Organocobaloximes: synthesis, oxygen insertion and kinetics
作者:B.D. Gupta、V.Vijai Kanth、Veena Singh
DOI:10.1016/s0022-328x(98)00809-2
日期:1998.11
dpgH. Many of the chgH and all the dpgH complexes have been synthesised for the first time. The insertion of molecularoxygen into these organocobaloximes, RCoIII(L2)B [L=dmgH, chgH and dpgH) under thermal and photochemical conditions have been studied. Kinetic studies at ambienttemperature under irradiation show that the rate of insertion depends upon the nature of R, L, B and the solvent. The rate
CoC bond cleavage in the reactions of alkyl, benzyl and heteroaromaticmethyl cobaloximes with arene sulfenyl chloride: Homolytic and heterolytic pathways
作者:B.D Gupta、Vandana Dixit、Indira Das
DOI:10.1016/s0022-328x(98)00689-5
日期:1999.1
The reactions of arene sulfenyl chlorides, ArSCl, (Ar=Ph, C6Cl5, 2,4 (NO2)2C6H3) with organocobaloximes, RCo(dmgH)2Py, (R=alkyl, benzyl and heteroaromaticmethyl) were carried out under thermal and photochemical conditions. A variety of organic and organometallic products are formed depending upon the substrate cobaloxime. For 3-methoxybenzyl and heteroaromaticmethyl cobaloximes the results suggest
Sulphur dioxide insertion into organocobaloximes: a true insertion or a case of radical chain process?
作者:B.D. Gupta、Maheswar Roy、Moni Oberoi、Vandana Dixit
DOI:10.1016/0022-328x(92)86007-q
日期:1992.6
Sulphurdioxide gas readily inserts into the CoC bond of organocobaloximes under photochemical conditions at 0°C, but there is no insertion under thermal conditions. The reactions are not true insertions into the CoC bond but proceed by a free radical chain process in which the organic and the metal fragment of the inserted product come from different organometallic substrates.
Synthesis of organocobaloximes: Modification of the organic group in organocobaloximes
作者:B.D. Gupta、Vandana Dixit
DOI:10.1016/s0022-328x(96)06837-4
日期:1997.4
5-Substituted heteroaromaticmethyl cobaloximes are synthesized by a very simple reaction of arenesulfenyl chloride, ArSCI (Ar = Ph, C6Cl5 and 2,4-(NO2)(2)C6H3) with heteroaromaticmethyl cobaloximes, RCoIII(dmgH)(2)Py [R = 2- and 3-thienylmethyl, furfuryl] in the dark at 0 degrees C. As organocobaloximes are susceptible to Co-C bond cleavage by the electrophiles and free radicals, the ring substitution is quite remarkable.