| http://www.w3.org/ns/prov#value | - In a modification of this process a halothiophene of formula (XVI) in which R1 is a group convertible to R4 R5 NCH2 -- (e.g. an aldehyde grouping protected as an acetal) and the group Hal is at the 3-position may be lithiated and treated with ethylene oxide as described above to give a hydroxyethyl compound of formula (XVIII) ##STR19##
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