70685-45-9

Upstream product

• 100-52-7 benzaldehyde 
• 55043-21-5 (Z)-2-benzylidene-4-methyl-3,4-dihydro-3-oxo-2H-1,4-benzothiazine 
• 5325-20-2 2H-1,4-benzothiazin-3-one 
• 87833-87-2 Acetic acid 2-(acetoxy-phenyl-methyl)-4-methyl-3-oxo-3,4-dihydro-2H-benzo[1,4]thiazin-2-yl ester 
• 108-24-7 acetic anhydride 

Relevant academic research and scientific papers

A Simple Ring-expansion of 1,4-Benzothiazines to give 1,5-Benzothiazepines

A new ring-expansion of 2-phenylmethylene-2H-1,4-benzothiazin-3(4H)-ones (1) to give 2,3-dihydro-3-oxo-2-phenyl-1,5-benzothiazepin-4(5H)-ones (3) has been developed; an episulphonium ion intermediate could be involved.