hypervalent_iodine

6 minutes ago, StringJunky said:

@Phi for All I don't care that I have 12000 posts, I want them got rid of now. If you don't I'll empty SFN of cheese nips. 

When one posts one should accept it's there forever and even if they were deleted, it is still kept under various government retention Acts or Decrees for some specified minimum time in the servers.

You’d have to find them all first.

I think you have still neglected to include context as some of those questions are not answerable as-is. 

Briefly:
As written, your answer to 1 (a) i doesn’t make sense, or it is just incorrect. It doesn’t specify indium nitrate or metal, but I would read that to mean elemental indium. I assume there is more context here. Also, it is more correct to say it is in group 13 (group 3 is still accepted), but that does not mean the oxidation state is going to be 3+. In⁺ is also possible, for example. 
 

I would also add that saying hydrogen is reduced is not the best wording. Better to specify H+.

8 minutes ago, iNow said:

Blike IINM

Correct. 

They are listed in the staff directory as an admin and the mods and admin all know who he is, but that doesn’t always mean we can get in touch easily. Honestly, it wouldn’t be SFN if we didn’t let the domain lapse every few years. 

Is RP chromatography a possibility? I normally use C18 cartridges on an MPLC unit for any of my peptide work and haven’t had an issue. I would also normally use 20% piperidine in DMF for Fmoc removal, but this is for SPPS so possibly not as easy in solution phase. The other option, which might be a bit much if this is just a single amide bond you’re making or your starting material is precious, is to load it onto a resin and do the synthesis that way.

2 hours ago, iNow said:

Who cares? It’s the internet. For all we know, they’re genetically modified kittens who learned to type.

All that matters is WHAT gets posted, not WHO posted it. 

Thank you, and I’ll say I worked very hard on teaching them how to type / finding an appropriately sized key board, so it’s nice to have my work recognised.

6 hours ago, beecee said:

Your point is actually spot on. My intentions in starting this thread was to highlight extreme weather events  happening far more often, and the climate change connection.. 

Yes, there is/was a difference. Plus the overall effect of this system, going beyond Brisbane makes it probably the worst. This system has moved down the coast, into NSW and flooded towns like Lismore and Grafton, and at this moment is battering Sydney and the south coast. 4 dead so far but it is expected to go higher.

A point I wholeheartedly agree with. There is a lot of literature in the crisis management space that discusses this and treats the increase in frequency and severity due to climate change as a given. The way that plays out in policy is interesting. 

As a side note, the floods in 2011 didn’t just hit Brisbane either, they impacted roughly 75% of QLD all told. We won’t really be able to know how the damages and costs compare until it’s finished battering the NSW coast, but I would guess you are right that the net effect including NSW (especially Sydney) might tip the net cost over what happened in 2011. It also looks like we’re getting severe thunder storms and giant hail tomorrow up here, so fingers crossed we get through round 2 relatively in tact. 

6 hours ago, beecee said:

In 2011, we had catastrophic floods that were seen as one in a hundred year event: 11 years later we have these floods that are even worse according to the peak river levels. Some redefining needed with the influence of climate change methinks. 

The rainfall totals for this current event have been staggering to say the least.

From 9am Thursday to 9am Monday three stations recorded over a metre of rain:

- 1637mm at Mount Glorious, QLD - 1180mm at Pomona, QLD- 1094mm at Bracken Ridge 

Brisbane has absolutely smashed its three-day rainfall record with 677mm, by recording over 200mm each day for three days in a row

Before this week it had never even had two consecutive days over 200mm and had only ever recorded eight in total.


The mean annual rainfall for Brisbane is 1011.5mm and it recorded 741mm in just the four days from 9am Thursday and 9am Monday.


Speaking of records, Weatherzone is reporting Dunoon in NSW recorded the second-highest daily rainfall total in NSW when 775mm fell in just the 24 hours to 9am Monday.


If you are not sick of stats yet, Doon Doon in NSW picked up a whopping 1040mm of rain in just the 48 hours to 9am Tuesday. That is over a metre of rain in just two days.

https://www.farmonlineweather.com.au/news/how-unusual-is-all-this-rain-were-having-the-answer-very/536372

And as this weather event has moved south, today is Sydney's turn, not that El Nino has not already given us our wettest summer ever!

I don’t want to detract from your main point too much, but I have lived in Brisbane through both. The 2011 ones were way worse, but also quite different. Those ones came after months of non-stop rain. They didn’t manage the dams properly and sent a tidal wave down the river when it got to the point where they had no option but to release water. The damage and flood levels were considerably higher in 2011. The house I lived in at the time was thankfully on a hill that became an island for a few days and we were without power for four days, but we were lucky. Even before this weekend there were properties that had not yet recovered from 2011, largely thanks to insurance companies who refused to pay out and people being forced into bankruptcy. These floods came quickly and surpassed predictions, which did mean that people that probably should have evacuated did not. There were a surprising number of deaths, but if I had to guess I’d say the suddenness of it all was at least partly to blame. Properties and areas that didn’t have good drainage suffered badly, but 2011 was still worse. 

