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Potential Safety Hazards Associated with Pd-Catalyzed Cross-Coupling Reactions
The potential safety hazards associated with Pd-catalyzed cross-coupling reactions have been underappreciated and inadequately discussed. These hazards have not been universally recognized in the past decades, perhaps overshadowed by the ubiquity of this class of chemistry and the desire to pursue new scientific advancements. The awareness of these hazards is further limited by the fact that synthetic chemists who develop these types of reactions on small scales are not typically trained in reactive chemistry hazard evaluation, and existing studies from industrial chemists and chemical engineers are often not published in journals that are commonly read by academic groups and synthetic chemists that typically work on small scales. This review summarizes observations of the exothermic behavior associated with the Pd-catalyzed α-arylation, Buchwald–Hartwig amination, Kumada–Corriu, Mizoroki–Heck, Negishi, Sonogashira, and Suzuki–Miyaura cross-coupling reactions. This exothermic behavior is consistently observed across each subset of cross-coupling reactions and appears to be relatively independent of the nucleophile, electrophile, base, solvent, and catalyst system employed. The magnitude of the exotherms poses potential safety hazards that could result in runaway scenarios in cases where the maximum temperature of a synthesis reaction (MTSR) exceeds the solvent boiling point and/or the onset temperature for reaction mixture decomposition. This contribution will serve as an educational resource to encourage researchers to conduct reaction safety evaluations and to develop control strategies accordingly to mitigate such potential safety risks prior to practicing Pd-catalyzed cross-coupling as well as other transition-metal-catalyzed cross-coupling reactions.
industrial  discovery  environmental  metals 
21 days ago by dchas
Danish tests detect excessive levels of heavy metals in jewellery
The Danish Consumer Council's Think Chemicals initiative has found high levels of heavy metals in cheap jewellery purchased from large retailers, independent stores and online.

Tests showed that seven out of 17 items did not comply with legal requirements. Six items contained excessive levels of nickel, which is allergenic, at ten to 344 times over legal limits.

"Once you have developed a nickel allergy you will be sensitive to the substance for the rest of your life. Studies have shown that eight to 18 percent of Europeans have developed a nickel allergy," the Council said.

Some of the jewellery sold from non-EU online stores contained lead and cadmium above permitted levels – with four out of five items determined illegal.
Denmark  public  discovery  environmental  metals  illegal 
25 days ago by dchas
Horse Hill Oil Field: HH-2z Horizontal Update - RNS - London Stock Exchange
UK Oil & Gas PLC ("UKOG" or the "Company") Horse Hill Oil Field: HH-2z Horizontal Update UK Oil & Gas PLC (London AIM: UKOG) is pleased to announce that its…
business  finance  trading  investment  mining  oils  precious  metals  minerals  watchlist 
5 weeks ago by asaltydog
Alba Mineral Resources Share Chat. Chat About ALBA Shares - Stock Quote, Charts, Trade History, Share Chat, Financial Terms Glossary.
Alba Mineral Resources Share Chat. Chat About ALBA Shares - Stock Quote, Charts, Trade History, Share Chat, Financial Terms Glossary.
business  finance  trading  investment  mining  gold  oils  precious  metals  minerals  watchlist  forum 
5 weeks ago by asaltydog
Alba Mineral Resources PLC (LON:ALBA) Share Price | RNS News, Quotes, & Charts | ALBA.L |
Alba Mineral Resources PLC (LON:ALBA) Share Price and News. Alba owns and operates mining projects in Greenland (graphite, ilmenite, base metals, gold and cobalt), Wales (gold), and Ireland (base metals), as well as having investments in the onshore UK oil; gas sector.
business  finance  trading  investment  mining  gold  oils  precious  metals  minerals  watchlist 
6 weeks ago by asaltydog
Cornish Lithium Ltd | Lithium exploration within Cornwall, UK
Cornish Lithium is a highly innovative mineral exploration and development company focused on the environmentally sustainable extraction of lithium from…
lithium  mining  trading  investment  metals  cornwall 
8 weeks ago by asaltydog
Series of explosions rock California Oktoberfest celebrations
(HUNTINGTON BEACH, Calif.) -- A series of explosions rocked an Oktoberfest celebration in Huntington Beach, California, injuring five people.

Authorities on Saturday responded to the scene at 8:10 p.m. local time to reports of multiple explosions that caused a transformer fire at the Old World Village complex. The complex had been hosting the Old World Village Oktoberfest festival.

Staff at a festival restaurant noticed an odor coming from an underground vault just outside the facility, Jeff Lopez of the Huntington Beach Fire Department told reporters Sunday. The underground vault contained three transformers but only one exploded. At one point the vault's 50-lb. metal lid flew off during the explosion, Lopez said.

Two firefighters at the scene were injured and treated at a local burn center. Both have been released. A third person is still hospitalized with moderate to severe injuries, Lopez said. Damages to the restaurant were minimal.
us_CA  public  explosion  injury  metals 
9 weeks ago by dchas
Chalice Gold Mines Ltd: Good project, "fantastic potential"
This the first in a series of regular articles from contributor Simon Popple, who owns and runs the Brookville Capital Newsletter, which specialises in mining sector coverage.
business  finance  trading  investment  mining  gold  precious  metals  minerals  watchlist 
september 2019 by asaltydog
Ores Containing Cobalt | Cobalt Institute
Mineralogy and deposits: a wide range of minerals contain cobalt although many are rare or unique to individual localities.

