The two isomers 1and 3-methylbenzo[b]naphtho[2,1-d]thiophene (1and 3-Me-2,1BNT) are known alkyl thiaarenes belonging to the group of semi-polar PAH (heterocyclic or NSO-PAH). In particular, 1-Me-2,1-BNT is currently atracting much attention because it is one of the 15 priority substances, for which in Europe a need for regulatory steps under REACH regulation is potentially demanded (Schwarz et ...