Ian;
It is well known that Benzene sulfonates help PPDs dissolve! In fact, a close analog, pTosyl (para Toluene Sulfonic Acid) is used for all CD3 developers and CD6 developers today.
PE
Grant;
AFAIK, Benzenesulfinian is Benzene sulfinic not sulfonic which would be -sulfonian or somehing like tht. Polish speakers please verify my very rusty translating efforts of organic chemistry.
An afterthought: We might ask pavel if he can verify that his Russian translation is benzene sulfonic..... That might also be questioned in view of my notes on Sulfinic acids.
PE
Gentlemen,
Really - I made with mistake with transliteration: the chemical stated in the book and the one I used is Sodium Benzenesufinate. And I assume the polish literation is the same.
I tried to look for different sources about sulfonate and sulfinate, and it seems that both of them can be used as ani-oxidants. There is not much info unfortunately.
Go here to see the spelling of benzene sulfinic acid in czech.
Dead Link Removed
There is more doubt growing in my mind about this. Sulfinic acids and Sulfonic acids are distinct in Polish, Czech and all other languages I have researched.
One is -SO2H and the other is SO3H, and they differ in activity much as sulfite and sulfate do, thus explaining the antioxidant properties claimed for the Sulfinates in literature.
PE
Didn't benzyl alcohol serve this porpose as well - as a cosolvent?
Benzyl Alcohol ... It has not relationship to the present discussion in any way.
Ian;
I know nothing about benzene sulfonate itself as an antioxidant.
As for the properties of benzene sulfonates or p-tosylates as antioxidants or as helpers in dissolving, it is known from fundamental chemistry that organic aryl amines (metol, pAP, and PPDs) all oxidize rapidly as free bases and dissolve slowly as free bases. If they are predissolved in an equmolar solution of ANY acid, then they dissolve much more rapidly in water and they are much more resistant to aerial oxidation
PE
Oh well...
I think there is a hazard to having the last post on a page. People always seem to skip right past them onto the next page...
So help me, I am not trying to make fun of you but of myself. I was trying to remember where I used the term "PPD" before. Suddenly it came. It is from a previous life and there it means "Post Prandial Depression", which is what makes one want to fall asleep after a meal. It is an important part of Human Factors Research.
It is from a previous life and there it means "Post Prandial Depression", which is what makes one want to fall asleep after a meal.
What do they call it when after looking at screen after screen of mass spectral data, you start to fall asleep? That's what was just happening to me. (But then is a bit after lunch too...)
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