![For this synthesis reaction, for the formation of alkene, how do we know that the pi bond is not placed on the other C-C in the ring as shown in the red For this synthesis reaction, for the formation of alkene, how do we know that the pi bond is not placed on the other C-C in the ring as shown in the red](https://i.redd.it/4ckd48c3nfz71.jpg)
For this synthesis reaction, for the formation of alkene, how do we know that the pi bond is not placed on the other C-C in the ring as shown in the red
![Organic dye-catalyzed radical ring expansion reaction - RSC Advances (RSC Publishing) DOI:10.1039/C8RA02383B Organic dye-catalyzed radical ring expansion reaction - RSC Advances (RSC Publishing) DOI:10.1039/C8RA02383B](https://pubs.rsc.org/image/article/2018/RA/c8ra02383b/c8ra02383b-s1_hi-res.gif)
Organic dye-catalyzed radical ring expansion reaction - RSC Advances (RSC Publishing) DOI:10.1039/C8RA02383B
![BJOC - Hybrid macrocycle formation and spiro annulation on cis-syn-cis-tricyclo[6.3.0.02,6]undeca-3,11-dione and its congeners via ring-closing metathesis BJOC - Hybrid macrocycle formation and spiro annulation on cis-syn-cis-tricyclo[6.3.0.02,6]undeca-3,11-dione and its congeners via ring-closing metathesis](https://www.beilstein-journals.org/bjoc/content/figures/1860-5397-11-126-share.png)