چله НО 12 НО ОН Н H₂/Pd-C Br 1. H/CH₂OH 2.TMSOT!/ Et,N: NBS CH₂O 1. Et,SIOT! 2. CHBr /1-BUOK Br 13 O 10 7/Rh photocat. hv NaHCO, CH₂CN CH₂O Br OEt 11: H'/H₂O O

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Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.