1.
J Am Chem Soc
; 134(36): 14662-5, 2012 Sep 12.
Artigo
em Inglês
| MEDLINE
| ID: mdl-22897586
RESUMO
Under H(2), the radical cyclization of appropriate dienes can be catalyzed by cobaloximes. H⢠can be abstracted from an intermediate (presumably a cobalt hydride) by trityl radicals (Ar(3)Câ¢) or by TEMPO. The rate-determining step in these reactions is the uptake of H(2), which is second order in cobalt and first order in hydrogen; the third-order rate constant is 106(3) M(-2)·s(-1).
Assuntos
Cobalto/química , Hidrogênio/química , Compostos Organometálicos/química , Alcadienos/química , Ciclização , Radicais Livres/química
2.
J Am Chem Soc
; 130(13): 4250-2, 2008 Apr 02.
Artigo
em Inglês
| MEDLINE
| ID: mdl-18335937
RESUMO
The V-H bonds in HV(CO)4(P-P) are unusually weak (55 to 58 kcal/mol). They transfer H* to styrene more rapidly than CpCr(CO)3H does and are effective stoichiometric reagents for the cyclization of appropriate 1,6-dienes.
3.
J Am Chem Soc
; 129(4): 770-1, 2007 Jan 31.
Artigo
em Inglês
| MEDLINE
| ID: mdl-17243807