@article{de oliveira_torres_silva_luz_bakuzis_prado_2006,  title={Tetramethylguanidine covalently bonded onto silica gel as catalyst for the addition of nitromethane to cyclopentenone},  volume={17},  ISSN={0103-5053},  url={https://doi.org/10.1590/S0103-50532006000500026},  DOI={10.1590/S0103-50532006000500026},  number={5},  journal={Journal of the Brazilian Chemical Society},  publisher={Sociedade Brasileira de Química},  author={De Oliveira, Edimar and Torres, Jocilene D. and Silva, Carlos C. and Luz, Afrânio A. M. and Bakuzis, Peter and Prado, Alexandre G. S.},  year={2006},  month={Sep},  pages={994–999} }