CpCo

Further expansion of 13-vertex species or thermal metal transfer reactions leads to the 14-vertex cluster [(T -C H )Co]2C2B2qH22 [52649-56-6] and [52649-57-7] (199). Similar 14-vertex species have been obtained from tetracarbaboranes (203) and show unusual stmctures. The isomeric bimetallic cobaltacarborane complexes /(9j (9-(Tj -CpCo)2C2BgH2Q (cp = C H ) can be formed by either polyhedral expansion or contraction reactions. Six isomers of this cluster are formed in the thermally-induced intermolecular metal transfer and polyhedral expansion of the 11-vertex f/oj o-(ri -C H )CoC2BgH Q. [Pg.247]

Cobalt complex 83 was obtained by the reaction of [CpCo(SMe2)3l2(BF4)2 with pentamethylpyrrole [88AG(E)579]. Full cobalt sandwich of 2,5-di-terr-butyl-pyrrole is also known [91JCS(CC)1368]. Meanwhile, attempts to synthesize other pyrrolyl complexes of cobalt, (Ti -2,5-dimethylpyrrole)cobalttricarbonyl and the 3,4-dimethyl analog, have been unsuccessful [87JOM(330)231]. [Pg.131]

Scheme 3. CpCo(CO)2-catalyzed cyclotrimerization of 7 with 8, and subsequent reactions of benzo-cyclobutene 9.

With respect to reaction mechanism, it is likely that CpCo(CO)2-mediated alkyne cyclotrimerizations proceed through discrete orga-nometallic intermediates and are therefore not concerted.12 A plausible mechanistic pathway for the CpCo(CO)2-catalyzed cyclotri-... [Pg.156]

Solutions of T7 -CpCo(CO)2, and (T -Me5C5)RhCl2 together with (rj -Cp)2Co as reductant in CH2CI2, are employed as starting materials for the diborine complexes XII and XIII. Complex XIV results from the reaction of Fe(CO>5 and the diborine in toluene by irradation . [Pg.72]

The five-membered heterocycle Et2C2B2Mc2S reacts with 17 -CpM fragments (M = Ni, Co) from [Tj -CpNi(CO)2]2 and i) -CpCo(CO)2 to form mixed sandwich complexes of the type rj -CpM(Et2C2B2MeS) , whereas Ni(CO>4 yields the bis(di-hydrothiadiborol) complex. The (Et2C2B2Me2S)Ni(CO)2 is formed in the first step. [Pg.73]

Neutral 2,3-dihydro-1,3-diboroles is also present in the sandwich complex tj -CpCo(Et2C2B2R2CHR ) ... [Pg.76]

Both T)5-CpCo(Me2C2B2Me2CH2) and r -CpRh(Et2C2B2Et2CHMe) have been used to synthesize special 2,3-dihydro-1,3-diborole sandwich compounds. Via the anions [i7 -CpM(R2C2B2R 2CR")] , available by reduction with K, the AuPPhj derivatives are obtained ... [Pg.77]

The 17 -CpCo and Fe(CO>3 fragments from 7j -CpCo(C2H4)2 and Fe2(CO) respectively, give dihydroazasilaborole complexes, too ... [Pg.79]

Dihydro-lH-l,2-azaboroles react with j7 -CpCo(C2H4)2 at —78°C giving mixed Tj -cyclopentadienyl-T7 -dihydroazaborole complexes with an 18-electron configuration ... [Pg.80]

Vapor-phase reaction of 2,4-C2B5H7 with 7 -CpCo(CO)2 yields l,8-(7j -Cp)2-... [Pg.83]

Two cobaltoboranes are produced using the hot-cold reaction technique. Starting with T7 -CpCo(CO)2 and B5H9, l-tj -Cp-l-CoBjH, (3.9%) and 2-i7 -Cp-2-CoB9Hj3 (2.5%) can be isolated in addition to a number of uncharacterized products. . ... [Pg.83]

As by-products triple- and tetradecked complexes are obtained Tj -CpCo-/i-(Et2C2-B2Me2CH)CoCp-Tj , 7 -CpCo-jU.-(Et2C2B2Me2CH)M-/A-(Et2C2B2Me2CH)-CoCp-Tj (M = Co, Ni). A second route to the hexadecked complex uses Tj -C3H5Ni-/j,-(Et2C2B2Me2CH)CoCp-r) and (Et2C2B2Mc2CH2)2Ni. [Pg.88]

A mixed Co-Ni oligodecked complex is available by reacting tj -CpCo-(EtsCjBjEtjCHMe) with Ni(CO)4 ... [Pg.90]

See also in sourсe #XX -- [ Pg.2 , Pg.167 ]

See also in sourсe #XX -- [ Pg.195 ]

See also in sourсe #XX -- [ Pg.2 , Pg.370 , Pg.405 ]

See also in sourсe #XX -- [ Pg.2 , Pg.11 , Pg.11 , Pg.11 , Pg.11 , Pg.11 , Pg.11 , Pg.14 , Pg.15 , Pg.16 , Pg.22 , Pg.23 , Pg.24 ]

See also in sourсe #XX -- [ Pg.2 , Pg.549 , Pg.550 , Pg.551 ]

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