Synthesizing Trenbolone Undecanoate The Forgotten Long-Ester Ghost

[SunWukong]

Definitely following for shits and giggles.

 

[TheScholarOfBrew]

Definitely following for shits and giggles.

Please bring your friends and family. Invite the whole gang! Bring pop corn! Make sure to stay safe. Wear goggles as acids and solvents are dangerous.

 

[AlexDavis43]

Perfect for that that tren fien who runs tren all year!


View attachment 327421

wtf is that guy rubbing the needle on his arm

 

[narta]

wtf is that guy rubbing the needle on his arm

evolution baby!

IM->SQ-Rub it

 

[dinfar1337]

Alright degenerates, here’s one for the archives. Because this will be be one of my most valuable learning experience so far

I’m initiating a small experimental synthesis of trenbolone undecanoate...... yes, it’s real, yes, it was studied, and yes, it did appear in the wild for a short time before vanishing into myth-tier status. This isn’t a “should I pin this” thread. This is a research log, and I’ll be walking through each step publicly.

Why tren undecanoate?
Because nobody’s done it right. And because it's chemically valid, rarely discussed, and worth exploring. A long-acting tren ester with theoretical injection spacing of 2–3 weeks? That’s the kind of curiosity that belongs in people's minds...,..

Purpose:
Not for use.... this is strictly a synthesis + validation project. I’ll be sending off samples to Jano for structural verification. I don’t pin unverified chemistry, and I don’t recommend you do either.

Stage 1: Acquiring tren base
You can't just “swap esters.” I’ll be starting with tren base (not acetate), and once that’s on hand, we move to the esterification reaction using undecanoic acid derivatives. It’s a simple two-step conversion for anyone competent:

1. Tren base


2. Undecanoic acid chloride or anhydride


3. Base (TEA/pyridine), mild solvent (DCM/THF)



Done under controlled temp, cleaned, crystallized, validated....

I’ll update this thread as I go... photos, reagent list, reaction outline, final spectra if all goes well.



For reference:

Trenbolone Undecanoate was first described by Roussel in the 1960s

It’s the C17β undecanoate ester of tren (just like Nebido is for test)

Never commercialized, possibly due to solubility/formulation issues or pharmacodynamics

Expect very slow release. Onset? Week+ delay. Clearance? Weeks. Side effects? Linger.????????

Tren Tren Tren Tren

Testosterone undeconate? Tren Undeconate?

Hell yes

so next is, when are you gonna synthesize primo base for us?

jk

 

[TheScholarOfBrew]

so next is, when are you gonna synthesize primo base for us?

jk

Primo undeconate?

 

[dinfar1337]

Primo undeconate?

no from dht to primo

 

[TheScholarOfBrew]

no from dht to primo

Its settled. I will make primo U. Tren U. mast U. halo U.

 

[trismegistus]

Tren side effects for months after my last pin? Where do I sign up!?

Not something I'd ever consider running but fascinated by the premise none the less.

 

[krvuxn]

Aren’t there issues with steric hindrance when trying to esterify a compound? As in you can’t necessarily add any ester to any hormone.

 

[AlexDavis43]

Aren’t there issues with steric hindrance when trying to esterify a compound? As in you can’t necessarily add any ester to any hormone.

Most of these steroids are very similar in structure, particularly around the esterification site.

Plus we've already seen many different esters of the main AAS. Seems to suggest not a big worry.

 

[dasking]

Its settled. I will make primo U. Tren U. mast U. halo U.

Please lol, I will collect them all one day...

 

[dasking]

Most of these steroids are very similar in structure, particularly around the esterification site.

Plus we've already seen many different esters of the main AAS. Seems to suggest not a big worry.

There is an unbelievable amount of ester variations i had no clue ever existed. Just the lists on Wikipedia are long and interesting for compounds and ester variants. Makes me wonder frequently what else can be accomplished.