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1. [100.00%] Piperonal and Safrole from Vanillin and Eugenol - [www.rhodium.ws]
http://chemistry.mdma.ch/hiveboard/rhodium/methylenation.html - 26.6kb
 as an example: a search result about vanillin demethylation

 further information:
 Demethylation of Vanillin and Eugenol CycloKnight, Sciencemadness Discussion Board, 18.09.2018
 Protocatechuic aldehyde preparation by Vanillin demethylation Let's Chemistry, YouTube, 28.03.2020 [mp4]
Protocatechualdehyde methylenation. Photo-essay. CycloKnight, Sciencemadness Discussion Board, 30.01.2014 [html]
4-Allylcatechol Methylenation CycloKnight, Sciencemadness Discussion Board, 13.02.2019

 Transformation of Eugenol and Safrole into Hydroxychavicol, B. Arifin et al., Bogor Agricultural University, (2014)
 A Practical and Efficient Procedure for the Preparation of Hydroxychavicol by Demethylation of Eugenol, D. Sang et al., Jingchu University of Technology, (2016)
 Ethyl acetate as a co-solvent and sacrificial ester in the aluminum triiodide promoted chemoselective demethylation of methyl vanillate, J. Tian et al., Jingchu University of Tech., (2017)
 Cleavage of Catechol Monoalkyl Ethers by Aluminum Triiodide-Dimethyl Sulfoxide, D. Sang et al., Jingchu University of Technology, (2018)
 One Pot Cleavage of Aryl Alkyl Ethers by Aluminum and Iodine in Acetonitrile, J. Tian et al., Jingchu University of Technology, (2019) [pdf] [html (General prodedure)]

 Synthesis and impurity profiling of MDMA prepared from commonly available starting materials, R. Gallagher et al., University of Technology Sydney, (2007)