* MSCI Asia-Pacific index down 0.9 pct
* Nikkei drops 0.9 pct, copper slide hits non-ferrous metal sector
* Wall Street extends losses on sagging technology shares
* Long-term US yields slip as curve flattening continues, USD dips
TOKYO, Dec 6 (Reuters) - Asian stocks slipped on Wednesday, dragged by losses on Wall Street as the technology sector stuttered yet again after a brief rebound, while the dollar sagged on lower long-term U.S. yields.
Weaker copper also checked risk sentiment. Japan's Nikkei fell 0.9 percent with non-ferrous metals producers suffering large losses after copper's slide overnight to a two-month low.
MSCI's broadest index of Asia-Pacific shares outside Japan dropped 0.9 percent.
Australian stocks shed 0.35 percent, South Korea's KOSPI lost 0.65 percent and Shanghai retreated 0.7 percent.
The S&P 500 information technology index barely rose overnight as it gave up much of the 1.4 percent intraday gains. The year's top-performing sector was still down nearly 4 percent over the past week, with investors shifting money to banks, retailers and other stocks seen as likely to benefit the most from tax cuts promised by U.S. President Donald Trump.
That pulled the S&P 500 down for the third straight session overnight. The Dow and Nasdaq also retreated.
"The retreat in U.S. shares coincides with profit taking by investors before they close their books for the year-end. A lot of such year-end window dressing already appears to have taken place in emerging market equities," said Kota Hirayama, senior emerging markets economist at SMBC Nikko Securities in Tokyo.
"The main focal point for emerging market equities is how U.S. yields move towards the year end. The Federal Reserve's monetary policy stance for next year bears close watching due to its impact on U.S. yields, and in turn the various equity markets."
Fed funds futures prices showed that investors see a rate increase at the Federal Reserve's Dec. 12-13 meeting as a done deal with much of the focus now on the outlook for rates in 2018 and beyond.
The two-year Treasury yield reached a nine-year high overnight, driven by the Fed's tighter policy path and on expectations the U.S. Congress will pass tax reform legislation.
But the 10-year Treasury yield fell overnight, flattening the yield curve further. The curve has flattened as investors see limited room for long-term U.S. inflation.
The dollar dipped, weighed by sagging long-term U.S. yields. The dollar index against six major currencies slipped 0.1 percent to 93.287.
The greenback lost 0.2 percent to 112.330 yen and the euro was little changed at $1.1830 after shedding 0.35 percent the previous day.
The pound stood at $1.3422 for a loss of 0.15 percent, having taken a small knock after Sky News reported of a foiled plot to assassinate British Prime Minister Theresa May.
Sterling had fallen to as low as $1.3370 on Tuesday on disappointment after May failed to clinch a deal to open talks on post-Brexit free trade with the European Union.
Bitcoin continued its relentless advance, climbing to a fresh record high of $12,205.46 on the BitStamp exchange .
In commodities, U.S. crude oil futures were down 0.45 percent at $57.36 per barrel after American Petroleum Institute data showed that U.S. gasoline stocks and distillate inventories rose more than expected last week.
Brent crude lost 0.4 percent to $62.60 per barrel, though it is up by over 40 percent since June, supported by a supply cut led by OPEC and Russia which is expected to last throughout 2018.
Copper on the London Metal Exchange crawled up 0.2 percent to $6,557 per tonne after sliding to a two-month low of $6,507.50 overnight.
Base metals were hit by a combination of the dollar's rise earlier in the week on U.S. tax reform hopes and a technical sell-off stemming from a rise in inventories. (Reporting by Shinichi Saoshiro; Editing by Shri Navaratnam)