Fleet Financial Group said Monday that sales of deposits and assets in connection with its proposed acquisition of BankBoston Corp. should yield a gain of $700 million to $1.2 billion.

As part of the $16 billion merger deal, announced last month, the two banking companies agreed to divest $13 billion of deposits and $5 billion of assets. Most of the divestitures would come in overlapping markets in Massachusetts, Connecticut, and Rhode Island. The deal is expected to close in the fourth quarter, pending regulatory approval.

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