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  1. Replies
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    Re: Major Organic Compounds in Herbs and Spices

    Somebody else would probably say it, but I will anyway. The volatiles in Rosemary vary considerably.

    "Bay leaf" is so meaningless as a term I don't know how one could confidently state the main...
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    Re: Reducing Carboxylic Acids to Aldehydes

    I was making a lighthearted joke about the effort:payoff ratio, much as I assumed you were. If you read the first post of the topic, you'll notice chemistry in there. I figured I'd be safe enough...
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    Re: Reducing Carboxylic Acids to Aldehydes

    How about we split the difference? The obvious solution to our dilemma is to form bisulfite adducts and store them dry. :tongue:
  4. Thread: Humidity?

    by JayH
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    Re: Humidity?

    I think the sense of humidity may potentially be linked to traces of mustiness. Fungal or earthy smells could help.
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    Re: Reducing Carboxylic Acids to Aldehydes

    On the flip side...store your aldehydes as the corresponding alcohols, then oxidize them to aldehydes when necessary instead of messing with lithium aluminum hydride.

    :2vrolijk_08:

    I'm actually...
  6. Thread: Schiff's bases

    by JayH
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    Re: Schiff's bases

    Lemon flavor isn't a bonus? :)

    Okay, I kid, I kid.

    Vinegar should work. I think typical household vinegar is close to the same pH as lemon juice, though they both vary. You're right the citric...
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    Re: Must Have Equipment for your "Lab"

    In addition to those already mentioned, a hot plate capable of magnetic stirring, disposable gloves, glass bottles with polypropylene lined caps for storage, borosilicate beakers (and test tubes in...
  8. Thread: Schiff's bases

    by JayH
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    Re: Schiff's bases

    You are almost certainly correct. I found a couple references [x] [x] to using HCl as the catalyst, but it doesn't seem to be generally practiced. H2SO4 looks much more promising. Phosphoric acid...
  9. Thread: Schiff's bases

    by JayH
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    Re: Schiff's bases

    EDIT: No, never mind. I'm not engaging you.
  10. Thread: Schiff's bases

    by JayH
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    Re: Schiff's bases

    They'll still react, just differently than I had been thinking. See pages 39-40. luigi_g already touched on this in passing.

    Practically? It's acid-catalyzed and readily-available HCl would...
  11. Thread: Schiff's bases

    by JayH
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    Re: Schiff's bases

    Looks like you guys have things well in hand. :)

    Just dropped by to double facepalm and say ignore/forget nearly everything I said about indole; I forgot the aromaticity means it does not react...
  12. Thread: Schiff's bases

    by JayH
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    Re: Schiff's bases

    You can heat the water out. Perfumer's World has phenylacetaldehyde.
  13. Thread: Schiff's bases

    by JayH
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    Re: Schiff's bases

    We're discussing synthesis, so yes, it absolutely is. Understanding the reactions helps a lot when exploring new possibilities and allows for less common aromachemicals to be produced from readily...
  14. Thread: Schiff's bases

    by JayH
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    Re: Schiff's bases

    I'm terribly sorry, I didn't realize. My apologies for being overly sensitive. I wasn't even sure what I was supposed to have gotten wrong. I get that way sometimes when I'm confused.

    You're...
  15. Thread: Schiff's bases

    by JayH
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    Re: Schiff's bases

    Err, read what I wrote again and look at my diagrams, and my links. You're correcting something I haven't said. You're also confused on the mechanism.

    EDIT: The mechanism for the reaction between...
  16. Thread: Schiff's bases

    by JayH
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    Re: Schiff's bases

    I tried citral and methyl anthranilate last night without anything to dehydrate it but heat. It turned a spectacularly bright orange before going dark brown. It didn't cloud while I had it in the...
  17. Thread: Fig Accord

    by JayH
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    Re: Fig Accord

    Fig leaves/fruit volatiles analysis
  18. Thread: Schiff's bases

    by JayH
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    Re: Schiff's bases

    Heating reactions generally speeds them up unless they're already too fast to make much of a difference, or you're decomposing/boiling off one of the reactants. Looking at Wikipedia, the methyl...
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    Re: Oil based perfumes and wait time

    Fractionated coconut oil is one of the most stable non-synthetic carrier oils in widespread use. Virgin coconut oil will go rancid, though, which is probably why the stability of FCO is called into...
  20. Thread: Schiff's bases

    by JayH
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    Re: Schiff's bases

    Ketones form Schiff's bases, not just aldehydes. It's the carbonyl group that does it. "Aldehyde C-16" has one (and is an ester (and an epoxide!)).

