the equation below the reactions were carried out without the use of any organic solvents the table shows that the reactions could be carried out cleanly and efficiently in the unit it can also be seen that the temperature could be controlled in the range of 55 u00b0 c 65 u00b0 c in the same way p nitro benzyl bromide was synthesized from p nitrotolune reaction temperature continued to rise to ca 90 u00b0 c and then remained almost constant the reaction was continued for 2 5 h and the gc yield on reagent basis was found to be 93 when the same reaction was repeated with operation of the pv powered fan the average temperature of the reaction dropped to 65 u00b0 c as a result of convective heat loss while the gc yield rose to 95 when the rb flask was blackened to prevent exposure of the contents to light the yield observed was only 19 fig6 a shows the spectral profiles along with relative intensities of the global insolation and solar illumination as measured inside the sptr1 the latter was nearly two fold higher fig6 b shows the absorption spectrum of the active brominating agent generated upon addition of a small amount of khso 4 10 20 of stoichiometric requirement into an aqueous solution of 2 1 br u2212 u2014 bro 3 u2212 the shoulder at 392 nm matched well with that of aqueous.