Technical Notes:

1.Direct transformation of terminal alkynes to branched allylic sulfones.

2.Novel palladium-catalyzed intramolecular addition of aryl bromides to aldehydes as a key to the synthesis of 3,3-dimethylchroman-4-ones and 3,3-dimethylchroman-4-ols.

3.Ligand for Rh-Catalyzed Asymmetric Hydroalkynylation of Enamides.

References: 1. J. Am. Chem. Soc., 2014, 136, 16124. 2. Chemistry Select, 2018, 3, 11333. 3.J. Am. Chem. Soc.2018, 140, 506- -514.