Shell Internationale Research Maatschappij, B.v.

John M Barker

Patrick Robinson Huddleston

A compound of the general formula ##STR1## in which X represents a chlorine or bromine atom, R.sup.1 represents a hydrogen atom, a C(1-6) alkyl group, a benzyl group or a phenyl group optionally substituted by a C(1-6) alkyl group, and R.sup.2 represents the group CN or the group COOR.sup.3 in which R.sup.3 represents a C(1-6) alkyl group, a process for the preparation of a compound of formula (I), and the use of a compound of formula (I) in the preparation of a compound of the general formula. ##STR2## in which R.sup.1 is as defined above and R.sup.4 represents an amino group or a hydroxyl group.

Thiapentanamide derivatives

A process for the preparation of 3-aminothiophenes or acid-addition salts thereof, which comprises reacting the corresponding 3-oxotetrahydrothiophenes with an acid-addition salt of hydroxylamine in the presence of a polar inert solvent and in the absence of a base at a temperature in the range of from 0.degree. to 200.degree. C.

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Nottingham, United Kingdom

John M Barker