PRECIPITANT S FOR FURFURAL 



TABLE V. 

 THIOBARBITURIC ACID. 



47 



Here again, the results are just a trifle in excess of the theory. 

 Even so small an amount of furfural as 12 mgms. gave practi- 

 cally a quantitative yield, and variations in the amount of pre- 

 cipitant were of very little influence. 



Analysis of the condensation products showed the percentage 

 of nitrogen to be in close agreement with the values calculated 

 from the formulas. 



TABLE VI. 



ANALYSIS OF CONDENSATION PRODUCTS. 



The furfuralmalonylurea is a bright lemon yellow, somewhat 

 granular precipitate which settles readily. Furfuralmalonyl- 

 thiourea is also a brilliant lemon yellow precipitate but very 

 floceulent and voluminous. No difficulty was experienced in 

 filtering and washing it, although the filtration was somewhat 



