Boston’s 400-lawyer powerhouse Goodwin, Procter & Hoar is on the verge of picking up a chunk of Roseland, N.J.’s Friedman Siegelbaum, which will prompt its dissolution, according to sources familiar with the deal.

Name partner Joseph Siegelbaum spent last Thursday at the offices of the prospective acquirer, Goodwin, Procter & Hoar, these sources say.