* The energy sector dropped 1.1% and was among the worst performing sectors on the main index.

* The sector pressured by oil producers Imperial Oil Limited which fell 2.2%, the most on the TSX, and Tourmaline Oil Corp, down 2%.

* At 9:39 a.m. ET (1439 GMT), the Toronto Stock Exchange's S&P/TSX composite index was down 28.59 points, or 0.17%, at 16,861.23.

* The materials sector, which includes precious and base metals miners and fertilizer companies, lost 0.2% as gold futures fell 0.8%.[GOL/]

* On the TSX, 81 issues were higher, while 131 issues declined for a 1.62-to-1 ratio to the downside, with 15.64 million shares traded.

* The largest percentage gainers on the TSX were Norbord Inc, which jumped 12.3%, after West Fraser Timber agreed to buy the lumber producer, and e-commerce platform Shopify Inc, which rose 2.6%.

* The most heavily traded shares by volume were Sun Life Financial Inc, Suncor Energy Inc and Air Canada.

* The TSX posted two new 52-week highs and no new low.

* Across all Canadian issues there were 11 new 52-week highs and two new lows, with total volume of 29.00 million shares.

(Reporting by Amal S in Bengaluru; Editing by Amy Caren Daniel)