Check out this AE half-life profile of various drugs

[Audio8]

bizzump for the late night crew

 

[trenbolone]

Still looking for Boldenone UNDECYLENATE ester half-life... C'mon, somebody must know! It's used in animals for god's sake, so there must be some research papers about it, and besides it's used by thousands of athletes all over the world!

 

[DOM]

undecyclenate will be very similar halflife to undecanoate.

 

[Nimrod25]

I have a problem with something. Everyone knows that half-life is influenced directly by the number of carbon atoms in the chemical structure. Now cypionate has 8 carbons and a half-life of about 12 days. Enanthate has 7 carbons and a half-life of about 10 days. Now lets take a look at Phenylpropionate. The definition for Phenyl is a molecular group formed by substituting one of the hydrogen atoms attached to a benzene ring. Now the benzene ring has 6 carbons, combine that with the 3 carbons in propionate and u have 9 carbons total in Phenylpropionate, making its half-life slightly longer than that of cypionate or enanthate. What u guys think?

 

[trenbolone]

DOM:

Please be more precise... is this your personal opinion, do you have anything to prove it with etc...

But anyway, thanks for replying!

 

[DOM]

These are from elitefitness esters article.

Undecylenate:
Also referred to as Undecylenic acid; Hendecenoic acid; Undecenoic acid. This ester is very similar to decanoate, containing only one carbon atom more. Its release duration is likewise very similar (approximately 2-3 weeks), perhaps extending a day or so past that seen with decanoate. Undecylenate seems to be exclusive to the veterinary preparation Equipoise (boldenone undecylenate), although there is no reason it would not work well in human-use preparations (Equipoise certainly works fine for athletes). Again, weekly injections are most common.

Nimrod, this description notes that it extends release a few days longer than propionate without the phenyl group, but that is still not as long as would be predicted by the length of the carbon chain. There is probably some reason that the cyclic carbon structure does not inhibit water solubility as much as the straight chain structure, but I dont' know what it would be.

Phenylpropionate:
Also referred to as Propionic Acid Phenyl Ester. Phenylpropionate will extend the release of active steroid a few days longer than propionate. To keep blood levels even, injections are given at least twice weekly. Durabolin is the drug most commonly seen with a phenylpropionate ester (nandrolone phenylpropionate), although it is also used with testosterone in Sustanon and Omnadren.

 

[trenbolone]

Thanks!!!

By the way, the info you posted looks very interesting, where can I see the rest of the article?

-John

 

[DOM]

trenbolone,

halflives of esters depend on the length of the carbon chain, and since undecanoate and undecyclenate both have the same number of carbons, their halflives will be very similar (they have the same prefix unde- which denotes eleven carbon atoms, but one has a cyclic structure and the other a straight chain structure).

Nimrod, strange that undecyclenate and undecanoate have pretty much identical halflives while phenylpropionate is so different from other 9 carbon esters.

Hopefully one of the board's chemists will shed some light on this.

 

[DOM]

www.elitefitness.com/articledata/esters.html

There are lots of good free articles on the elitefitness site. Just click on articles/news and get reading.

 

[trenbolone]

Wow! This is getting interesting...

So what is the main difference in a cyclic carbon structure and a straight one? I mean in practise, how do they differ, why to use a straight structure instead of a cyclic and vice versa? There must be some difference in release between the straight and cyclic one...?

I don't know why, but this just started to interest me...

-John