BY D. S. TARBELL, R. C. MALLATT AND JW WILSON Urethans, because of their favorable character- istics, are frequently used to identify alcohols and phenols. They are usually prepared by heating an alcohol or phenol in the absence of a cata1yst.l However, scattered statements indicate that this formation of urethans, particularly from phenols, is catalyzed not only by basesZ but by aluminum chloride3 and hydrogen ch1oride.l A general sur- vey of the effect of ...
![3-(5-bromopyridin-3-yl)-1-(2-propan-2-ylphenyl)-4,5,6,7-tetrahydro-2H-pyrazolo[3,4-b]azepine结构式](https://image.chemsrc.com/caspic/113/5037-73-0.png)