Herbert Smith Freehills and Freshfields Bruckhaus Deringer have advised on the $3.1bn (£1.98bn) private share placement of Asia’s largest oil and gas company, Hong Kong-listed China Petroleum & Chemical Corp (Sinopec).

The pair advised on both the Hong Kong and US aspects of the deal, which is the largest equity transaction in Asia this year and Sinopec’s first major equity offering since its initial public offering in 2000.