Methionic acid

AEyl chloride reacts with sodamide in Hquid ammonia to produce benzene when sodamide is in excess, hexadiene dimer is the principal product, with some trimer and tetramer (C24, six double bonds). AEylation at carbon atoms alpha to polar groups is used in the preparation of a-aEyl-substituted ketones and nittiles. Preparation of P-diketone derivatives, methionic acid derivatives, and malonic ester, cyanoacetic ester, and P-keto-ester derivatives, etc, involving substitution on an alpha carbon between two polar carbonyl groups, is particularly facEe. 

Until 1945 no anhydrides of xylitol or any other pentitol had been described. In that year a patent was granted to Grandel73 to make anhydrides of pentitols by heating them with a catalyst, followed by vacuum distillation. Xylitol on being heated with methionic acid followed by vacuum distillation gave monoanhydroxylitol and a dianhydro-(73) F. Grandel (to Alien Property Custodian), U. S. Pat. 2,375,915 (1945). 

Methanedisullonic acid Methionic acid CH40gS2 603-40-2 176.169 98 i HjO s HNO3... 

Methanedisulfonic acid Methionic acid CH4OBS2 503-40-2 176.169 98 IH,0 sHN03... 

Lauraldehyde, dimethyl acetal 3861 Mecrylate 7140 Methionic acid 6743... 

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