Synthesizing Trenbolone Undecanoate The Forgotten Long-Ester Ghost

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
 
Just why, peoples are doing well already with the currents common esters (enanthate, acetate, etc..).
I don't exactly settle with what's already established. I tend to do things that other people are not doing as a standard for myself anyways.

I just wanted to do it because it's fun. And that's all the reason I have.

You can lurk if you want. I like it when a lot of people are watching me, it makes me work better.
 
Not my cup of tea but I'm super interested to watch! I've always wondered about making Nandrolone or Boldenone Enanthate. Out of curiosity, what are you expecting out of Tren Undeca that couldn't be had with Tren Hex? Half life stretches from 8ish days for Hex to 20 right?
 
Not my cup of tea but I'm super interested to watch! I've always wondered about making Nandrolone or Boldenone Enanthate. Out of curiosity, what are you expecting out of Tren Undeca that couldn't be had with Tren Hex? Half life stretches from 8ish days for Hex to 20 right?
So basically nothing! Its just longer ester and stays more stable. But I have deeper plans outside esterifying and before I can get to that part I need to start with intermediate steps and learn from there.

This is just to have it made and know its part of my analysis samples later. I have a whole thread on that called the purifying project. It all ties together in some way.
 
This is really cool. I can't wait to see how this turns out. Think about it. If you get good at this, you can just pick up the base product and esterize it into whatever kind you want. I always figured it's good to go with the same ester on things if possible--less pins, less pin days.

e.g. Maybe someone likes NPP and that's good for pinning on Mon, Wed, Fri. However, they have access to Test Cyp, which is nice if you want to pin twice a week. You might be able to time things right, or just pin less Test Cyp in conjunction NPP. Wouldn't it be nice to just pin Testosterone Phenylproprionate along NPP? There is such a thing, just as there is Nandrolone Enanthate I believe, but they're pretty damn rare and much harder to find.
 
This is really cool. I can't wait to see how this turns out. Think about it. If you get good at this, you can just pick up the base product and esterize it into whatever kind you want. I always figured it's good to go with the same ester on things if possible--less pins, less pin days.

e.g. Maybe someone likes NPP and that's good for pinning on Mon, Wed, Fri. However, they have access to Test Cyp, which is nice if you want to pin twice a week. You might be able to time things right, or just pin less Test Cyp in conjunction NPP. Wouldn't it be nice to just pin Testosterone Phenylproprionate along NPP? There is such a thing, just as there is Nandrolone Enanthate I believe, but they're pretty damn rare and much harder to find.
Great thinking.

And that's exactly what I'm hoping to find other interested in.

There's so many different esters that can be utilized other than what's the norm. Granted the sides and unknowns are not documented but fine tuning a protocol would be great! Imagine a low dosage tren protocol that is just enough to impart the effects we want but in injection frequency that feels like child's play. I just love the long esters! Another one I'm looking to make is

Testosterone buciclate - Wikipedia


This one is unattainable status but no one says you can't make it!
 
I use longer esters too, never even touched Test Prop or Ace, I don't want to have to pin that often. Plus some folks don't get along with short esters. I've seen folks that cannot tolerate Tren Ace, they suffer horrible sides. Move em over to Tren Enanthate, less sides, Tren Hex and suddenly they're in love!

Wow, buciclate is a really long ester according to that wiki file. 29 - 60 days in some instances. That would be amazing for TRT purposes.
 
I use longer esters too, never even touched Test Prop or Ace, I don't want to have to pin that often. Plus some folks don't get along with short esters. I've seen folks that cannot tolerate Tren Ace, they suffer horrible sides. Move em over to Tren Enanthate, less sides, Tren Hex and suddenly they're in love!

Wow, buciclate is a really long ester according to that wiki file. 29 - 60 days in some instances. That would be amazing for TRT purposes.
Side is it makes you sterilized at high enough dosages. Could be a good thing for some. Male birth control?
 
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