The electrochemical intramolecular cyclisation of bromoalkoxylated derivatives 1 was carried out using Ni(II) complexes as the catalysts in ethanol solutions by constant-current electrolysis in one-compartment cell in the absence of sacrificial anodes as an environmentally friendly system. The reduction of the substrates proceeds via one-electron cleavage of the carbon–bromine bond to form radical-type intermed...
The (1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetra-decane)nickel(I), [Ni(tmc)]+, electrogenerated at glassy carbon cathodes is shown to be an effective catalyst for the intramolecular radical-type cyclisation of bromoalkoxylated derivatives 1 in alcohol and / or alcohol/water mixtures as well as in microemulsions made with cationic and anionic surfactants. The results obtained indicate that the reaction pro...
2009
2007
A produção de embriões somáticos mediante o cultivo de tecidos in vitro, é uma técnica que permite a obtenção de embriões em grande escala, constituindo-se em uma ferramenta importante nos programas de melhoramento genético de algumas culturas. Objetivando-se induzir a formação de calos embriogênicos em algodão a partir da embriogênese somática, germinaram-se, in vitro, sementes da cultivar Coker 312 e, sete di...
2007
2006
2006
2006
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