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heat transfer oil bath with magnetic stirring at 110 °C. After 10 h
the tube was removed from the oil bath and allowed to cool to
room temperature. For reactions under microwave irradiation con-
ditions, the tube was deposited in a white Teflon® isolator which
is part of the microwave reactor device. A tube pressure monitoring
sensor was also suited; then time counting started and a continuous
pulse of microwaves at a constant power of 100 W was irradiated
until the mixture of reaction reached 200 °C at which point the
pulse was paused. The pulse was continued when the temperature
had fallen to 197 °C; these cycles were stopped when the desired
time of reactions had been accomplished from the start of the very
first pulse and then the tube was cooled with a flow of air to 50 °C.
This complete irradiation procedure was automated. For both con-
ventional and microwave heating conditions, once the reaction mix-
ture was at room temperature, solids were filtered off and a sample
was diluted with CH2Cl2 (0.5:1.5 mL). Experiments were per-
formed in duplicate and 1 μL of each sample was analyzed by GC–
MS.
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The authors would like to thank Chem. Eng. Luis Velasco Ibarra,
Dr. Francisco Javier Pérez Flores, Q. Eréndira García Ríos, M.Sc.
Lucia del Carmen Márquez Alonso, M.Sc. Lucero Ríos Ruiz,
M.Sc. Alejandra Nuñez Pineda (CCIQS) and Q. María de la Paz
Orta Pérez for technical assistance. The financial support of this
research by the Consejo Nacional de Ciencia y Tecnología (CON-
ACYT) (grant number CB2010-154732) and the Programa de
Apoyo a Proyectos de Investigación e Innovación Tecnológica (PA-
PIIT) (grant numbers IN201711-3 and IN213214-3) is gratefully
acknowledged.
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Received: June 20, 2014
Published Online: August 5, 2014
Eur. J. Inorg. Chem. 2014, 4619–4625
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