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NiCl2 PPh

A catalyst for the selective cyclodimerization of butadiene to 4-vinylcyclo-hexene can be generated by the reduction of [Fe(NO)2Cl], with metal carbonyls or electrochemically. Addition of cyclic amines to the isoprene dimerization catalyst [NiCl2(PPhs)2]-NaBH4-H20 enhances the formation of cyclic dimers the product distribution has been correlated with an electronic and structural properties of the amine. [Ni P(n-OC6H4R)3 J (R = Ph or SiMes) catalyses the selective (95 %) dimerization of butadirae to cyclo-octa-1,5-diene the catalysts appear to operate via two active centres, probably the Ni and P atoms. When solutions of (44) are allowed to stand and then treated with HCl or Brj signficant amounts of [1,1,3,3- H4]- and [2,2,3,3- H4]-butane are produced in addition to the anticipated [1,1,4,4- H4]-isomer. This would seem to indicate that there is an equilibrium (14) and in keeping with this (44)... [Pg.420]

See other pages where NiCl2 PPh is mentioned: [Pg.491]    [Pg.1375]    [Pg.364]    [Pg.422]    [Pg.748]    [Pg.748]    [Pg.406]    [Pg.424]    [Pg.24]    [Pg.491]    [Pg.1375]    [Pg.364]    [Pg.422]    [Pg.748]    [Pg.748]    [Pg.406]    [Pg.424]    [Pg.24]    [Pg.191]    [Pg.1707]    [Pg.32]    [Pg.81]    [Pg.81]    [Pg.121]    [Pg.1067]    [Pg.557]    [Pg.543]    [Pg.65]    [Pg.1387]    [Pg.70]    [Pg.219]    [Pg.88]    [Pg.430]    [Pg.54]    [Pg.67]    [Pg.94]    [Pg.109]    [Pg.322]    [Pg.185]    [Pg.325]    [Pg.640]    [Pg.417]   
See also in sourсe #XX -- [ Pg.2 , Pg.3 , Pg.134 ]

See also in sourсe #XX -- [ Pg.2 , Pg.3 , Pg.49 ]



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