Recent content by chemisttree

Trichlorofluoromethane has a bp of 23C or 73F. Like Russ says, it is a refrigerant. Not too hazardous unless you are an ozone molecule in the stratosphere.

ONLY if the leaving group is a quaternary amine. There are no organic chemistry books that label alkyl halide reactions with strong bases as “Hoffman”.

Why do continue to refer to E1/E2 eliminations involving alkyl halides as “Hoffman elimination”?

Activated alumina or silica would be quite expensive. Might as well not recycle at all and just toss it. His concept of “freeze distillation” (probably fractional freezing) may have mixed results. Still, that’s his best path forward as I see it.

Where did you read that? Hoffmann eliminations apply to quaternary alkyl amines in presence of a strong base. Is that the case here?

The alcohol is bulky and therefore NOT likely to be engaging in E2. Hoffman elimination has a strong base. Is there a strong base in this example? E1 is favored by a polar,non-nucleophilic solvent like t-Butanol and good leaving groups like I. This is textbook E1.

Sylcap is reported to cure faster than Sylgard l, so that’s a difference.

I don’t think that extraction will work, even for the ring-opened product. Distillation is your best bet if you have the equipment to do it. Don’t try running an engine with the distillate. Should be good for cleaning out those epoxy containers.

Peroxide would potentially oxidize any low valent copper but since copper sulfate is already oxidized (+2), nothing will happen. Peroxide works as a bleaching agent for organic stains which typically have extended pi bond systems but the color in metal compounds are inherent to their frontier...

I see. You are referring to plastics and not PFAS compounds.

I wouldn’t worry too much about it. Some people just dump it into ponds! https://www.agrisupply.com/crystal-blue-copper-sulfate-smart-crystals/p/54481/

It is not my experience that PFAS remediation and the establishment of exposure limits are being driven by governments or health bodies. It is also not my experience that PFAS chemicals are naturally broken down in the environment or that the science around the issue is of poor quality. Please...

We (USAF) have been operating under the assumption that the EPA’s recommendation of 70 ppT would eventually become an MCL.

We’re hearing that EPA is getting ready to publish an MCL for drinking water of 40 parts per trillion. Expecting this by late Summer or Fall. When that happens all H is going to break loose. This will go nationwide, so it’s coming to a water district near you! Good time to be in the...

The stars might be round because they are significantly dimmer than the satellite. Their round appearance was an image built up from an extended exposure for which the vibration contributed very little.