    -innocent whistle-

    There may be other...
  21. Thread: Schiff's bases

    by JayH
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    Re: Schiff's bases

    I was joking. I'm not intending to deliberately wreck them, just acknowledging the possibility. :laugh:
  22. Thread: IFRA question...

    by JayH
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    Re: IFRA question...

    I might add a disclaimer about not complying with IFRA standards, or list the sensitizing ingredients on the label, but there's nothing legal I know of that says you can't sell it in the US....
  23. Thread: Schiff's bases

    by JayH
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    Re: Schiff's bases

    My mind's probably playing tricks on me then. I need to go sniff Indolene 50 again. That's interesting that your water separated out. It's exactly what I would hope for but you're the first I've seen...
  24. Thread: Schiff's bases

    by JayH
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    Re: Schiff's bases

    I use 3A molecular sieves because I'm used to them, but I'm usually working with water-thin liquids and there are other driers out there that would probably work just as well. Otherwise, you should...
  25. Thread: Schiff's bases

    by JayH
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    Re: Schiff's bases

    You can do that! Just don't do it in your perfume and expect consistent controllable results, especially if you have a bunch of different aldehydes. Do it in a separate reaction container with a...
  26. Re: Perfumer’s Supply House Tools – Table of Organic Chemistry Compounds and their Smells

    I thought hexanol smelled remarkably grassy myself, but as always personal interpretation will vary. I still don't see the chart as being definitively "wrong," since hexenol isn't even listed. It's...
  27. Re: Perfumer’s Supply House Tools – Table of Organic Chemistry Compounds and their Smells

    Hexanol, hexenol, hexanal, and hexenal all have a cut grass smell to them.
  28. Sticky: Re: IFRA Standards - Discussion thread (Temporary partial version)

    The bigger a company is, the more countries they sell in, and the more regulations they have to deal with, so it (sadly) makes sense for them to comply with the strictest from the outset. But smaller...
  29. Thread: Heliotrope accord

    by JayH
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    Re: Heliotrope accord

    Yes, heliotropin is an aldehyde.
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    Re: Refrigerating Aroma Chemicals

    Concentrated solutions of solid aromachemicals like vanillin may crash out at low temperatures and need to be redissolved, otherwise I personally don't see any reason not to go for it.
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    Re: Refrigerating Aroma Chemicals

    Most will last longer. It shouldn't be dangerous unless you're letting them get into your food, but I'd be leery of loose lids or stronger aromachemicals. You know how the taste of garlic can get...
  32. Thread: Old book smell

    by JayH
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    Re: Old book smell

    They're not difficult to get, aside from furfural and methoxyphenyloxime, you just have to look at lab chemical suppliers rather than perfume suppliers. Coincidentally, I've just gotten a couple of...
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    Re: Natural vs synthetic

    I don't know. I don't get into the "natural" debate. I'm just curious what standards natural perfumers tend to settle on, and exactly why they choose them, specifically with regards to fermentation,...
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    Re: Natural vs synthetic

    Why is fermentation considered to be any more natural than other chemical processing? Yes, it's something that occurs naturally, but it's also being done by humans. If I were to synthesize...
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    Re: Synth fixatives for naturals

    Hence the "though generally with some disclaimers for..." bit. There are always compounds that don't fit right in one definition or another.

    I very nearly proposed non-ionic carbon compounds...
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    Re: Synth fixatives for naturals

    Just to round things out as I realize I never posted anything to back up my preferred definition.

    "If the difference between organic and inorganic compounds isn't the presence of some mysterious...
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    Re: Is the Spam Trap Eating My Posts?

    Thanks, lpp. I think this marks the only time I've ever cared about losing a post count. :laugh:
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    Is the Spam Trap Eating My Posts?

    If so how to avoid it? I've never had this happen before, but the last post I submitted needed moderator approval to go through. The only obvious difference between it and the rest of my posts was...
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    Re: Synth fixatives for naturals

    Really? What does this mean, then?

    Regular SDAs are sold directly to consumers. If these "other SDAs" aren't sold to consumers due to "extreme flammability," either you're saying they're more...
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    Re: Synth fixatives for naturals

    I agree with the spirit of what you said, but there are a few corrections worth making without getting too nitpicky.

    Haha, no. No, it's not.


    Only as far as chemistry goes. There's a...
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    Re: storage of "other" aldehydes

    Lilial is an aldehyde. If someone has a handy list of every aromachemical prone to oxidation I will be greatly surprised. Which ones are you concerned about?

    Edit: Should have hit refresh.
  42. Thread: Alcohol

    by JayH
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    Re: Alcohol

    2-butanone (more commonly known as methyl ethyl ketone or MEK) has a very strong, sharp smell. It does evaporate more quickly than ethanol though.
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