Cobalt looks set to become one of the most important commodities in delivering the electric vehicle revolution – thanks to rising demand for the metal in the batteries that power them.

It is also used as a super alloy in aircraft engines, and in cemented carbides, which are often used as hard cutting surfaces or drill bits.
geology  mineralogy  mining  cobalt  metals  magnetic  minerals  market  trends  watchlist 
september 2019 by asaltydog
32 years after poisoning, cleanup launched at arsenic site
KENT, N.Y. (AP) — In the weeks after they moved from New York City to their dream home in the leafy countryside, Norman and Alicia Berns grew ill with nausea, numbness and crushing fatigue.

She tried to restore her health by drinking plenty of water, but that turned out to be the worst thing she could do.

"We were just getting progressively sicker, and the doctors couldn't figure out why," said Norman Berns.

Tests eventually revealed the Bernses had arsenic poisoning. They were hospitalized and endured weeks of therapy to purge the toxic metal from their bodies. County and state health investigators found arsenic had leached into their well from a long-abandoned mountainside mine, and the Environmental Protection Agency installed a tank for trucked-in water at their home.

That was in 1987. This spring, the federal Agency for Toxic Substances and Disease Registry warned that arsenic in the soil surrounding 10 homes in the neighborhood where the Bernses once lived poses a "significant threat to human health."

Hazmat-suited crews from the EPA blanketed yards with wood chips and gravel to prevent contact with the toxic soil. The state posted warning signs for hikers and mountain bikers in adjacent parkland.

Some residents are surprised to see such urgent action three decades after the Bernses were sickened.
us_NY  public  discovery  injury  metals 
august 2019 by dchas
Sub-Zero Real Yields Are Boosting the Rush to Gold - Bloomberg
Gold, once mocked for its lack of yield and practical use, offers something the growing pile of negative-yielding bonds doesn’t -- inflation protection . Plus,…
business  finance  trading  investment  portfolio  gold  watchlist  news  articles  bloomberg  precious  metals 
july 2019 by asaltydog
Cobalt demand forecast to grow significantly in the next decade
Roskill analyst Jack Bedder gives his views on the outlook for Cobalt. Bedder says that although prices have fallen back and market sentiment is depressed, he's forecasting significant demand growth over the next decade, with the market expected to roughly double in size.
business  finance  trading  investment  portfolio  watchlist  news  analysis  mining  cobalt  metals  magnetic  minerals  market  trends 
july 2019 by asaltydog
Dietary Supplement Use, Nutrient Intake, and Mortality Among U.S. Adults | Annals of Internal Medicine | American College of Physicians
During a median follow-up of 6.1 years, 3613 deaths occurred, including 945 CVD deaths and 805 cancer deaths. Ever-use of dietary supplements was not associated with mortality outcomes. Adequate intake (at or above the Estimated Average Requirement or the Adequate Intake level) of vitamin A, vitamin K, magnesium, zinc, and copper was associated with reduced all-cause or CVD mortality, but the associations were restricted to nutrient intake from foods. Excess intake of calcium was associated with increased risk for cancer death (above vs. at or below the Tolerable Upper Intake Level: multivariable-adjusted rate ratio, 1.62 [95% CI, 1.07 to 2.45]; multivariable-adjusted rate difference, 1.7 [CI, −0.1 to 3.5] deaths per 1000 person-years), and the association seemed to be related to calcium intake from supplements (≥1000 mg/d vs. no use: multivariable-adjusted rate ratio, 1.53 [CI, 1.04 to 2.25]; multivariable-adjusted rate difference, 1.5 [CI, −0.1 to 3.1] deaths per 1000 person-years) rather than foods.
supplement  risk  variables  vitamins  minerals  metals  dietary  food  benefit  peer-reviewed  research  human  cohort  study  mortality 
april 2019 by Michael.Massing
Jersey City scrap yard fire blows black smoke for miles
JERSEY CITY — A fire at a scrap metal yard sent thick black smoke into the air on Thursday afternoon.

Both ground and marine units, including from the New York Fire Department, responded to Sims Metal Management on Linden Avenue East in an industrial section south of the Greenville section. The fire erupted about 4:30 p.m., according ABC 7 Eyewitness News.

 

The fire is also filling the air with a chemical smell, according to Hoboken police Chief Ken Ferrante. The New York City Office of Emergency Management also issued a warning about the smell.

The yard is located along the New Jersey Turnpike's Hudson Bay Extension, causing some rubbernecking delays. Winds from the southeast are blowing the thick black smoke toward the Meadowlands, according to New Jersey 101.5 Meteorologist Dan Zarrow.
us_NJ  industrial  fire  response  metals  waste 
april 2019 by dchas
Twitter
RT : Estimates of the 2015 global and regional disease from four – arsenic, cadmium, lead and…
burden  metals  foodborne  from twitter
april 2019 by mbbatz

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