esters

It's also common to the chemical group that they break down quickly, because they tend to be esters and alcohols.

Many wines, especially whites, tend to lose too many of their ideal esters with age, while gaining too many undesirable notes.

Archae have ether linkages in their lipids, bacteria and eukaryotes have glycerol esters.

There are aldehydes and esters from the peating of the grain and the oak cask aging that you are not appreciating when it's chilled.

Also, some esters have CNS effects all by themselves.

Not really sure where you got the idea that the some esters of testosterone are ok for first time users and others aren't, except maybe no ester.

After derivatization to butyl esters using 5% hydrochloric acid in butanol, the samples were separated on a C18 column using a gradient consisting of water and acetonitrile.

Now we have the pieces of the story: Sperm whales use unusual rheological properties of wax esters in order to control buoyancy, and these properties also make such chemicals an ideal lubricant for extreme pressure applications.

Robust Belgian yeasts generate a surprising amount of effervescence, which keeps things light despite the heavy doses of malted barley, and produce esters that generate flavors of banana bread and dark stone fruits that compliment latent notes of burnt sugars and caramel.

Notably in both model animals (nematode worms and mice) they specifically fed them ketone esters, meaning that if the mechanism also works in humans (which seems likely) then this could be used as a drug if people don't want to commit to fasting or keto diets.

These studies have shown that the exclusion of arachidonic acid from the diet (vegan diet) causes a progressive decrease of this fatty acid from 11 + 3% of the total fatty acids in the cholesterol esters of the plasma to 8 + 2% after 6 weeks.

None of these are imaginary, as each of these are linked to a specific chemical compound, such as acetaldehyde, diacetyl, DMS, various phenols and esters, and of course hop oils and various humulones, cohumulones, etc.

Many/most pthalates are far from what chemists consider "hydrophobic", and are in fact esters, alcolhols and acids.

This is true generally in pharmacology, but the plasma concentration of the androgen esters (prodrugs) isn't a good measure of "active" testosterone in your system.

“Ketone Administration for Seizure Disorders: History and Rationale for Ketone Esters and Metabolic Alternatives.” Frontiers in Neuroscience 13 (2019).

Similarly, A "wax" can have all of the stuff that I think you'd (probably?) characterize as a "reactive functional group" -- things like esters, alcohols, and ketones.

Esters don't hydrolyze that quickly under acidic conditions, especially if the carboxylic acid is bulky at all.