorophosphate(3 26 239... 

NCr07P2C43H33, Chromate(l -), (ace-tato)pentacarbonyl-, p-nitrido-bis(triphenylphosphorus)(l +), 27 297 NF03SC, H36, Fluorosulfate, tetrabutylam-monium, 26 393... 

Pentacarbonyl[l -oxidocyclopropylidene]chromate(0) salts can act as acyl anion equivalents and add to enones to give 1,4-diketones. 

The reaction of 3,3-dichloro-l,2-diphenylcyclopropene (1) with disodium peiitacarbonyl-chromate or disodium pentacarbonylmolybdatc afforded pentacarbonyl(2,3-diphenylcyclo-prop-2-enylidene)chromium (2, M = Cr) or the corresponding molybdenum complex 2 (M = Mo). which reacted with pyridinium ylides to give the 2//-pyran-2-ylidenc complexes 3. The structure of 2 (M = Cr) was determined by X-ray crystallography. ... 

NC1O7P2C4JH33, Chromate(l-X (ace-tato)pentacarbonyl-, (i-nitrido-bis(tri-phenylphosphorus)(l+), 27 291 NF03SC,jH3j, Fluorosulfate, tetrabutyl-ammonium, 26 393 NF5OSC, X -Sulfane, pentafluoro(iso-cyanato)-, 29 38... 

NCrFe09P2C45H3i, Chromate(l—), hydri-dononacarbonyliron-, -nitrido-bis(triphenylphosphorus)(l +), 26 338 NCr03C7H, Chromium, dicarbonyl(r/ -cyclopentadienyl)nitro8yl-, 28 196 NCrOjCjiH, Chromium, tricarbonyl(i -NJV-dimethylbenzenamineK 28 139 NCr09C,oH9, Chromium, (tert-butyl isocyanide)pentacarbonyl-, 28 143 NCrOsCigH,3, Chromium, (benzoyl isocyanide)dicarbonyl(>t -methyl benzoate)-, 26 32... 

Chromium carbenes can also be prepared by the so-called Semmelhack-Hegedus route. Chromium hexacarbonyl is first reduced to a nucleophilic pentacarbonyl dichromate dianion 23 with sodium naphthalenide or potassium carbide. Reaction of this dianion species with an acid chloride gives a metal alkoxide that can be quenched with an electrophile to provide the desired chromate ester 24. Alternatively, the dianion can be added to an amide carbonyl to give a tetrahedral intermediated which collapses to the chromate amide 25 on treatment with trimethylsilyl chloride. 

CrNP2C4jH33, Chromate(l—), (acetato)-pentacarbonyl-, /i-nitrido-bis(triphenyl-phosphorus) (1 +), 27 297 07F IrP2S2C39H3i, Iridium(III), carbonyl-hydridobis(trifluoiomethanesuironato)-bis(triphenylphosphineK 26 120, 28 26 07FePC3H , Iron, tetracarbonyl(trimetbyl phosphiteK 26 61,28 171 07FePCioHi3, Iron, tetracarbonyl(triethyl phosphite)-, 26 61... 

The n-octylaminocarbene complex derived from glucose is synthesized from penta-acetylated gluconic acid chloride 326 addition of potassium pentacarbonyl chromate 251 followed by methylation gives chromium methoxycarbene 327 that undergoes low-temperature aminolysis with u-octylamine and 0-deprotection under basic conditions to afford chromium n-octylaminocarbene 328 (Scheme 11.68) [127]. 

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