# "Venting" my Adventures

**URL:** <https://pheromonetalk.com/t/venting-my-adventures/24664>\
**Category:** Women's Journals\
**Created:** [January 8, 2009, 8:53pm UTC](https://pheromonetalk.com/t/venting-my-adventures/24664 "2009-01-08T20:53:37Z")\
**Posts on this page:** 1\
**Showing post:** 670

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**Author:** ![diane999](https://sea2.discourse-cdn.com/flex016/user_avatar/pheromonetalk.com/diane999/32/1110_2.png) [@diane999](https://pheromonetalk.com/u/diane999)\
**Post date:** [June 15, 2009, 9:15am UTC](https://pheromonetalk.com/t/venting-my-adventures/24664/670 "2009-06-15T09:15:29Z")

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Sorry! I got lost in a P91 fog.

3-_hydroxy_-13-methyl-12,14,15,16-tetrahydro-11_H_-cyclopenta[a]phenanthren-17\*-one\* - **Equilin** - is pictured below on the left. As you can see, there is a hydoxyl group attached on the left. This position is carbon 3.

It also has a a double bonded O at carbon 17, so it is a ketone (-one).

3-hydroxy-13-methyl-6,7,8,9,11,12,13,14,15,16- decahydrocyclopenta[a]phenanthren-17- one - **Estrone** - is pictured below on the right. It also has a hydroxyl group at position 3, and a double bonded O at position 17, and is also a ketone.

The difference between the two is the extra double bond C=C in the second ring of equilin and the position in space of the hydrogens. A double bond changes the shape of the molecule, as well as its functionality with regards to its _free energy of activation_. The free energy of activation determines how reactive a chemical compound is.

So, even though the two sound somewhat similar, are both contain a hydroxyl and a ketone groups at the same positions, and look very similar on paper, they are completely different.

Diane

Edit: Sorry, I need these pictures for another thread: [Can someone identify this molecule: is it Meo-Est?](https://pheromonetalk.com/t/can-someone-tell-me/30316)

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