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- W2078422585 abstract "Abstract The compounds (CO) 5 CrEPhH 2 (E P, II ; E As, VIII ) react with RP(CCH) 2 (R t Bu, Ia ; R CH 2 Ph, Ib ) and Me 2 Sn(CCPh)2 ( V ) via insertion into the EH bonds to give 1,4-dihetero-cyclohexa-2,5-diene complexes of the type [(CO) 5 Cr](Ph) PCHCHXCHC H (X RP, III ; X PhAs, IX ) and [(CO) 5 Cr](Ph)PC(Ph)CHSnMe 2 CHC (Ph) ( VII ) in high yields. The insertion of the dialkynes is stereospecific: trans addition of II to V yields first [(CO) 5 Cr](Ph)(H)PC(Ph)CHSnMe 2 C CPh ( VI ) a compound in which the phosphorus group and the Me 2 Sn(CCPh) unit are in cis position to each other. Ring closure by insertion of the second phenylethynyl group in VI into the PH bond affords the six membered cycle of [(CO) 5 Cr](Ph) P C(Ph)CHSnMe 2 CHC (Ph) ( VII ). Another way to synthesize complexes of the type VII is given in the reaction of I with H 2 Sn n Bu 2 ( XIII ). In the presence of KOH/18-Crown-6, the cycles of R PCHCHSn n Bu 2 CHC H (R t Bu, XIVa ; R CH 2 Ph, XIVb ) are formed, which then yields by treatment with (CO) 5 Cr(Thf) ( XV ), [(CO) 5 Cr](R) PCHCHSn n Bu 2 CHC H (R t Bu, XVIa ; R CH 2 Ph, XVIb ). A compound, in which both hetero-atoms of the 1-phospha-4-arsacyclohexa-2,5-diene ( IXa ) are bonded to a 16-electron complex fragment can be synthesized by the reaction of IXa with (CO) 5 Mo(Thf) ( X ). [(CO) 5 Cr]( t Bu) P CHCHAs(Ph)[Mo(CO) 5 ]CHC H ( XII ) can be isolated in high yields. The identity of all new synthesized compounds III, VI, VII, IX, XII, XIV and XVI is confirmed by analytical and spectroscopic (IR, MS, 1 H, 13 C and 31 P NMR) data as well as by an X-ray diffraction study of IXa ." @default.
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- W2078422585 date "1993-02-01" @default.
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- W2078422585 title "Additionsreaktionen von (CO)5CrEPhH2(E P As) an di(ethinyl)-phosphane und stannane; stufenweise darstellung von komplex-gebundenen 1,4-dihetero-cyclohexa-2,5-dienen" @default.
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- W2078422585 doi "https://doi.org/10.1016/0022-328x(93)83054-y" @default.
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