April 12 (Reuters) - The following bids, mergers, acquisitions and disposals were reported by 1015 GMT on Wednesday:
** Rebel shareholders in Dutch paint maker Akzo Nobel AKZO.AS want to oust the company chairman after Akzo refused to engage in takeover talks with U.S. rival PPG Industries (NYSE:PPG) PPG.N . Japan's Toshiba Corp 6502.T has narrowed down the field of bidders for its chip unit to four suitors including Broadcom Ltd AVGO.O and Western Digital Corp WDC.O , two sources with knowledge of the matter said. U.S. pipeline operator NuStar Energy LP NS.N said on Tuesday it would buy privately held Navigator Energy Services LLC for about $1.48 billion, as it seeks to expand into the Permian basin. British American Tobacco (BAT) BATS.L said it had agreed with Bulgarian cigarette maker Bulgartabac to acquire some of its leading cigarette brands in a deal worth more than 100 million euros ($106 million). Swiss pesticides and seeds group Syngenta AG SYNN.S said Mexican regulatory conditions for approving ChemChina's CNNCC.UL planned $43 billion takeover bid will not have a major impact on the business.