Standard & Poor’s lowered Control Data’s senior...

Standard & Poor’s lowered Control Data’s senior debt rating to BB from BB+ . . . Moody’s Investors Service said the long-term debt of United Airlines and the preferred debt of its parent company, UAL Inc., are under review for possible downgrading . . . McDonnell Douglas said it terminated acquisition discussions with Synapse Computer of Milpitas, Calif. . . . MCA, which acquired 63% of LJN Toys in May, filed documents at the SEC seeking permission to make an offer for the remaining shares through an exchange of stock valued at $13.50 per share of LJN.