CONVERGENT TECHNOLOGIES <CVGT> TO BUY OAKLEAF Convergent Technologies Inc said it has reached an agreement in principle to buy Oakleaf Corp, which supplies finance, insurance and leasing computers to auto dealers. The transaction will involve an exchange of Oakleaf stock for cash and debt and is subject to a definitive agreement, the companys said. No other terms were disclosed. Oakleaf had 1986 sales of about 26 mln dlrs.