In 2022,Meng, Shuai; Hettiarachchi, Ishani Lakshika; Bhetuwal, Bishwa Raj; Thapa, Prakash; Zhu, Jianglong published an article in Journal of Organic Chemistry. The title of the article was 《Stereoselective Synthesis of β-D-Manno-heptopyranoside via Cs2CO3-Mediated Anomeric O-Alkylation: Synthesis of a Tetrasaccharide Repeating Unit of Bacillus thermoaerophilus Surface-Layer Glycoprotein》.Formula: C19H18BrP The author mentioned the following in the article:
Stereoselective synthesis of D-glycero- and L-glycero-β-D-mannoheptosides has been achieved by cesium carbonate-mediated β-selective anomeric O-alkylation of the corresponding D-mannoheptoses. In addition, this method has been utilized in the total synthesis of a tetrasaccharide repeat unit of Bacillus thermoaerophilus surface-layer glycoprotein. The results came from multiple reactions, including the reaction of Methyltriphenylphosphonium bromide(cas: 1779-49-3Formula: C19H18BrP)
Methyltriphenylphosphonium bromide(cas: 1779-49-3) is used for methylenation through the Wittig reaction. It is utilized in the synthesis of an enyne and 9-isopropenyl -phenanthrene by using sodium amide as reagent. Formula: C19H18BrP
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary