Table 1.

Percentage yields of the n-phenyl–n-alkyl ureas of for pure, protected and de-protected amine.

Amine	n	Percentage Yield (%)
		Non-Protected	Protected	De-Protected
Propylamine	1	95	28	85
Hexylamine	4	85	20	80
Decylamine	8	91	38	93
Octadecylamine	16	90	69	72