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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/3749

Title: Chemical modification of the metal-carbene appendage in new, trimetallic adducts of Fe-2(CO)(6)(mu-EE') (E = S, Se and E' = Se, Te) and alkynyl Fischer carbene complexes (CO)(5)M=C(OEt)(C CPh) (M = Cr, W)
Authors: MATHUR, P
GHOSH, S
SARKAR, A
SATYANARAYANA, CVV
PURANIK, VG
Keywords: spectroscopic characterization
structural characterization
crystal-structure
chemistry
stereochemistry
ligands
bond
Issue Date: 1997
Publisher: AMER CHEMICAL SOC
Citation: ORGANOMETALLICS, 16(20), 4392-4398
Abstract: From the room temperature reaction of the transition metal alkynyl Fischer carbene complexes (CO)(5)M=C(OEt)(C=Ph) (M = Cr, W) with the homochalcogenide compounds Fe-2(CO)(6)(mu-E-2) (E = S, Se, Te), the following new trimetallic adducts were obtained: [(CO)(6)Fe2E2{mu-PhC=CC(OEt)}M(CO)(5)] (1-5; 1, 30%, E = S, M = Cr; 2, 85%, E = Se, M = Cr; 3, 85%, E = Se, M = W; 4, 28%, E = Te, M = Cr; 5, 25%, E = Te, M = W). Alkoxy groups are readily replaced by amino groups in adducts 2, 3, and 5 at room temperature as syn-and anti-isomers, [(CO)(6)Fe2E2{mu-PhC=CCN(H)R}M(CO)(5)] (syn-8a-f and anti-8a-f; where R = CH3, CH2Ph, CH2CH=CH2), in 70-90% yield. When a methanolic solution of [(CO)(6)Fe2EE'{mu-PhC=CC(OEt)}M(CO)(5)] (E not equal E', E = S, Se; E' = Se, Te; M = Cr, W) was stirred at room temperature for 1-2 days, the ester and ortho ester derivatives (CO)(6)Fe-2{mu-EC(PH)=C(CO)(OR)E'} (12-15) and (CO)(6)Fe-2{mu-EC(Ph)=CC(OR)(OMe)(2)E'} (16-19) (R = CH3, C2H5) were formed, All compounds were characterized by IR and H-1, C-13, Se-77, and Te-125 NMR spectroscopies. Crystallographic analysis of the compound Fe-2(CO)(6){mu-SC-(Ph)=CC(OCH3)(2)(OC2H5)Te} (17) established its structure as a Fe2STe tetrahedral butterfly core containing the ortho ester unit, C(Ph)=C-C(OCH3)(2)(OC2H5)} as a bridge between the two wing-tip chalcogens.
URI: http://dx.doi.org/10.1021/om970356s
http://dspace.library.iitb.ac.in/xmlui/handle/10054/3749
http://hdl.handle.net/10054/3749
ISSN: 0276-7333
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