New sterically-hindered catechols/o-benzoquinones. Reduction of 4,6-di-tert-butyl-2,3-dihydroxybenzaldehyde
摘要:
Reduction of aldehyde group in 4,6-di-tert-buty1-2,3-dihydroxybenzaldehyde leads to methoxymethyl (NaBH4, MeOH) or methyl (Zn, MeOH) analogues, which were further oxidized into the corresponding o-benzoquinones. Their photostability in benzene increases substantially on replacement of the 6-positioned Me substituent with the CH2OMe group.
[EN] RED THERMOCHROMIC DYES AND THEIR INK COMPOSITIONS<br/>[FR] COLORANTS THERMOCHROMIQUES ROUGES ET COMPOSITIONS D'ENCRE CORRESPONDANTES
申请人:CHROMATIC TECH INC
公开号:WO2015048536A1
公开(公告)日:2015-04-02
A red leuco dye demonstrates unusually good thermal and photo stability. The red dye may be used with developers and wax carries for microencapsulation to form thermochromic pigments for use in inks, coatings and the like. This pigment is particularly desirable for use in metal-deco coatings, such as those used in aluminum cans in high beverage canning operations.
An efficient metal-free synthesis strategy of benzoxazoles was developed via coupling catechols, ammonium acetate, and alkenes/alkynes/ketones. The developed methodology represents an operationally simple, one-pot and large-scaleprocedure for the preparation of benzoxazole derivatives using molecular iodine as the catalyst.