70310-33-7

Upstream product

• 70-11-1 α-bromoacetophenone 
• 95-84-1 3-amino-4-hydroxytoluene 
• 98-86-2 acetophenone 
• 70310-27-9 6-methyl-3-phenyl-2H-benzo[b][1,4]oxazine 
• 70310-22-4 2-(4-methyl-2-nitro-phenoxy)-1-phenyl-ethanone 

Relevant academic research and scientific papers

Method for preparing 3,4-dihydrobenzo[b][1,4]oxazine derivatives

The invention provides a method for preparing 3,4-dihydrobenzo[b][1,4]oxazine derivatives. The method comprises the following step: carrying out reduction reaction on [b][1,4]oxazines in the presence of hydrogen gas by using B(C6F5)3 as a catalyst to obtain the mixture containing the 3,4-dihydrobenzo[b][1,4]oxazines disclosed as Formula I. Benzo[b][1,4]oxazines in different structures are used as a substrate to synthesize the benzo[b][1,4]oxazines at high yield by using the B(C6F5)3 as the catalyst. The method has the advantages of cheap and accessible raw materials, high reaction activity, no participation of transition metals and wide substrate application range, and has huge industrialization potential.

A metal-free hydrogenation of 3-substituted 2H-1,4-benzoxazines

A metal-free hydrogenation of 3-substituted 2H-1,4-benzoxazines has been successfully realized with 2.5 mol% of B(C6F5)3 as a catalyst to furnish a variety of 3,4-dihydro-2H-1,4-benzoxazines in 93-99% yields. Up to 42% ee was also achieved for the asymmetric hydrogenation with the use of a chiral diene and HB(C6F5)2.

Cationic dyes

There are described novel greenish-yellow cationic dyes of the formula STR1 wherein R1 is hydrogen, halogen, lower alkyl, lower alkoxy or NO2, R2 is unsubstituted lower alkyl, or lower alkyl which is substituted by: hydroxyl, lower alkoxy, halogen, CN, carboxylic acid amide, carboxylic acid alkyl ester or phenyl, or R2 is alkenyl (C3 -C4), the R3 's independently of one another are each lower alkyl, or both R3 's together form a carbocyclic 5-, 6- or 7-membered ring, R4 is hydrogen, lower alkyl, unsubstituted aryl or substituted aryl, R5, R6 and R7 independently of one another are hydrogen, lower alkyl, lower alkoxy, halogen, NO2, CN or lower alkylsulfonyl, and A is an anion; processes for producing them, and their use for dyeing and printing textile materials, particularly polyacrylonitrile materials.