The microwave mediated distillation apparatus were made according
to Lloyd and Grimm (1999). The microwave oven used was
a CEM (Matthews, NC, USA) Model 300. The distillationwas done at
microwave power of 350 W for 10 min; the flow rate of N2 was
80 mL/min. The liquid distillate was collected in a 10 mL glass vial.