1,2-Diaminocyclohexane, cobalt

Schaffer and his collaborators examined the tris[(+)-trans-1,2-diaminocyclohexane]cobalt(III) system (22). Equilibrium between the isomers was established by the presence of charcoal as catalyst at 393K. The equilibrium mixture was separated by column chromatography on a Sephadex ion exchange column and the formation ratios were determined. On the other hand, equilibrium geometries of the four conformers, lei, lel-ob, lelot>2 and ob, were calculated by Boyd s procedure (29, 307. The strain energies are shown in Table IV. The values do not differ very much from those for... 

Cl 8Hi,8N90i 2Rh, ( + )-Tris-( (-)-trans-l, 2-diaminocyclohexane)rhodium-(III) nitrate trihydrate, 40B, 903 Cl8H52CI3C0N6O5, (-)589"Tris(+trans-1,2-diaminocyclohexane)cobalt-(III) chloride pentahydrate, 35B, 713 Cl8H52CI3C0N6O5, Bis((S,S)-trans-1,2-diaminocyclohexane)-(R,R)-trans-1,2-diaminocyclohexanecobaltdII) chloride pentahydrate, 43B, 1151... 

The circular dichroism spectral rhita for the rlextroroiatory cnattlioiner of aislR.K-rraiis-U-diaminocyclohexane)cobalt(llll cation. (+ [CaMf,/f-chxnl, . if listed in Tabic I2J. would appear as follows ... 

Enantiomer-differentiating co-polymerization of terminal epoxides is achieved by chiral chromium and cobalt complexes. Jacobsen etal. reported the co-polymerization of 1-hexene oxide with GO2 by using complex 35a. The reaction proceeds with kinetic resolution at 90% conversion, the unreacted epoxide is found to be enriched in the (i )-enantiomer of 90% ee. Detailed information about the resultant polymer, however, is not described. As discussed in the previous section, chiral cobalt-salen complex 34c co-polymerizes PO and GO2 (Table 3). When 34c with /r<3 / j--(li ,2i )-diaminocyclohexane backbone is applied to the co-polymerization, (A)-PO is consumed preferentially over (i )-enantiomer with a of 2.8 to give optically active PPG (Equation (8)). In a similar manner, a binary catalyst system, 34d/Bu4NGl, preferentially consumes (A)-PO over R)-PO with = 2.8-3.5. ... 

The X-ray analysis of the complexes (-)5g9-bis[(s,s-trans-l,2-diaminocyclohexane)]-(R,R)-trans-l,2-diaminocyclohexaneo)balt(ni) chloride pentahydrate, (—)s89-(.lel2,ob)-[Co(chxn)3]Cl3 5H20 and (-)5g9-bis[(lR,2R)-l,2-diaminocyclohexane](3,3 -dimethyl-2,2 -bipyTidyl)cobalt(in) bromide diperchlorate monohydrate, (-)58 -[Co(R,R-chxn)2(3,3 -dmbpy)]Br(C104)2 shows that in both cases the molecules... 

Bis-salicylidene (or bis-salen) derivatives of 1,2-diaminocyclo-hexane are prepared by treatment of the diamine (or its tartrate salt) with an o-hydroxybenzaldehyde derivative and are used for asymmetric manganese-, cobalt- or chromium-catalyzed reactions. The most important ligand of this type is A(A -bis(3,5-di-terf-butylsalicylidene)-diaminocyclohexane (12), the detailed synthesis of which has been published. Another important ligand is the atropoisomeric derivative (13) (eq 21). ... 

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