Vinyl thianthrenium compound, process for its preparation and its use for transferring a vinyl group

A thianthrene compound of the Formula (I):

• wherein R1 to R8 may be the same or different and are each selected from i) hydrogen, ii) halogen, iii) —OR◯ wherein R◯ is hydrogen or a C1 to C6 alkyl group, which may be substituted by at least one halogen, —NRN1RN2 wherein RN1 and RN2 are the same or different and are each hydrogen or a C1 to C6 alkyl group, which may be substituted by at least one halogen, or iv) a C1 to C6 alkyl group, which may be substituted by at least one halogen, Ci stands for an C-isotope independently selected from 12C or 13C, HD independently stands for hydrogen or deuterium and wherein X− is an anion, selected from F−, Cl−, triflate−, BF4−, SbF6−, PF6−, BAr4−, TsO−, MsO−, ClO4−, 0.5 SO42−, or NO3− with the proviso that the compound of Formula (I) with R1 to R8 being hydrogen, Ci being 12C, HD being hydrogen and X being ClO4− is excluded.