My assumption is that it is asking you for the masses of each individually to make up a litre of solution with those concentrations and that the first number is meant to be in M. The last bit is an assumption though so I would check that. How much is also kind of vague and not stated but the only way I can think to answer it (it isn’t even really a question it’s just a statement) with that information is with masses.

What reactions have you learnt about so far that might fit? Can you identify where the fragment on the left appears in the product?

While this thread is closed and (I think) being the only person who identifies as female in this thread, I just wanted to provide a little food for thought. Of all the women in my life with whom I am close to, I can't think of a single one who hasn't been sexually assaulted or raped by a man at some point in her life. I cannot say the same about the men I know wrt to false accusations. Anecdotal I know, but something to think about. 

I think it’s also important to note that we don’t always agree on a particular course of action such as banning every time it is suggested and will make compromises that everyone can agree to regularly. Conferring with one another isn’t merely an exercise in box ticking. 

2 hours ago, Klaynos said:

I agree. Having friends who were on short term contracts for 20 years makes me somewhat cynical. 

What, you don’t like rolling 3 month contracts completely contingent on obtaining a portion of the ever-dwindling pools of grant money available? Weird. 

After some further discussion, staff have updated the above to now read:

Quote

Attached documents should be for support material only; material for discussion must be posted. Documents must also be accompanied by a summary, at minimum. Owing to security concerns, documents must be in a format not as vulnerable to security issues (PDF yes, microsoft word or rich text format, no).

I’ve met a couple of members IRL when I’ve been in the US and have considered them friends at various points. Others I knew digitally when IRC was a thing, and a few I am friends with on FB. These days I generally avoid crossing streams. 

On 12/18/2020 at 10:31 AM, MigL said:

anyone remember Overtone ?

Difficult to forget that one. 

You will need to attempt this yourself before we can help you. What are your thoughts?

1 hour ago, studiot said:

Reading this more thoroughly I think the bottles must all contain white powders, not solutions as I originally thought.

So you will have to make you own solutions.

So you should add two further actions to your table:

Solubility in water and solubility in dilute HCl.

Are all the reagents listed going to be soluble in both ?

Solubility in barium chloride as well. 

I agree with Sensei. Get a model kit or even just some tooth picks and blu tack. Make something with four different substituents and make its mirror image, then try and rotate the mirror image so that it is identical to the first molecule. You’ll find that it doesn’t work because they are not superimposable. If you repeat the process but with two substituents that are the same, you should find that you can rotate them to look identical (hence it is not chiral). The example you gave doesn’t work since by your own logic, the two mirror images are superimposable.

You mean by their chemical shifts etc? There are many resources online that will go through it. 

5 hours ago, Anchovyforestbane said:

How specifically does the direction in which a molecule directs light effect how they fit together?

It doesn’t. The stereochemistry and how they occupy space is what matters. A good illustration of why this matters in drug design is your feet. They are mirror images of one another but nonsuperimposable in the same way enantiomers are. You will probably know from experience that if you try to put your left shoe on your right foot or vice versa, it won’t fit very well. The same is often true for chiral drug molecules and their molecular targets (eg. enzymes). In the drug world, the quintessential example of why chirality matters a lot is thalidomide, which I’ll let you look up. 

I am unsure of what you are wanting to know here, so forgive me if I am off base. The l and d notation refers to the direction a chiral molecule rotates polarised light. To my knowledge, this property doesn't really affect stereochemistry, it's more that it is a consequence of it (i.e. only chiral molecules are able to do it). The reason molecules are able to exist as either l or d is because two enantiomers will rotate polarised light to the same magnitude, but in opposite directions. For example, if one enantiomer of a molecule rotates light by +10^o (d), then the other enantiomer will have an optical rotation of -10^o (l). 

54 minutes ago, MasterOgon said:

There is some new circumstantial evidence and logical justifications, but the main thing is a detailed description of the experiments with which you can establish the fact of this phenomenon. Among these are the simplest experiments that anyone can repeat. This article is being considered for publication in a scientific journal and received a positive review from a respected scientist. It is at the bottom of the page http://sci-article.ru/stat.php?i=1601957819 The reviewer's page contains links to information about him.
Thus, the fact is substantiated indirectly if there is an above average knowledge of aerohydrodynamics, it is proved experimentally with minimal means, and is confirmed by the opinion of a specialist. The only thing that is missing is links to authoritative sources confirming this fact, since it has not been studied by anyone yet.

Daniel Waxman has been banned as a sock puppet of drumbo.

Sometimes I think about removing it, but I just can't bring myself to pull the trigger. 

9 hours ago, zapatos said:

She literally had no idea how to apply, where to apply, how to fill out applications, and could get no help from those in her family as they were just as clueless.

This is a very good point! I am currently reading a lot in relation to some new (and generally awful) reforms to our higher education sector that were just passed here in Australia. In some of the submissions to parliament, it was highlighted that one the key factors leading to under representation of Indigenous people in universities is that they often don't know what they have available to them. As such, the prospect of enrolling and relocating seems financially daunting and confusing. It is also one of the things that can lead to low levels of retention. Students who live in more metropolitan areas (and more likely to be white) are much more exposed to university life, either through linkages in their school or because someone in their family has been, etc.