ROCHA. J.I. An exact sequence related to an extension of rings and a partial representation . 2017. 114 f. Tese (Doutorado) -For a Galois extension of commutative rings, Chase-Harrison-Rosenberg constructed a seven terms exact sequence which involves the Picard group, the relative Brauer group and cohomology groups. The sequence can be viewed as a generalization of two important facts of Galois theory of fields: the Hilbert 90 Theorem and the isomorphism of the relative Brauer group with the second cohomology group. The sequence was generalized by Miyashita for the context of non-commutative unital rings. Later, El Kaoutit and Gomez-Torrencillas extended the result of Miyashita for an extension of non-unital non-commutative rings with local units. The Chase-Harrison-Rosenberg sequence was also considered for partial actions by Dokuchaev, Paques e Pinedo, who constructed a version for a partial Galois extension of commutative rings. In this thesis, we elaborate a vesrion of the sequence in the context of partial actions for an extension of non-commutative unital rings. Our sequence generalizes the sequence given by Miyashita.