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ChemInform Abstract: Facile Sulfur-Assisted Carbonylation of Diaminoresorcinol with Carbon Monoxide.

✍ Scribed by Takumi Mizuno; Takeo Nakai; Masatoshi Mihara; Takatoshi Ito

Book ID
112043984
Publisher
John Wiley and Sons
Year
2012
Weight
30 KB
Volume
43
Category
Article
ISSN
0931-7597

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Facile sulfur-assisted carbonylation of
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## Abstract 4,6‐Diaminoresorcinol, which is a raw material of ZYLON (PBO fiber), has an instability in air atmosphere. Therefore, very stable benzo[1,2‐d:5,4‐d']bis‐2(3H)‐oxazolone recognized a useful equivalent of 4,6‐diaminoresorcinol during the stages of production, storage, and transportation.

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2,4-Dioxo-l,2,3,4-tetrahydroquinazoIines were easily synthesized in excellent yields by sulfur-assisted carbonylation of'2'-aminobenzamides with carbon monoxide in the presence o f a base, such as DBU or DBN.